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Vegetarianism



 
 
Vegetarianism is the practice of a diet that excludes meat
Meat

In modern English usage, meat most often refers to animal biological tissue used as food, mostly skeletal muscle and associated fat, but it may also refer to offal, including livers, skin, brains, bone marrow, kidneys, in some countries lungs, and a variety of other internal organs as well as blood....
 (including game
Game (food)

Game is any animal hunting for food or not normally Domestication . Game animals are also hunted for sport.The type and range of animals hunted for food varies in different parts of the world....
 and slaughter by-products), fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
 (including shellfish
Shellfish

Shellfish is a culinary and fisheries term for exoskeleton bearing aquatic invertebrate used as food, including various species of Molluscas, crustaceans, and echinoderms....
 and other sea animals) and poultry
Poultry

Poultry is the category of domesticated birds which some people keep for the purpose of collecting their egg , or kill for their meat and/or feathers....
. There are several variants of the diet, some of which also exclude eggs
Egg (food)

An egg is a round or oval body laid by the female of many animals, consisting of an ovum surrounded by layers of membranes and an outer casing, which acts to nourish and protect a developing embryo and its nutrient reserves....
 and/or some products produced from animal labour such as dairy product
Dairy product

Dairy products are generally defined as foodstuffs produced from milk. They are usually high-energy-yielding food products. A production plant for such processing is called a dairy or a dairy factory....
s and honey
Honey

Honey is a sweet fluid produced by honey bees , and derived from the nectar of flowers. According to the United States National Honey Board and various international food regulations, "honey stipulates a pure product that does not allow for the addition of any other substance?this includes, but is not limited to, water or other sweeteners...
.

The vegan
Veganism

Veganism is a diet and lifestyle that seeks to exclude the use of animals for food, clothing, or any other purpose. Vegans endeavor not to use or consume animal products of any kind....
 diet is a form of vegetarianism which excludes all animal product
Animal product

Animal products are either produced by an animal or taken from the body of an animal. The term is primarily used in relation to Diet , particularly for Vegetarianism, Veganism and those concerned with maintaining a Kashrut, Halaal, or raw food diet diet....
s from the diet, such as meat, poultry, fish, dairy products, eggs, and honey.






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Quotations


All wholsom food is caught without a net or a trap.

William Blake, on The Marriage of Heaven and Hell

Behold the venus flytrap, the complete answer to the philospohy of vegetarianism.

Tom Edwards

Go veg—for animals, for your health, for life.

Masta Killa from Wu-Tang Clan, from the pro-vegetarian add he did for PETA

I'm a postmodern vegetarian - I eat meat ironically.

Bill Bailey (Part Troll)

Vegetarian: old Indian word for bad hunter. - Bumper sticker

Animals and humans suffer and die alike. Violence causes the same pain, the same spilling of blood, the same stench of death, the same arrogant, cruel, and brutal taking of life. -






Encyclopedia


Vegetarianism is the practice of a diet that excludes meat
Meat

In modern English usage, meat most often refers to animal biological tissue used as food, mostly skeletal muscle and associated fat, but it may also refer to offal, including livers, skin, brains, bone marrow, kidneys, in some countries lungs, and a variety of other internal organs as well as blood....
 (including game
Game (food)

Game is any animal hunting for food or not normally Domestication . Game animals are also hunted for sport.The type and range of animals hunted for food varies in different parts of the world....
 and slaughter by-products), fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
 (including shellfish
Shellfish

Shellfish is a culinary and fisheries term for exoskeleton bearing aquatic invertebrate used as food, including various species of Molluscas, crustaceans, and echinoderms....
 and other sea animals) and poultry
Poultry

Poultry is the category of domesticated birds which some people keep for the purpose of collecting their egg , or kill for their meat and/or feathers....
. There are several variants of the diet, some of which also exclude eggs
Egg (food)

An egg is a round or oval body laid by the female of many animals, consisting of an ovum surrounded by layers of membranes and an outer casing, which acts to nourish and protect a developing embryo and its nutrient reserves....
 and/or some products produced from animal labour such as dairy product
Dairy product

Dairy products are generally defined as foodstuffs produced from milk. They are usually high-energy-yielding food products. A production plant for such processing is called a dairy or a dairy factory....
s and honey
Honey

Honey is a sweet fluid produced by honey bees , and derived from the nectar of flowers. According to the United States National Honey Board and various international food regulations, "honey stipulates a pure product that does not allow for the addition of any other substance?this includes, but is not limited to, water or other sweeteners...
.

The vegan
Veganism

Veganism is a diet and lifestyle that seeks to exclude the use of animals for food, clothing, or any other purpose. Vegans endeavor not to use or consume animal products of any kind....
 diet is a form of vegetarianism which excludes all animal product
Animal product

Animal products are either produced by an animal or taken from the body of an animal. The term is primarily used in relation to Diet , particularly for Vegetarianism, Veganism and those concerned with maintaining a Kashrut, Halaal, or raw food diet diet....
s from the diet, such as meat, poultry, fish, dairy products, eggs, and honey. Those who practice veganism for ethical reasons often exclude animal products from their diet as part of a larger practice of abstaining from the use of animals for any purpose (e.g. leather, fur, etc.), often out of support for animal rights
Animal rights

Animal rights, also known as animal liberation, is the idea that the most basic interests of animals should be afforded the same consideration as the similar interests of human beings....
.

Most vegetarians consume dairy products, and many eat eggs. Lacto-vegetarianism includes dairy products but excludes eggs, ovo-vegetarianism
Ovo vegetarianism

Ovo vegetarians are Vegetarianism who eat eggs but not meat or dairy products. "Ovo" comes from the Latin word for egg .This vegetarian diet excludes dairy products....
 includes eggs but not dairy, and lacto-ovo vegetarianism
Lacto-ovo vegetarianism

A lacto-ovo-vegetarian is a vegetarianism who does not eat beef, pork, poultry, fish, shellfish or animal flesh of any kind, but is willing to consume dairy products and Egg ....
 includes both eggs and dairy products.

Semi-vegetarianism
Semi-vegetarianism

Semi-vegetarianism is a term used to describe the practice of excluding some meat from the diet while still consuming limited amounts of poultry, fish, and/or seafood....
 consists of a diet largely of vegetarian foods, but may include fish and sometimes even poultry, as well as dairy products and eggs. The association of semi-vegetarianism with vegetarianism in popular vernacular, particularly pescetarianism
Pescetarianism

Pescetarianism is a diet choice in which a person, known as a pescetarian, eats any combination of vegetables, fruit, Nut , beans and fish or seafood, but will not eat mammals or birds....
 (also called pesco-vegetarianism and described as a "vegetarian" diet that includes fish has the same definition. ), has led to what vegetarian groups cite as improper categorisation of these diets as vegetarian. The Vegetarian Society
Vegetarian Society

The Vegetarian Society is a United Kingdom registered charitable organization established on 30 September 1847 with the aim of promoting understanding and respect for vegetarianism lifestyles....
, which initiated popular usage of the term vegetarian as early as 1847, condemns the association of semi-vegetarian diets as valid vegetarianism; the organisation points out that the consumption of fish is not vegetarian.

The reasons for choosing vegetarianism may be related to morality, religion, culture, ethics, aesthetics, environment, society, economy, politics, taste, or health. A generic term for both vegetarianism and veganism, as well as for similar diets, is "plant-based diets". Properly planned vegetarian diets have been found to satisfy the nutritional needs for all stages of life, and large-scale studies have shown vegetarianism to significantly lower risks of cancer, ischaemic heart disease
Ischaemic heart disease

Ischaemic or ischemic heart disease , or myocardial ischaemia, is a disease characterized by reduced blood supply to the myocardium, usually due to Coronary heart disease ....
, and other diseases.

Terminology and varieties of vegetarianism

Foods in the main vegetarian diets
Diet name Meat
Meat

In modern English usage, meat most often refers to animal biological tissue used as food, mostly skeletal muscle and associated fat, but it may also refer to offal, including livers, skin, brains, bone marrow, kidneys, in some countries lungs, and a variety of other internal organs as well as blood....
, poultry
Poultry

Poultry is the category of domesticated birds which some people keep for the purpose of collecting their egg , or kill for their meat and/or feathers....
, fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
 
Eggs
Egg (food)

An egg is a round or oval body laid by the female of many animals, consisting of an ovum surrounded by layers of membranes and an outer casing, which acts to nourish and protect a developing embryo and its nutrient reserves....
 
Dairy
Dairy

A dairy is a facility for the extraction and processing of animal milk—mostly from goat or cattle, but also from bovine, sheep, horses or camels —for human consumption....
 
Honey
Honey

Honey is a sweet fluid produced by honey bees , and derived from the nectar of flowers. According to the United States National Honey Board and various international food regulations, "honey stipulates a pure product that does not allow for the addition of any other substance?this includes, but is not limited to, water or other sweeteners...
Lacto-ovo vegetarianism
Lacto-ovo vegetarianism

A lacto-ovo-vegetarian is a vegetarianism who does not eat beef, pork, poultry, fish, shellfish or animal flesh of any kind, but is willing to consume dairy products and Egg ....
No
YesYesYes
Lacto vegetarianism
Lacto vegetarianism

A lactovegetarian diet is a vegetarianism diet which includes dairy products such as milk, cheese, yogurt, butter, cream, and kefir but excludes eggs....
No
NoYesYes
Ovo vegetarianism
Ovo vegetarianism

Ovo vegetarians are Vegetarianism who eat eggs but not meat or dairy products. "Ovo" comes from the Latin word for egg .This vegetarian diet excludes dairy products....
No
YesNoYes
Veganism
Veganism

Veganism is a diet and lifestyle that seeks to exclude the use of animals for food, clothing, or any other purpose. Vegans endeavor not to use or consume animal products of any kind....
No
NoNoNo


Other dietary practices commonly associated with vegetarianism

  • Fruitarianism
    Fruitarianism

    Fruitarians eat in principle only the fruit of plants.Some people consider themselves fruitarians even if their diet is not 100% fruit. Usually fruitarians who include foods other than fruit follow a vegan diet....
     is a diet of only fruit, nuts, seeds, and other plant matter that can be gathered without harming the plant.
  • Su vegetarianism originating in Buddhism
    Buddhism

    Buddhism is a family of beliefs and practices considered by most to be a religionand is based on the teachings attributed to Siddhartha Gautama, commonly known as "The Buddha" , who was born in what is today Nepal....
    , excludes all animal products as well as the fetid vegetables: onion
    Onion

    Onion is a term used for many plants in the genus Allium. They are known by the common name "onion" but, used without qualifiers, it usually refers to Allium cepa....
    , garlic
    Garlic

    Allium sativum L., commonly known as garlic, is a species in the onion family Alliaceae. Its close relatives include the onion, shallot, leek, and chive....
    , scallion
    Scallion

    A scallion, also commonly known as spring onion, green onion, or salad onion, is associated with various members of the genus Allium that lack a fully-developed bulb....
    s, leek
    Leek

    The leek, Allium ampeloprasum var. porrum , also sometimes known as Allium porrum, is a vegetable which belongs, along with the onion and garlic, to the Alliaceae family....
    s, or shallot
    Shallot

    The term shallot is used to describe two different Allium species of plant. The French grey challot or griselle, which has been considered to be the ?true shallot? by many, is Allium oschaninii, a species that grows wild from Central Asia to Southwest Asia....
    s.
  • Macrobiotic diet
    Macrobiotic diet

    A macrobiotic diet , from the Greek language "macro" and "bios" , is a diet that involves eating Cereal as a staple food supplemented with other foodstuffs such as vegetables and beans, and avoiding the use of highly processed or refined foods....
     is a diet of mostly whole grain
    Whole grain

    Whole grains are cereal that contain bran and cereal germ as well as the endosperm, in contrast to refined grains, which retain only the endosperm....
    s and bean
    Bean

    Bean is a common name for large plant seeds of several genus of the Family Fabaceae used for human food or animal feed.The whole young pods of bean plants, if picked before the pods ripen and dry, can be tender enough to eat whole, whether cooked or raw....
    s. Not all macrobiotics are vegetarians, as some consume fish
    Fish

    A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
    .
  • Raw veganism
    Raw veganism

    Raw veganism is a diet which combines veganism and raw foodism. It excludes all food of animal origin, and all food cooked above 48 degrees Celsius ....
     is a diet of fresh and uncooked fruit, nuts, seeds, and vegetables.
  • Dietary veganism
    Veganism

    Veganism is a diet and lifestyle that seeks to exclude the use of animals for food, clothing, or any other purpose. Vegans endeavor not to use or consume animal products of any kind....
    : whereas vegans do not use animal products of any kind, dietary vegans restrict their veganism to their diet.


Some vegetarians also avoid products that may use animal ingredients not included in their labels or which use animal products in their manufacturing i.e. cheeses that use animal rennet
Rennet

Rennet is a natural complex of enzymes produced in any mammalian stomach to digest the mother's milk, and is often used in the production of cheese....
, gelatin
Gelatin

Gelatin is a translucent, colorless, brittle, nearly tasteless solid, derived from the collagen inside animals' skin and mostly bones. It has been commonly used as a gelling agent in food, pharmaceutical, photography, and cosmetic manufacturing....
 (from animal skin, bones, and connective tissue
Connective tissue

Connective tissue is a form of fibrous biological tissue.It is one of the four types of tissue in traditional classifications .Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals, making up about 25% of the total protein content....
), some sugars that are whitened with bone char
Bone char

Bone char, also known as bone black or animal charcoal, is a granular material produced by charring animal bones: the bones are heated to high temperatures in an oxygen-depleted atmosphere to control the quality of the product as related to its adsorption capacity for applications such as defluoridation of water and removal of he...
 (e.g. cane
Sugarcane

Sugarcane is a genus of 6 to 37 species of tall perennial plant Poaceae , native to warm temperate to tropical regions of the Old World. They have stout, jointed, fibrous stalks that are rich in sugar and measure 2 to 6 meters tall....
 sugar, but not beet
Sugar beet

Sugar beet , a member of the Chenopodiaceae family, is a plant whose root contains a high concentration of sucrose. It is grown commercially for sugar production....
 sugar) and alcohol
Alcoholic beverage

An alcoholic beverage is a drink containing ethanol . Alcoholic beverages are divided into three general classes: beers, wines, and distilled beverage....
 clarified with gelatin
Gelatin

Gelatin is a translucent, colorless, brittle, nearly tasteless solid, derived from the collagen inside animals' skin and mostly bones. It has been commonly used as a gelling agent in food, pharmaceutical, photography, and cosmetic manufacturing....
 or crushed shellfish
Shellfish

Shellfish is a culinary and fisheries term for exoskeleton bearing aquatic invertebrate used as food, including various species of Molluscas, crustaceans, and echinoderms....
 and sturgeon
Sturgeon

Sturgeon is the common name used for some 26 species of fish in the family Acipenseridae, including the genus Acipenser, Huso, Scaphirhynchus and Pseudoscaphirhynchus....
. Vegetarians who eat eggs sometimes prefer free-range eggs (as opposed to battery farmed eggs) on moral grounds.

Semi-vegetarian diets

Semi-vegetarian diets are diets that primarily consist of vegetarian foods, but make exceptions for some non-vegetarian foods. These diets may be followed by those who choose to reduce the amount of animal flesh consumed, or sometimes as a way of transitioning to a vegetarian diet. These terms are neologism
Neologism

A neologism is a newly coined word that may be in the process of entering common use, but has not yet been accepted into mainstream language . Neologisms are often directly attributable to a specific person, publication, period, or event....
s based on the word "vegetarian". They may be regarded with contention by some strict vegetarians, as they combine terms for vegetarian and non-vegetarian diets.

Additionally, many individuals describe themselves as simply "vegetarian" while actually practicing a semi-vegetarian diet.
  • Semi-vegetarianism
    Semi-vegetarianism

    Semi-vegetarianism is a term used to describe the practice of excluding some meat from the diet while still consuming limited amounts of poultry, fish, and/or seafood....
    —A diet that excludes certain meats, particularly red meat
    Red Meat

    Begun in 1989, Max Cannon's Red Meat is an independent comic strip. It appears in over 75 alternative weeklies and college papers in the United States and in other countries....
    , but allows the consumption of others.
    • Pescetarianism
      Pescetarianism

      Pescetarianism is a diet choice in which a person, known as a pescetarian, eats any combination of vegetables, fruit, Nut , beans and fish or seafood, but will not eat mammals or birds....
      —A diet that excludes all meat except fish
      Fish

      A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
      , shellfish
      Shellfish

      Shellfish is a culinary and fisheries term for exoskeleton bearing aquatic invertebrate used as food, including various species of Molluscas, crustaceans, and echinoderms....
      , and crustacea.
    • Pollotarianism—A diet that excludes all meat except poultry
      Poultry

      Poultry is the category of domesticated birds which some people keep for the purpose of collecting their egg , or kill for their meat and/or feathers....
       and fowl
      Fowl

      Fowl is a term for birds; fowl belong to one of two order , namely the gamefowl or landfowl and the waterfowl . Studies of anatomical and molecular similarities suggest these two groups were close evolutionary relatives; together, they form the fowl clade which is scientifically known as Galloanserae ....
      .
  • Flexitarianism
    Flexitarianism

    Flexitarianism is a semi-vegetarianism diet focusing on vegetarian cuisine with occasional meat consumption. A self-described flexitarian seeks to decrease meat consumption without eliminating it entirely from his or her diet....
    —A diet that consists primarily of vegetarian food, but that allows occasional exceptions.


Etymology

The Vegetarian Society
Vegetarian Society

The Vegetarian Society is a United Kingdom registered charitable organization established on 30 September 1847 with the aim of promoting understanding and respect for vegetarianism lifestyles....
, founded in 1847, claims to have "created the word vegetarian from the Latin 'vegetus' meaning 'lively' (which is how these early vegetarians claimed their diet made them feel) ..." However, the Oxford English Dictionary
Oxford English Dictionary

The Oxford English Dictionary , published by the Oxford University Press , is a comprehensive dictionary of the English language. Two fully-bound print editions of the OED have been published under its current name, in 1928 and 1989; as of December 2008 the dictionary's current editors have completed a quarter of the third edition....
 and other standard dictionaries state that the word was formed from the term "vegetable" and the suffix "-arian".

The Oxford English Dictionary also gives evidence that the word was already in use before the foundation of the Vegetarian Society:
  • 1839 - "If I had had to be my own cook, I should inevitably become a vegetarian." (F. A. Kemble, Jrnl. Residence on Georgian Plantation (1863) 251)
  • 1842 - "To tell a healthy vegetarian that his diet is very uncongenial with the wants of his nature." (Healthian, Apr. 34)


But notes that "The general use of the word appears to have been largely due to the formation of the Vegetarian Society at Ramsgate in 1847."

History

The earliest records of vegetarianism as a concept and practice amongst a significant number of people come from ancient India
India

India, officially the Republic of India , is a country in South Asia. It is the List of countries and outlying territories by total area country by geographical area, the List of countries by population country, and the most populous liberal democracy in the world....
 and the ancient Greek civilisation in Southern Italy and in Greece in the 6th century BCE. In both instances the diet was closely connected with the idea of nonviolence
Nonviolence

Nonviolence is a philosophy and strategy for social change that rejects the use of physical violence. As such, nonviolence is an alternative to passive acceptance of oppression and armed struggle against it....
 towards animals (called ahimsa
Ahimsa

Ahimsa is a Sanskrit term meaning to do no harm . It is an important tenet of the religions that originated in ancient India . Ahimsa is a rule of conduct that bars the killing or injuring of living beings....
 in India) and was promoted by religious groups and philosophers. Following the Christianisation of the Roman Empire in late antiquity, vegetarianism practically disappeared from Europe. Several orders of monks
Monks

Monks may refer to:*Plural of monk* Robert Monks -- American entrepreneur, politician, and corporate activist* "Monks " -- a character from Charles Dickens' Oliver Twist...
 in medieval Europe restricted or banned the consumption of meat for ascetic
Asceticism

Asceticism describes a life-style characterized by abstinence from various sorts of worldly pleasures often with the aim of pursuing religious and spirituality goals....
 reasons, but none of them eschewed fish. Vegetarianism re-emerged somewhat in Europe during the Renaissance
Renaissance

The Renaissance was a cultural movement that spanned roughly the 14th to the 17th century, beginning in Italy in the late Middle Ages and later spreading to the rest of Europe....
. It became a more widespread practice in the 19th and 20th centuries.

In 1847 the first Vegetarian Society was founded in England
England

native_name =|conventional_long_name = England|common_name = England|image_flag = Flag of England.svg|image_coat = England COA.svg|symbol_type = Royal Coat of Arms...
; Germany
Germany

Germany , officially the Federal Republic of Germany , is a country in Central Europe. It is bordered to the north by the North Sea, Denmark, and the Baltic Sea; to the east by Poland and the Czech Republic; to the south by Austria and Switzerland; and to the west by France, Luxembourg, Belgium, and the Netherlands....
, the Netherlands and other countries followed. The International Vegetarian Union
International Vegetarian Union

The International Vegetarian Union was founded in 1908 when the first World Vegetarian Congress was held in Dresden, Germany. The idea for IVU came from the French Vegetarian Society, the first Congress was organized internationally by the British Society and locally by the Dresden Society with support from the Deutsche Vegetarier-Bund....
, a union of the national societies, was founded in 1908. In the Western world
Western world

The term Western world, the West or the Occident can have multiple meanings dependent on its context . Accordingly, the basic definition of what constitutes "the West" varies, expanding and contracting over time, in relation to various historical circumstances....
, the popularity of vegetarianism grew during the 20th century as a result of nutritional, ethical, and more recently, environmental
Environmental movement

The environmental movement, a term that includes the conservation movement and green movement movements, is a diverse scientific, social, and political movement for addressing environmental issues....
 and economic concerns. Today, Indian vegetarians, primarily lacto vegetarians
Lacto vegetarianism

A lactovegetarian diet is a vegetarianism diet which includes dairy products such as milk, cheese, yogurt, butter, cream, and kefir but excludes eggs....
, are estimated to make up more than 70% of the world's vegetarians. They make up 20–42% of the population in India, while less than 30% are regular meat-eaters.

Other estimates indicate that contrary to popular belief, India is not a predominantly vegetarian country. But a quarter of the population is reckoned, based on census data, to be vegetarian. The statewise data is as follows: 69 per cent of Gujarat, 60 per cent of Rajasthan, 54 per cent of Punjab-Haryana, 50 per cent of Uttar Pradesh, 45 per cent of Madhya Pradesh, 34 per cent of Karnataka, 30 per cent of Maharashtra, 21 per cent of Tamil Nadu, 16 per cent of Andhra Pradesh, 15 per cent of Assam, 6 per cent in Kerala, Orissa and West Bengal

Surveys in the U.S. have found that roughly 1–2.8% of adults eat no meat (including poultry or fish).

Health benefits and concerns

Vegetarianism is considered a healthy, viable diet. The American Dietetic Association
American Dietetic Association

The American Dietetic Association is the United States' largest organization of food and nutrition professionals, with nearly 67,000 members. Approximately 75 % of ADA's members are Dietitian and about 4 % are dietetic technicians, registered....
 and the Dietitians of Canada
Dietitians of Canada

Dietitians of Canada is the professional organization of dietitians in Canada. It has over 5,000 members. The organization is also the accreditation body for undergraduate nutrition/dietetic programs in the country....
 have found a properly-planned vegetarian diet to satisfy the nutritional needs for all stages of life, and large-scale studies have shown vegetarianism to significantly lower risks of cancer, ischaemic heart disease, and other fatal diseases. Necessary nutrients, proteins, and amino acids for the body's sustenance can be found in vegetables, grains, nuts, soymilk, eggs and dairy.

Vegetarian diets can aid in keeping body weight under control and substantially reduce risks of heart disease and osteoporosis
Osteoporosis

Osteoporosis is a disease of bone that leads to an increased risk of bone fracture. In osteoporosis the bone mineral density is reduced, bone microarchitecture is disrupted, and the amount and variety of collagen proteins in bone is altered....
. Non-lean red meat, in particular, has been found to be directly associated with dramatically increased risk of cancers of the lung
Lung cancer

Lung cancer is a disease of uncontrolled cell growth in tissue of the lung. This growth may lead to metastasis, which is the invasion of adjacent tissue and infiltration beyond the lungs....
, oesophagus, liver, and colon. Other studies have shown that there were no significant differences between vegetarians and nonvegetarians in mortality from cerebrovascular disease, stomach cancer, colorectal cancer, breast cancer, or prostate cancer, although the sample of vegetarians was small and included ex-smokers who had switched their diet within the last five years.

The American Dietetic Association and Dietitians of Canada have stated: "Vegetarian diets offer a number of nutritional benefits, including lower levels of saturated fat
Saturated fat

Saturated fat is fat that consists of triglycerides containing only Saturation fatty acid radicals. There are several kinds of naturally occurring saturated fatty acids, which differ by the number of carbon atoms - from 1 to 24....
, cholesterol
Cholesterol

Cholesterol is a lipidic, waxy alcohol found in the cell membranes and transported in the blood plasma of all animals. It is an essential component of mammalian cell membranes where it is required to establish proper membrane permeability and membrane fluidity....
, and animal protein as well as higher levels of carbohydrates, fiber
Fiber

Fiber or fibre is a class of materials that are continuous filaments or are in discrete elongated pieces, similar to lengths of yarn. They are very important in the biology of both plants and animals, for holding tissue s together....
, magnesium
Magnesium

Magnesium is a chemical element with the symbol Mg, atomic number 12, atomic weight 24.3050 and common oxidation number +2.Magnesium, an alkaline earth metal, is the ninth most abundance of the chemical elements in the universe by mass....
, potassium
Potassium

Potassium is a chemical element. It has the symbol K , atomic number 19, and atomic mass 39.0983. Potassium was first isolated from potash, hence the name....
, folate, and antioxidants such as vitamins C and E and phytochemicals." Vegetarians tend to have lower body mass index
Body mass index

The body mass index , or Quetelet index, is a statistical measurement which compares a person's weight and height. Though it does not actually measure the Body fat percentage, it is a useful tool to estimate a healthy body weight based on how tall a person is....
, lower levels of cholesterol
Cholesterol

Cholesterol is a lipidic, waxy alcohol found in the cell membranes and transported in the blood plasma of all animals. It is an essential component of mammalian cell membranes where it is required to establish proper membrane permeability and membrane fluidity....
, lower blood pressure
Blood pressure

Blood pressure is the pressure exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. The pressure of the circulating blood decreases as it moves away from the heart through artery and capillary, and toward the heart through veins....
, and less incidence of heart disease
Heart disease

Heart disease is an umbrella term for a variety for different diseases affecting the heart. As of 2007, it is the leading cause of death in the United States, England, Canada and Wales, killing one person every 34 seconds in the United States alone....
, hypertension
Hypertension

Hypertension, also referred to as high blood pressure, HTN or HPN, is a medical condition in which the blood pressure is chronically elevated....
, type 2 diabetes, renal disease, osteoporosis
Osteoporosis

Osteoporosis is a disease of bone that leads to an increased risk of bone fracture. In osteoporosis the bone mineral density is reduced, bone microarchitecture is disrupted, and the amount and variety of collagen proteins in bone is altered....
, dementia
Dementia

Dementia is the progressive decline in cognition due to damage or disease in the body beyond what might be expected from normal aging. Although dementia is far more common in the geriatric population, it may occur in any stage of adulthood....
s such as Alzheimer’s Disease and other disorders.

Nutrition

]]

Western vegetarian diets are typically high in carotenoids, but relatively low in long-chain n-3 fatty acids, and vitamin B12
Vitamin B12

Vitamin B12 is a water soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood....
. Vegans can have particularly low intake of vitamin B and calcium
Calcium

Calcium is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft grey alkaline earth metal, and is the fifth most abundant element by mass in the earth's Crust ....
 if they do not eat enough items such as collard greens, leafy greens, tempeh and tofu. High levels of dietary fibre, folic acid, vitamins C and E, and magnesium, and low consumption of saturated fat could all be beneficial aspects of a vegetarian diet.

Protein
Protein intake in vegetarian diets is only slightly lower than in meat diets and can meet daily requirements for any person, including athletes and bodybuilders. Studies by Harvard University as well as other studies conducted in the United States, Great Britain, Canada, Australia, New Zealand and various European countries, have confirmed that vegetarian diets provide more than sufficient protein intake as long as a variety of plant sources are available and consumed. Proteins are composed of amino acids, and a common concern with protein acquired from vegetable sources is an adequate intake of the "essential amino acids", which cannot be synthesised by the human body. While dairy and egg products provide complete sources for lacto-ovo vegetarians, the only vegetable sources with significant amounts of all eight types of essential amino acids are lupin
Lupin

Lupin, often spelled lupine in North America, is the common name for members of the genus Lupinus in the legume family . The genus comprises between 200-600 species, with major centers of diversity in South America and western North America - ) and - in the Mediterranean region and Africa....
, soy, hempseed, chia seed, amaranth
Amaranth grain

Amaranth has been cultivated as a grain for 6th millennium BC. The yield of grain amaranth is comparable to rice or maize. It was a staple food of the Aztecs, and was used as an integral part of Aztec religious ceremonies....
, buckwheat
Buckwheat

Buckwheat refers to plants in two genera of the dicot family Polygonaceae: the Eurasian genus Fagopyrum, and the North American genus Eriogonum....
, and quinoa
Quinoa

Quinoa is a species of goosefoot grown as a agriculture primarily for its edible seeds. It is a pseudocereal rather than a true cereal as it is not a Poaceae....
. It is not necessary, however, to obtain protein from these sources—the essential amino acids can also be obtained by eating a variety of complementary plant sources that, in combination, provide all eight essential amino acids (e.g. brown rice
Brown rice

Brown rice is Huller or partly milled rice, a kind of whole grain, a natural grain that remains unbleached. It has a mild nutty flavor, is chewier than white rice and becomes rancidification more quickly....
 and bean
Bean

Bean is a common name for large plant seeds of several genus of the Family Fabaceae used for human food or animal feed.The whole young pods of bean plants, if picked before the pods ripen and dry, can be tender enough to eat whole, whether cooked or raw....
s, or hummus
Hummus

Hummus is a Levantine cuisine dip or spread made from cooked, mashed chickpeas, blended with tahini, olive oil, lemon juice, salt and garlic....
 and whole wheat pita
Pita

Pita is an often round, brown, wheat flatbread made with yeast.Similar to other double-layered flatbread or pocket breads, pita is traditional in many Middle Eastern cuisine and Mediterranean cuisines....
, though protein combining
Protein combining

Protein combining is a controversial theory that vegetarians, particularly vegans, must eat certain complementary foods like beans and rice together in the same meal....
 in the same meal is not necessary). A varied intake of such sources can be adequate.

Iron
Vegetarian diets typically contain similar levels of iron to non-vegetarian diets, but this has lower bioavailability than iron from meat sources, and its absorption can sometimes be inhibited by other dietary constituents. Vegetarian foods rich in iron include black beans, cashews, hempseed, kidney beans, lentils, oatmeal
Oatmeal

Oatmeal is a product of ground oat groats or a porridge made from this product . The term, 'oatmeal' can refer also to other products made from oat groats, such as steel-cut oats, crushed oats, and rolled oats....
, raisins, black-eyed peas, soybeans, many breakfast cereals, sunflower seeds, chickpeas, tomato juice
Tomato juice

Tomato juice is a juice made from squeezed tomatoes. It is usually used as a beverage, either plain or in cocktails such as a Bloody Mary ....
, tempeh
Tempeh

Tempeh, or tempe in Javanese language, is made by a natural culturing and controlled fermentation process that binds soybeans into a cake form....
, molasses
Molasses

Molasses is a thick by-product from the processing of the sugar beet or sugar cane into sugar. The word molasses comes from the Portuguese language word mela?o, which comes from "meli", the Greek word for "honey"....
, and whole-wheat bread. Vegan diets can often be higher in iron than vegetarian diets, because dairy products are low in iron. Iron stores often tend to be lower in vegetarians than non-vegetarians and iron deficiency is thus more common in vegetarian and vegan women and children (adult males are rarely iron deficient), however, iron deficiency anaemia is rare.

Vitamin B12
Plants are not generally significant sources of Vitamin B12
Vitamin B12

Vitamin B12 is a water soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood....
. However, lacto-ovo vegetarians can obtain B12 from dairy products and eggs, and vegans can obtain it from fortified foods and dietary supplements. Since the human body preserves B12 and reuses it without destroying the substance, clinical evidence of B12 deficiency is uncommon. The body can preserve stores of the vitamin for up to 30 years without needing its supplies to be replenished.

The recommendation of taking supplements has been challenged by studies indicating that exogenous B12 may actually interfere with the proper absorption of this vitamin in its natural form. The research on vitamin B12 sources has increased in the latest years and researchers at Hiroshima University
Hiroshima University

, located in the Japan cities of Higashihiroshima, Hiroshima and Hiroshima, was established 1949 by the merger of a number of city educational institutions....
 have developed methods for growing plants rich in vitamin B12.

Fatty acids
Fish is a major source of Omega 3 fatty acids, although some plant-based sources exist such as soy, walnut
Walnut

Walnuts are plants in the family Juglandaceae. They are deciduous trees, 10–40 meter s tall , with pinnate leaves 200?900 millimetres long , with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnut but not the hickory in the same family....
s, pumpkin
Pumpkin

Pumpkin is a gourd-like Squash of the genus Cucurbita and the family Cucurbitaceae . It is a common name of or can refer to cultivars of any one of the following species: Cucurbita pepo, Cucurbita mixta, Cucurbita maxima, and Cucurbita moschata....
 seeds, canola oil and, especially, hempseed, chia seed, flaxseed, and purslane. Purslane contains more Omega 3 than any other known leafy green. Plant foods can provide alpha-linolenic acid
Alpha-linolenic acid

a-Linolenic acid is an organic compound found in many common Vegetable fats and oils. IUPAC nomenclature of organic chemistry, it is named all-cis-9,12,15-octadecatrienoic acid....
 but not the long-chain n-3 fatty acids EPA
Eicosapentaenoic acid

Eicosapentaenoic acid is an omega-3 fatty acid. In physiological literature, it is given the name 20:5. It also has the trivial name timnodonic acid....
 and DHA
Docosahexaenoic acid

Docosahexaenoic acid is an omega-3 fatty acid essential fatty acid. In chemical structure, DHA is a carboxylic acid with a 22-carbon chain and hexa Cis-trans isomerism double bonds; the first double bond is located at the third carbon from the omega end....
, which are found in low levels in eggs and dairy products. Vegetarians, and particularly vegans, have lower levels of EPA and DHA than meat-eaters. While the health effects of low levels of EPA and DHA are unknown, it is unlikely that supplementation with alpha-linolenic acid will significantly increase levels. Recently, some companies have begun to market vegetarian DHA supplements containing seaweed extracts. Similar supplements providing both DHA and EPA have also begun to appear. Whole seaweeds are not suitable for supplementation because their high iodine content limits the amount that may be safely consumed. However, certain algae
Algae

Algae are a large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms. The largest and most complex marine forms are called seaweeds....
 such as spirulina
Spirulina

Spirulina may refer to:* Spirulina , a health-food supplement* Spirulina , a cyanobacterium group* Spirulina , a group of cephalopods including Spirula spirula...
 are good sources of gamma-linolenic acid
Gamma-Linolenic acid

?-Linolenic acid is an essential fatty acid found primarily in vegetable oils. It is sold as a dietary supplement for treating problems with inflammation and auto-immune diseases....
 (GLA), alpha-linolenic acid (ALA), linoleic acid
Linoleic acid

Linoleic acid is an unsaturated omega-6 fatty acid. It is a colorless liquid. In physiological literature, it is called 18:2. Chemically, linoleic acid is a carboxylic acid with an 18-carbon chain and two cis double bonds; the first double bond is located at the sixth carbon from the omega end....
 (LA), stearidonic acid
Stearidonic acid

Stearidonic acid is an Omega-3 fatty acid essential fatty acid, sometimes called moroctic acid. It is biosynthesized from alpha-linolenic acid by the enzyme desaturase....
 (SDA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid
Arachidonic acid

Arachidonic acid is an omega-6 fatty acid 20:4.It is the counterpart to the saturated arachidic acid found in peanut oil, ...
 (AA).

Calcium
Calcium
Calcium

Calcium is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft grey alkaline earth metal, and is the fifth most abundant element by mass in the earth's Crust ....
 intake in vegetarians is similar to non-vegetarians. Some impaired bone mineralisation has been found among vegans who do not consume enough leafy greens, which are sources of abundant calcium. However, this is not found in lacto-ovo vegetarians.

Vitamin D
Vitamin D
Vitamin D

Vitamin D is a group of fat-soluble prohormones, the two major forms of which are vitamin D2 and vitamin D3 . The term vitamin D also refers to metabolites and other analogues of these substances....
 levels do not appear to be lower in vegetarians (although studies have shown that much of the general population is deficient). Vitamin D needs can be met via the human body's own generation upon sufficient and sensible UV sun exposure. Products including milk
Milk

Milk is an opaque white liquid produced by the mammary glands of female mammals . It provides the primary source of nutrition for newborn mammals before they are able to digestion other types of food....
, soy milk
Soy milk

Soy milk and sometimes referred to as soy drink/beverage is a beverage made from soybeans. A stable emulsion of oil, water and protein, it is produced by soaking dry soybeans, and grinding them with water....
 and cereal grains may be fortified to provide a good source of Vitamin D and mushrooms provide over 2700 IU per serving (approx. 3 oz
Ounce

This article is about the unit of mass. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce ....
 or 1/2 cup) of vitamin D2
Ergosterol

Ergosterol , a sterol, is a biological precursor to Vitamin D. It is turned into viosterol by ultraviolet light, and is then converted into ergocalciferol, which is a form of Vitamin D....
, if exposed to just 5 minutes of UV light after being harvested; for those who do not get adequate sun exposure and/or food sources, Vitamin D supplementation may be necessary.

Longevity

A 1999 metastudy compared six major studies from western countries. The study found that the mortality ratio was the lowest in fish eaters (0.82) followed by vegetarians (0.84) and occasional meat eaters (0.84), and was then followed by regular meat eaters (1.0) and vegan (1.0). When the study made its best estimate of mortality ratio with confounding factors considered, the mortality ratio for vegetarians was found to be (0.94).

In "Mortality in British vegetarians", it was concluded that "British vegetarians have low mortality compared with the general population. Their death rates are similar to those of comparable non-vegetarians, suggesting that much of this benefit may be attributed to non-dietary lifestyle factors such as a low prevalence of smoking and a generally high socio-economic status, or to aspects of the diet other than the avoidance of meat and fish."

The Adventist Health Study is an ongoing study of life expectancy in Seventh-day Adventists. This is the only study among others with similar methodology which had favourable indication for vegetarianism. The researchers found that a combination of different lifestyle choices could influence life expectancy by as much as 10 years. Among the lifestyle choices investigated, a vegetarian diet was estimated to confer an extra 1–1/2 to 2 years of life. The researchers concluded that "the life expectancies of California Adventist men and women are higher than those of any other well-described natural population" at 78.5 years for men and 82.3 years for women. The life expectancy
Life expectancy

Life expectancy is the average number of years of life remaining at a given age. It is the average expected lifespan of an individual. Life expectancy is heavily dependent on the criteria used to select the group....
 of California Adventists surviving to age 30 was 83.3 years for men and 85.7 years for women.

Adventist health study is again incorporated into meta studies titled "Does low meat consumption increase life expectancy in humans?" published in American Journal of Clinical Nutrition, which made the conclusion that low meat eating (less than once per week) and other life style choices significantly increase the life expectancy, relative to a group with high meat intake. The study concluded that "The findings from one cohort of healthy adults raises the possibility that long-term (= 2 decades) adherence to a vegetarian diet can further produce a significant 3.6-y increase in life expectancy." However, the study also concluded that "Some of the variation in the survival advantage in vegetarians may have been due to marked differences between studies in adjustment for confounders, the definition of vegetarian, measurement error, age distribution, the healthy volunteer effect, and intake of specific plant foods by the vegetarians." It further states that "This raises the possibility that a low-meat, high plant-food dietary pattern may be the true causal protective factor rather than simply elimination of meat from the diet." In a recent review of studies relating low-meat diet patterns to all-cause mortality, Singh noted that "5 out of 5 studies indicated that adults who followed a low meat, high plant-food diet pattern experienced significant or marginally significant decreases in mortality risk relative to other patterns of intake."

Statistical studies, such as comparing life expectancy
Life expectancy

Life expectancy is the average number of years of life remaining at a given age. It is the average expected lifespan of an individual. Life expectancy is heavily dependent on the criteria used to select the group....
 with regional areas and local diets in Europe also have found life expectancy considerably greater in southern France
France

France , officially the French Republic , is a country whose Metropolitan France is located in Western Europe and that also comprises various Overseas departments and territories of France....
, where a low meat, high plant Mediterranean diet
Mediterranean diet

The Mediterranean diet is a modern nutritional recommendation inspired by the traditional dietary patterns of some of the countries of the Mediterranean Basin....
 is common, than northern France, where a diet with high meat content is more common.News story based on this article: Science Daily, April 25, 2005 "Mediterranean Diet Leads To Longer Life" http://www.sciencedaily.com/releases/2005/04/050425111008.htm

A study by the Institute of Preventive and Clinical Medicine, and Institute of Physiological Chemistry looked at a group of 19 vegetarians (lacto-ovo) and used as a comparison a group of 19 omnivorous subjects recruited from the same region. The study found that this group of vegetarians (lacto-ovo) have a significantly higher amount of plasma carboxymethyllysine and advanced glycation endproducts (AGEs) compared to this group of omnivores. Carboxymethyllysine is a glycation
Glycation

Glycation is the result of a sugar molecule, such as fructose or glucose, bonding to a protein or lipid molecule without the controlling action of an enzyme....
 product which represents "a general marker of oxidative stress and long-term damage of proteins in aging, atherosclerosis and diabetes." "Advanced glycation end products (AGEs) may play an important adverse role in process of atherosclerosis, diabetes, aging and chronic renal failure." The researchers theorised that it may be the higher fructose
Fructose

Fructose is a simple Reducing sugar sugar found in many foods and is one of the three important dietary monosaccharides along with glucose and galactose....
 intake of these particular vegetarians (from higher fruit and vegetable intake) that increased their AGEs levels.

Food safety


E. coli
Vegetarianism is believed to reduce E. coli infections, and proponents point to the link between E. coli
Escherichia coli

'Escherichia coli' , is a Gram negative bacterium that is commonly found in the lower gastrointestinal tract of warm-blooded animals. Most E....
 contaminations in food and industrial scale meat and dairy farms. The most recent E. coli outbreak in North America has once again demonstrated this link because the source of this E. coli was traced back to "a large ranch in the Salinas Valley that has a beef cattle operation" about a half-mile from the spinach fields where spinach became contaminated.

There are several variants of E. coli and they can be found in a healthy human gut, but the deadly strain, O157:H7
Escherichia coli O157:H7

Escherichia coli O157:H7 is an enterohemorrhagic strain of the Bacteria Escherichia coli and a cause of foodborne illness. Infection often leads to bloody diarrhea, and occasionally to kidney failure, especially in young children and elderly people....
 was virtually unheard of until the 1980s. It is believed that this strain evolved in the digestive system of grain fed cattle on large industrial farms. On these farms, grain is used as cattle feed because it is nutrient-packed and increases efficiency. A side effect of feeding grain to cattle is that it increases the acidity of their stomach—and it is in this acidic gut that the deadly O157:H7 thrives.

In 2003, an article in the Journal of Dairy Science found that between 30 and 80 percent of cattle carry E. coli O157:H7. In that same journal article, a quick fix was pointed out: Cows that are switched from a grain diet to a forage diet saw, within 5 days, a 1,000 fold decrease in the abundance of strain O157. But until changes like this are made, the source of many E. coli outbreaks will continue to be high-yield (industrial) meat and dairy farms.

More likely, rather than change the way cattle are fed or raised on industrial farms there will instead be pressure to find technological solutions like food irradiation, plans for HACCP, or simply cooking burgers longer. Suggestions like this have led some experts, like Professor of Science and Environmental Journalism at UC Berkeley, Michael Pollan
Michael Pollan

Michael Pollan is an American author, columnist, activist, and professor of journalism and director of the Knight Program in Science and Environmental Journalism at the University of California, Berkeley....
, to suggest that "All of these solutions treat E. coli O157:H7 as an unavoidable fact of life rather than what it is: a fact of industrial agriculture."

E. coli can be still acquired from any excrement-contaminated food or human commensal bacteria. The recent case of spinach and onions with E. coli contamination in the U.S. shows that vegetarian foods are also susceptible to food safety concerns. In 2005, some people who had consumed branded triple-washed, pre-packaged lettuce
Lettuce

Lettuce is a temperate annual plant or biennial plant of the daisy family Asteraceae. It is most often grown as a leaf vegetable. In many countries, it is typically eaten cold, raw, in salads, hamburgers, tacos, and in many other dishes....
 were infected with E. coli, and in 2007, branded lettuce salad were recalled after they were found to be contaminated by E. coli In fact E. coli outbreaks have also involved unpasteurised apple and orange juice, milk, alfalfa
Alfalfa

Alfalfa is a flowering plant in the pea family Fabaceae cultivated as an important forage crop. In the United Kingdom, Australia and New Zealand it is known as lucerne and as lucerne grass in south Asia....
 sprouts
Sprouts

Sprouts may refer to:* Sprouting, the practice of germinating seeds, often for food purposes* Sprouts * Brussels sprouts* Sprouts * Sprouts ...
, and even water.

Other food scares
Various animal food safety scares over recent years have led to increased numbers of people choosing a semi-vegetarian or vegetarian diet. These scares have included Avian influenza in poultry, foot-and-mouth
Foot-and-mouth disease

Foot-and-mouth disease or hoof-and-mouth disease is a infectious disease and sometimes fatal virus disease of cloven-hoofed animals, including domestic animals such as cattle, Domestic water buffalo, Domestic sheep, goats and pigs, as well as antelope, bison and other wild Bovidaes, and deer....
 in sheep, PCBs
Polychlorinated biphenyl

Polychlorinated biphenyls are a class of organic compounds with 1 to 10 chlorine atoms attached to biphenyl which is a molecule composed of two benzene rings each containing six carbon atoms....
 in farmed salmon, mercury in fish, generally high dioxin
Dioxin

Polychlorinated dibenzodioxins , or simply dioxins, are a group of polyhalogenated compounds which are significant because they act as environmental pollutants....
 concentrations in animal products, and artificial growth hormone
Growth hormone

Growth hormone is a peptide hormone. It stimulates human development and cell reproduction in humans and other animals. It is a 191-amino acid, single chain polypeptide hormone which is synthesized, stored, and secreted by the somatotroph cells within the lateral wings of the anterior pituitary gland....
s, antibiotic
Antibiotic

In common usage, an antibiotic is a substance or compound that kills or inhibits the growth of bacteria. Antibiotics belong to the group of antimicrobial compounds used to treat infections caused by microorganisms, including fungus and protozoa....
s or BSE
Bovine spongiform encephalopathy

Bovine Spongiform Encephalopathy , commonly known as Mad-Cow Disease , is a fatal, neurodegenerative disease in cattle, that causes a spongy degeneration in the brain and spinal cord....
, also known as Mad Cow Disease, in cows. According to various organisations, vCJD in humans is strongly linked with exposure to the BSE agent that has been found in beef
Beef

Beef is the culinary name for meat from bovines, especially domestic cattle . Beef is one of the principal meats used in the cuisine of Australia, European cuisine and the Americas, and is also important in Africa, East Asia, and Southeast Asia....
. Toxins such as lead and mercury can bioaccumulate in animal products in higher concentrations than what is considered safe. Vegetables and fruits have a risk of being contaminated by pesticide residue or by banned chemicals being used to ripen fruits. Recent cases of several widespread outbreaks of salmonella infection, including outbreaks from contaminated peanut butter, frozen pot pies & puffed vegetable snacks also indicate that vegetarian foodstuff is susceptible to contamination.

Medical use

In Western medicine, patients are sometimes advised to adhere to a vegetarian diet. Certain alternative medicine
Alternative medicine

The term alternative medicine, as used in the modern western world, encompasses any healing practice "that does not fall within the realm of conventional medicine"....
s, such as Ayurveda
Ayurveda

Ayurveda is a system of traditional medicine native to India, and practiced in other parts of the world as a form of alternative medicine. In Sanskrit, the word Ayurveda comprises the words , meaning 'life' and , meaning 'science'....
 and Siddha
Siddha medicine

The Siddha medicine is a form of south India traditional medicine and part of the trio Indian medicines - Ayurveda, Siddha and Unani. This system of medicine was popular in ancient India,Due to the antiquity of this medical system....
, prescribe a vegetarian diet as a normal procedure.

Physiology

The mainstream scientific consensus is that humans are physiologically
Human physiology

Human physiology is the science of the mechanical, physical, and biochemical functions of humans in good health, their organs, and the cells of which they are composed....
 best suited to an omnivore
Omnivore

Omnivores are species that eating both plants and animals as their primary food source. They are opportunistic, general feeders not specifically adapted to eat and digest either meat or plant material exclusively....
 diet. The Vegetarian Resource Group, among others, has concluded that humans are naturally omnivores based on the human ability to digest meat, as well as plant foods, with the correspondent metabolic tendency to an adaptation that makes them need both animal and vegetable nourishment. Other arguments hold that humans are more anatomically similar to herbivore
Herbivore

Herbivory is a form of predation in which an organism, known as an herbivore, heterotrophs principally autotrophs such as plants, algae and photosynthesizing bacteria....
s, with long intestinal tracts and blunt teeth, unlike omnivores and carnivores. Human teeth, including relatively blunt canines, are more similar to those found in animals with herbivore diets than in carnivores and most omnivores. Nutritional experts believe that early hominids evolved into eating meat as a result of huge climatic changes that took place three to four million years ago, when forests and jungles dried up and became open grasslands and opened hunting and scavenging opportunities.

Additional reasons for a vegetarian diet


Ethics

Various ethical reasons have been suggested for choosing vegetarianism. It has been argued, for example, that the production, slaughtering
Slaughterhouse

A slaughterhouse, also called an abattoir ,or freezing works , is a facility where animals are killed and processed into meat foods....
, and consumption of meat or animal products is unethical
Ethics

Ethics is a word for a philosophy that encompasses proper conduct and good living. It is significantly broader than the common conception of ethics as the analyzing of right and wrong....
. Reasons for this include a belief in animal rights
Animal rights

Animal rights, also known as animal liberation, is the idea that the most basic interests of animals should be afforded the same consideration as the similar interests of human beings....
, an aversion to inflicting pain or harm on other sentient beings, or a belief that the unnecessary killing of other animals is inherently wrong.

It has also been argued that although production and consumption of meat may be acceptable on its own terms, the methods by which animals are reared in the commercial industry are unethical. The book Animal Liberation
Animal Liberation (book)

Animal Liberation is a book by Australian philosopher Peter Singer, published in 1975.Although Singer is not the first person to apply the concept of moral standing to nonhuman animals the book is widely considered within the animal rights movement to be the founding philosophical statement of its ideas....
 by Peter Singer
Peter Singer

Peter Albert David Singer is an Australian Philosophy. He is the Ira W. DeCamp Professor of Bioethics at Princeton University, and laureate professor at the Centre for Applied Philosophy and Public Ethics , University of Melbourne....
 has been very influential on the animal rights movement and specifically ethical vegetarianism and veganism. In developed countries, ethical vegetarianism has become popular particularly after the spread of factory farming
Factory farming

Factory farming is the practice of raising farm animals in confinement at high stocking density, where a farm operates as a factory — a practice typical in Industrial agriculture by agribusinesses....
, a system of livestock farming where animals are kept indoors throughout the greater part of their lives in conditions of very restricted mobility. Pigs
PIGS

PIGS is a four letter acronym that can stand for:* PIGS : Phosphatidylinositol glycan anchor biosynthesis, class S, a human gene.* PIGS : Portugal, Italy, Greece and Spain, an informal grouping of sluggish economies....
, laying hens, broiler chickens, and veal
Veal

Veal is the meat of calves . Though veal can be produced from any calf, most veal comes from male calves of dairy cattle breeds. Compared to other meats, veal has a delicate taste and tender texture....
 calves are the animals most often kept under these conditions. Factory farming has reduced the sense of husbandry that used to exist in farming and which has led to animals being treated as commodities. Many believe that the treatment that animals undergo in the production of meat and animal products obliges them to never eat meat or use animal products.

Arguments that do not pertain to animal rights exist in many vegetarian philosophies as well. The advance of global warming is one of these key issues in environmental vegetarians. According to a study done by the University of Chicago and reprinted in Time magazine, switching from a meat-eating diet to vegetarianism reduces one carbon footprint by 1.4 times the amount of switching from a Toyota Camry to a Hybrid car. This is because of the vast amount of methane that is put into the air from overbreeding for consumption, methane being a 32% more potent greenhouse gas than carbon dioxide. Shipment of the grain and the cattle itself also plays a part in this issue, being that it takes 8 pounds of grain to get 1 pound of meat. Many vegetarians feel that eating so high up on the food chain plays too large a part in global starvation to justify meat consumption.

Religion

offers a wide range of vegetarian delicacies because Hinduism
Hinduism

'Hinduism' is the predominant religion of the Indian subcontinent. Hinduism is often referred to as , a Sanskrit phrase meaning "the eternal dharma", by its practitioners....
, practiced by majority of India's populace, encourages vegetarian diet. Shown here is a vegetarian thali
Thali

Thali is an Indian meal with contents varying from one Indian cuisine to another. A thali is a selection of different dishes, usually served in small bowls on a round tray....
.]] Hinduism
Hinduism

'Hinduism' is the predominant religion of the Indian subcontinent. Hinduism is often referred to as , a Sanskrit phrase meaning "the eternal dharma", by its practitioners....
, Buddhism
Buddhism

Buddhism is a family of beliefs and practices considered by most to be a religionand is based on the teachings attributed to Siddhartha Gautama, commonly known as "The Buddha" , who was born in what is today Nepal....
, Jainism
Jainism

Jainism is one of the oldest Indian religions that originated in India. Jains believe that every soul is divine and has the potential to achieve God-consciousness....
 and Sikhism teach vegetarianism as moral conduct. Buddhism in general does not prohibit meat eating, while Mahayana Buddhism
Mahayana

Mahayana is one of the two main existing schools of Buddhism and a term for classification of Buddhist philosophy and practice. It was History of Buddhism in India....
 encourages vegetarianism as beneficial for developing compassion. Other denominations that advocate a fully vegetarian diet include the Seventh-day Adventists
Seventh-day Adventist Church

The Seventh-day Adventist Church is a Christianity Religious denomination which is distinguished mainly by its observance of Saturday, the original Days of the week of the Judeo-Christian week, as the Sabbath and Seventh-day Adventism....
, the Rastafari movement
Rastafari movement

The Rastafari movement is a monotheism, Abrahamic religions, new religious movement that accepts Haile Selassie I of Ethiopia, the former Emperor of Ethiopia, as the incarnation of God, called Jah or Jah Rastafari....
 and the Hare Krishnas.

Hinduism
Some major paths of Hinduism
Hinduism

'Hinduism' is the predominant religion of the Indian subcontinent. Hinduism is often referred to as , a Sanskrit phrase meaning "the eternal dharma", by its practitioners....
 hold vegetarianism as an ideal. There are three main reasons for this: the principle of nonviolence (ahimsa
Ahimsa

Ahimsa is a Sanskrit term meaning to do no harm . It is an important tenet of the religions that originated in ancient India . Ahimsa is a rule of conduct that bars the killing or injuring of living beings....
) applied to animals; the intention to offer only "pure" (vegetarian) food to a deity and then to receive it back as prasad
Prasad

Prasada is both a mental condition of generosity, as well as a material substance that is first offered to a deity and then consumed . Literally, a gracious gift....
; and the conviction that non-vegetarian food is detrimental for the mind and for spiritual development. Nonviolence is a common concern of all the vegetarian traditions in Hinduism; the other two aspects are relevant for those who follow special spiritual paths.

However, the food habits of Hindus vary according to their community and according to regional traditions. Hindu vegetarians usually eschew eggs but consume milk and dairy products, so they are lacto-vegetarians. Milk and milk products are vital in the traditional food habits of India
India

India, officially the Republic of India , is a country in South Asia. It is the List of countries and outlying territories by total area country by geographical area, the List of countries by population country, and the most populous liberal democracy in the world....
.

Jainism
Followers of Jainism
Jainism

Jainism is one of the oldest Indian religions that originated in India. Jains believe that every soul is divine and has the potential to achieve God-consciousness....
 are most commonly lacto-vegetarians. No products obtained from dead animals are allowed. Jains hold vegetarianism as the ideal diet in a similar fashion to Hindu traditions but with emphasis on their principle of all-round non-violence (ahimsa
Ahimsa

Ahimsa is a Sanskrit term meaning to do no harm . It is an important tenet of the religions that originated in ancient India . Ahimsa is a rule of conduct that bars the killing or injuring of living beings....
). This is for them an indispensable condition for spiritual progress. Some particularly dedicated individuals are fruitarians
Fruitarianism

Fruitarians eat in principle only the fruit of plants.Some people consider themselves fruitarians even if their diet is not 100% fruit. Usually fruitarians who include foods other than fruit follow a vegan diet....
. Honey is forbidden, because its collection is seen as violence against the bees. Some Jains do not consume plant parts that grow underground such as roots and bulbs, because tiny animals may be killed when the plants are pulled up.

Buddhism
Theravadins consider that taking of life and eating meat which is already killed is the same. If Buddhist monks "see, hear or know" a living animal was killed specifically for them to eat, they must refuse it or else incur an offense. Buddha did not make any comment discouraging them to eat meat nor did he made any rule or prohibition in his religion on any thing. His teachings simply say that "taking a life of an living thing either by killing or letting someone to kill it in your place or by supporting such a sinful act you will be making a great sin but anyone is free to choose what his path is"

In Mahayana Buddhism, there are several Sanskrit
Sanskrit

Sanskrit is a historical Indo-Aryan language, one of the liturgical languages of Hinduism and Buddhism, and one of the 22 official languages of India....
 texts where the Buddha instructs his followers to avoid meat. Mahayana Buddhism advises monks to be strictly vegetarian and is recommended for laypeople, but not required.

Sikhism
Followers of the Sikh
Sikhism

Sikhism , founded on the teachings of Guru Nanak and ten successive Sikh Gurus in fifteenth century Punjab region, is the Major religious groups organized religion in the world....
 religion are divided in their opinion on whether their religion opposes meat consumption for Sikhs. Although many Sikhs do eat meat, some initiated Sikhs or "amritdharis" that belong to Sikh Sects (eg Akhand Kirtani Jatha, Namdhari, Rarionwalay etc)abstain from the consumption of meat and eggs. Mainstream "amritdhari" Sikh's (i.e. those that follow the Sikh Rehat Maryada, ), are not compelled to be meat free.

In the case of meat, the Sikh Gurus
Sikh Gurus

Sikhism was established by Guru Nanak and nine other Sikh Gurus over the period of 1469 to 1708. Most of the Gurus were born in Northern India, although they traveled extensively from as far west as Iraq to Assam in the east and Sri Lanka in the south....
 have indicated their preference for a simple diet and depending on what one sees as a simple diet could be meat or vegetarian. Passages from the Guru Granth Sahib
Guru Granth Sahib

The Guru Granth Sahib , or Adi Sri Guru Granth Sahib, is the holy scripture and the final Guru#Classification of gurus of the Sikhs. It is a voluminous text of 1430 pages, compiled and composed during the period of Sikh Gurus, from 1469 to 1708....
 (the holy book of Sikhs, also known as the Adi Granth) says that fools argue over this issue. Guru Nanak said that any consumption of food involves a drain on the Earth's resources and thus on life. The tenth guru, Guru Gobind Singh
Guru Gobind Singh

Guru Gobind Singh was the tenth Sikh Gurus of Sikhism. He was born in Patna, Bihar in India and became a Guru on November 11 1675, at the age of nine years, succeeding his father Guru Tegh Bahadur....
, prohibited the Sikhs from the consumption of halal or Kutha (any ritually slaughtered meat) meat because of the Sikh belief that sacrificing an animal in the name of God is mere ritualism (something to be avoided).

Judaism
A number of medieval scholars of Jewish religion
Judaism

Judaism is a set of beliefs and practices originating in the Hebrew Bible , as later further explored and explained in the Talmud and other texts....
 (e.g. Joseph Albo
Joseph Albo

Joseph Albo was a Jew philosophy and rabbi who lived in Spain during the fifteenth century, known chiefly as the author of Sefer ha-Ikkarim , the classic work on the Jewish principles of faith....
) regard vegetarianism as a moral ideal, not because of a concern for the welfare of animals, but because of the fact that the slaughter of animals might cause the individual who performs such acts to develop negative character traits, viz., meanness and cruelty. Therefore, their concern was with regard to possible harmful effects upon human character rather than with animal welfare. Indeed, Rabbi Joseph Albo maintains that renunciation of the consumption of meat for reasons of concern for animal welfare is not only morally erroneous but even repugnant.

One modern-day scholar who is often cited as looking upon vegetarianism with extreme favour is the late Rabbi Abraham Isaac Kook
Abraham Isaac Kook

File:Abraham Isaac Kook 1924.jpgAbraham Isaac Kook was the first Ashkenazi Jews chief rabbi of the British Mandate for Palestine, the founder of the Religious Zionism Yeshiva Merkaz HaRav, Jewish thinker, Halacha, Kabbalah and a renowned Torah scholar....
. It is indeed the case that in his writings, Rabbi Kook speaks of vegetarianism as an ideal, and points to the fact that Adam did not partake of the flesh of animals. In context, however, Rabbi Kook makes those comments in his portrayal of the eschatological (messianic) era. He regards man's moral state in that period as being akin to that of Adam before his sin and does indeed view renunciation of enjoyment of animal flesh as part of the heightened moral awareness which will be manifest at that time.

Rabbi Kook is emphatic in admonishing that vegetarianism not be adopted as a norm of human conduct prior to the advent of the eschatological era.

According to some Kabbalists
Kabbalah

Kabbalah is a discipline and school of thought discussing the mysticism aspect of Judaism. It is a set of esoteric teachings that are meant to explain the relationship between an infinite, eternal and essentially unknowable Creator deity with the finite and mortal universe of His creation....
, only a mystic, who is able to sense and elevate the reincarnated human souls and "divine sparks", is permitted to consume meat, though eating the flesh of an animal might still cause spiritual damage to the soul. A number of Orthodox Jewish vegetarian groups and activists promote such ideas and believe that the halakhic
Halakha

Halakha ? also Hebrew transliteration Halocho and Halacha ? is the collective body of Judaism religious law, including biblical law and later talmudic and rabbinic law, as well as customs and traditions....
 permission to eat meat is a temporary leniency for those who are not ready yet to accept the vegetarian diet.

Having ties with both ancient Judaism
Judaism

Judaism is a set of beliefs and practices originating in the Hebrew Bible , as later further explored and explained in the Talmud and other texts....
 and Christianity
Christianity

Christianity is a Monotheistic religion #Christian view religion centered on the life and teachings of Jesus as New Testament view on Jesus' life....
 members of the ancient Essene religious group practiced strict vegetarianism sharing a similar belief with the Hindus'/Jains' idea of Ahimsa
Ahimsa

Ahimsa is a Sanskrit term meaning to do no harm . It is an important tenet of the religions that originated in ancient India . Ahimsa is a rule of conduct that bars the killing or injuring of living beings....
 or "harmlessness".

Translation of the Torah
Torah

The term "Torah" , or Five Books of Moses or Pentateuch, refers to the entirety of Judaism's founding Halakha and ethical religious texts....
's Ten Commandments state "thou shall not murder." Many argue that this can also be taken as meaning not to kill at all, animals nor humans, or at least "that one shall not kill unnecessarily," in the same manner that onerous restrictions on slavery in the bible have been interpreted by modern theologians as to suggest banning the practice. It is written in the Torah, in the book of Devarim "When YHVH your God enlarges your border, as He has promised you, and you will say: 'I will eat meat', because your being desires to eat meat; you may eat meat, after all that your being desires."

Christianity
While vegetarianism is not common in western Christian
Christian

A Christian is a person who adheres to Christianity, a Monotheism#Christian view religion centered on the life and teachings of Jesus and interpreted by Christians to have been prophesied in the Hebrew Bible/Old Testament....
 thought, the concept appears periodically. According to the Bible, in the beginning, humans and animals were vegetarian. Immediately after the Flood, God permitted the eating of meat,; however, some maintain that God permitted the consumption of meat temporarily because all plants had been destroyed as a result of the flood. Some Christians believe that the Bible explains that, in the future, humans and animals will return to vegetarianism.

Some Christian leaders, such as the Reverend Andrew Linzey
Andrew Linzey

Andrew Linzey is an Anglican priest, theologian, writer and Christian vegetarianism.He is a member of the Faculty of Theology in the University of Oxford and held the world?s first academic post in Ethics, Theology and Animal Welfare ? the Bede Jarret Senior Research Fellowship at Blackfriars Hall, University of Oxford....
, have supported the view that Jesus was a vegetarian, even though Jesus ate fish in . Some people believe that the Book of Daniel
Book of Daniel

The Book of Daniel is a book in both the Hebrew Bible and the Christian Old Testament. Originally written in Hebrew language and Aramaic language, it is set during the Babylonian Captivity, a period when Jews were deported and exiled to Babylon following the Siege of Jerusalem of 597 BC....
 specifically promotes vegetarianism as beneficial. However, common theology argues that in this instance Daniel is rejecting food that is considered to be unholy by his faith (eating food that had been sacrificed to pagan gods), not strictly meat. The Bible's New Testament
New Testament

The New Testament is the name given to the second major division of the Christianity Bible, the first such division being the much longer Old Testament....
 says that a person's dietary choice is of small consequence and should not be a point of confrontation (see Romans 14:1–3). Therefore, some modern Christians consider vegetarianism as a perfectly acceptable personal choice that has many of the same implications as fasting.

All Oriental Orthodox, Eastern Orthodox
Eastern Orthodox Church

The Eastern Orthodox Church is the second largest single Christian communion in the world with an estimated 225 million members worldwide. It is considered by its adherents to be the Four Marks of the Church established by Jesus Christ and his Apostles nearly 2000 years ago....
, and Eastern Catholic monastics
Monk

A Monk is a person who practices religious asceticism, the unconditioning of mind and body in favor of the realization of one's true nature, and does so living either alone or with any number of like-minded people, whilst always maintaining some degree of physical separation from those not sharing the same purpose....
 abstain from meat year-round, and many abstain from dairy and seafood as well. Laity
Laity

In religious organizations, the laity comprises all persons who are not clergy. A person who is a member of a religious order who is not Holy Orders clergy is considered as a member of the laity, even though they are members of a religious order ....
 generally abstain from animal products on Wednesdays (due to a traditional belief that it was a Wednesday on which Judas arranged to betray Jesus Christ) and Fridays (because Jesus was crucified
Crucifixion

Crucifixion is an ancient method of execution , whereby the condemned person is tied or nailed to a large wooden cross and left to hang until dead....
 on a Friday), as well as during the four major fasting periods of the year: Great Lent
Great Lent

Great Lent, or the Great Fast, is the most important fasting season in the church year in Eastern Christianity, which prepares Christians for the greatest feast of the church year, Easter ....
, the Apostles' Fast
Apostles' Fast

The Apostles' Fast, also called the Fast of the Holy Apostles, the Fast of Peter and Paul, or sometimes St. Peter's Fast, is a fasting observed by Eastern Orthodox, Oriental Orthodox and Eastern Catholic Christians....
, the Dormition Fast and the Nativity Fast
Nativity Fast

The Nativity Fast, is a period abstinence and penance practiced by the Eastern Orthodox Church, Oriental Orthodox, and Eastern Catholic Churches, in preparation for the Nativity of Christ, ....
. This is not for environmental or animal welfare
Animal welfare

Animal welfare refers to the viewpoint that it is morally acceptable for humans to use nonhuman animals for food, in Animal testing, as clothing, and in entertainment, so long as unnecessary suffering is avoided....
 reasons, but for spiritual reasons. Fasting is seen as purification and the regaining of innocence. Through obedience to the Orthodox Church and its ascetic practices, the Orthodox Christian seeks to rid himself or herself of the passions, or the disposition to sin.

The Seventh-day Adventist Church
Seventh-day Adventist Church

The Seventh-day Adventist Church is a Christianity Religious denomination which is distinguished mainly by its observance of Saturday, the original Days of the week of the Judeo-Christian week, as the Sabbath and Seventh-day Adventism....
 is a Christian denomination that recommends the vegetarian diet as a holistic lifestyle choice within its teachings. A number of the founders of the Seventh-day Adventist Church, including Joseph Bates
Joseph Bates (Adventist)

Joseph Bates was an American seaman and revivalist minister. He was the founder and developer of Sabbatarian Adventism, a strain of religious thinking that evolved into the Seventh-day Adventist Church....
 and Ellen White adopted the vegetarian diet during the nineteenth century, and Ellen White reportedly received visions regarding the health benefits of the vegetarian diet. More recently, members of the Seventh-day Adventist Church in California have been involved in research into longevity due to their healthy lifestyle, which includes maintaining a vegetarian diet. This research has been included within a National Geographic article.

Islam

Islam
Islam

Islam is a Monotheism, Abrahamic religion originating with the teachings of the Prophets of Islam Muhammad, a 7th century Arab religious and political figure....
 allows the consumption of meat, if the meat is "halal
Halal

Halal is an Arabic term designating any object or an action which is permissible to use or engage in, according to Islamic law and custom. It is the opposite of haraam....
". The choice to live vegetarian is a personal decision only, supported by a general religious philosophy stressing kind treatment of animals. Vegetarianism has been practiced by some influential Muslims including the Indian theologian, female mystic and poet Râbi‘ah al-‘Adawîyah of Basrah
Rabia al-Adawiyya

Rabi?a al-?Adawiyya al-Qaysiyya or simply Rabi?a al-Basri was a female Muslim Sufism Qalandar saint....
, who died in the year 801, and the Sri Lankan sufi master Bawa Muhaiyaddeen
Bawa Muhaiyaddeen

Muhammad Raheem Bawa Muhaiyaddeen was a saintly Tamil language-speaking teacher and Sufism mystic from the island of Sri Lanka who first came to the United States on October 11th, 1971 and established the Bawa Muhaiyaddeen Fellowship of North America in Philadelphia....
 who established The Bawa Muhaiyaddeen Fellowship of North America in Philadelphia.

Muslims have the freedom of choice to be vegetarian for medical reasons or if they do not personally like the taste of meat. However, the choice to eat vegetarian can be controversial. According to Hâfiz Nazr Ahmad, although the number of Muslim vegetarians today is increasing, individual adherents tend to keep quiet about it.

In January 1996, The International Vegetarian Union announced the formation of the Muslim Vegetarian/Vegan Society. They noted that the Quran states that "There is not an animal on earth, nor a bird that flies on its wings - but they are communities like you." (The Quran, 6:38)

Many Muslims who normally eat meat will select vegetarian options when dining in non-halal restaurants. This way they can be certain to observe dietary restrictions.

Neopaganism
Many who practice a faith that falls under the Neopagan umbrella also practice vegetarianism. Since Neopaganism generally emphasises the sanctity of Earth and Nature, a vegetarian diet is sometimes adopted out of concern for the environment
Environmental vegetarianism

Environmental vegetarianism is the practice of vegetarianism or veganism based on the fact that the animal production by Intensive farming is Natural environment sustainable development....
 and/or animal welfare.

Environmental


Environmental vegetarianism is based on the belief that the production of meat and animal products for mass consumption, especially through factory farming
Factory farming

Factory farming is the practice of raising farm animals in confinement at high stocking density, where a farm operates as a factory — a practice typical in Industrial agriculture by agribusinesses....
, is environmentally
Environmentalism

Environmentalism is a broad philosophy and social movement centered on a concern for the Conservation movement and improvement of the environment ....
 unsustainable
Sustainable development

Sustainable development is a pattern of resource use that aims to meet human needs while preserving the environment so that these needs can be met not only in the present, but in the indefinite future....
 or otherwise harmful. Recent research strongly supports these concerns. According to a 2006 United Nations
United Nations

The United Nations is an international organization whose stated aims are to facilitate cooperation in international law, international security, economic development, Social change, human rights and achieving world peace....
 initiative, the livestock industry is one of the largest contributors to environmental degradation worldwide, and modern practices of raising animals for food contributes on a "massive scale" to air and water pollution, land degradation, climate change, and loss of biodiversity. The initiative concluded that "the livestock sector emerges as one of the top two or three most significant contributors to the most serious environmental problems, at every scale from local to global."

In addition, animal agriculture has been pointed out as one of the largest sources of greenhouse gases–responsible for 18 percent of the world's greenhouse gas emissions as measured in CO2 equivalents. By comparison, all of the world's transportation (including all cars, trucks, buses, trains, ships, and planes) emits 13.5 percent of the CO2. Animal farming produces 65 percent of human-related nitrous oxide and 37 percent of all human-induced methane. The habitat for wildlife provided by large industrial monoculture
Monoculture

Monoculture is the agricultural practice of producing or growing one single crop over a wide area. The term is also applied in several fields. It is usually developed by extensive growing farmers....
 farms is very poor, and modern industrial agriculture has been considered a threat to biodiversity
Biodiversity

Biodiversity is the variation of life forms within a given ecosystem, biome, or for the entire Earth. Biodiversity is often used as a measure of the health of biological systems....
 compared with farming practices such as organic farming
Organic farming

Organic farming is a form of agriculture that relies on crop rotation, green manure, compost, biological pest control, and mechanical cultivation to maintain soil productivity and control pest s, excluding or strictly limiting the use of synthetic fertilizers and synthetic pesticides, plant growth regulators, livestock feed additives, and gen...
, permaculture
Permaculture

Permaculture is an approach to designing human settlements and perennial agriculture systems that mimic the relationships found in the natural Ecology....
, arable
Agronomy

Agronomy is the science and technology of using plants for food, fuel, feed, and fiber. Agronomy encompasses work in the areas of plant genetics, plant physiology, meteorology, and soil science....
, pastoral
Pastoral

Pastoral, as an adjective, refers to the lifestyle of shepherds and pastoralists, moving livestock around larger areas of land according to seasons and availability of water and food....
, and rainfed agriculture.

Animals fed on grain, and those that rely on grazing need far more water than grain crops. According to the USDA
United States Department of Agriculture

The United States Department of Agriculture is the United States federal executive departments responsible for developing and executing Federal government of the United States policy on farming, agriculture, and food....
, growing the crops necessary to feed farmed animals requires nearly half of the United States' water supply and 80 percent of its agricultural land. Additionally, animals raised for food in the U.S. consume 90 percent of the soy crop, 80 percent of the corn crop, and a total of 70 percent of its grain.

When tracking food animal production from the feed trough to consumption, the inefficiencies of meat, milk and egg production range from 4:1 up to 54:1 energy input to protein output ratio. This firstly because the feed first needs to be grown before it is eaten by the cattle, and secondly because warm-blooded vertebrates need to use a lot of calories just to stay warm (unlike plants or insects). An index which can be used as a measure is the efficiency of conversion
Efficiency of conversion

The efficiency of conversion of ingested food to unit of body substance is an index measure of food fuel efficiency in animals. The ECI is a rough scale of how much of the food ingestion is converted into growth in the animal's biomass....
 of ingested food to body substance, which indicates, for example, that only 10% is converted to body substance by beef cattle
Beef cattle

Beef cattle are cattle raised for meat production . The meat of cattle is known as beef. When raised in a feedlot a [cow, calf, hiefer, bull, steer] are known as feeder cattle, and are larger than other cattle....
, versus 19–31% by silkworms and 44% by German cockroach
German cockroach

The German cockroach or Croton bug is a small species of cockroach, measuring about to long. It can be tan through brown to almost black, and has two dark parallel streaks running from the head to the base of the wings....
es. Ecology professor David Pimentel has claimed, "If all the grain currently fed to livestock in the United States were consumed directly by people, the number of people who could be fed would be nearly 800 million." To produce animal based food seems to be, according to these studies, typically much less efficient than the harvesting of grains, vegetables, legumes, seeds and fruits. However, this would not apply to animals that are grazed rather than fed, especially those grazed on land that could not be used for other purposes. Nor would it apply to cultivation of insect
Insect

Insects are the biggest class of arthropods and the only ones with wings. They are the most diverse group of animals on the planet. They are most diverse at the equator and their diversity declines toward the poles....
s for food (called entomophagy
Entomophagy

Entomophagy is the practice of eating insects as food. Entomophagy is seen in a large number of taxonomic groups including insects , birds, reptiles, amphibians and mammals....
), which may be more environmentally sustainable than eating food coming from cattle farming. Meat produced in a laboratory (called in vitro meat
In vitro meat

In vitro meat, also known as laboratory-grown meat or cultured meat, is animal flesh that has never been part of a complete, living animal....
) may be also more environmentally sustainable than regularly produced meat.

According to the theory of trophic dynamics, it requires 10 times as many crops to feed animals being bred for meat production as it would to feed the same number of people on a vegetarian diet. Currently, 70 percent of all the wheat, corn, and other grain produced is fed to farmed animals. This has led many proponents of vegetarianism to believe that it is ecologically irresponsible to consume meat. Rearing a relatively small number grazing animals is often beneficial, as observed by the Food Climate Research Network at Surrey University, which reports, "A little bit of livestock production is probably a good thing for the environment".

Labour conditions

Some groups promote vegetarianism as a way to offset poor treatment and working conditions of workers in the contemporary meat industry. These groups cite studies showing the psychological damage caused by working in the meat industry, especially in factory and industrialised settings, and argue that the meat industry violates its labourers' human rights by delegating difficult and distressing tasks without adequate counselling, training and debriefing. However, the working conditions of agricultural workers, particularly non-permanent ones, remain poor and well below conditions prevailing in other economic sectors. Accidents, including pesticide poisoning, among the farmers and plantation workers contribute to increased health risks, including mortality. In fact, according to the International Labour Organization
International Labour Organization

The International Labour Organization is a specialized agency of the United Nations that deals with labour issues. Its headquarters are in Geneva, Switzerland....
, agriculture is one of the three most dangerous jobs in the world.

Economical

Similar to environmental vegetarianism is the concept of economic vegetarianism
Economic vegetarianism

An economic vegetarian is a person who practices vegetarianism from either the philosophical viewpoint that the consumption of meat is expensive, part of a conscious simple living strategy or just because of necessity....
. An economic vegetarian is someone who practices vegetarianism from either the philosophical viewpoint concerning issues such as public health and curbing world starvation, the belief that the consumption of meat is economically unsound, part of a conscious simple living
Simple living

Simple living is a lifestyle characterized by minimizing the 'more-is-better' pursuit of wealth and Consumerism. Adherents may choose simple living for a variety of personal reasons, such as spirituality, health, increase in 'quality time' for family and friends, Stress reduction, personal taste or frugality....
 strategy or just out of necessity. According to the WorldWatch Institute, "Massive reductions in meat consumption in industrial nations will ease their health care burden while improving public health; declining livestock herds will take pressure off rangelands and grainlands, allowing the agricultural resource base to rejuvenate. As populations grow, lowering meat consumption worldwide will allow more efficient use of declining per capita land and water resources, while at the same time making grain more affordable to the world's chronically hungry." Economic vegetarians also may include people from third world
Third World

Third World is a categorical label used to describe states that are considered to be developed in terms of their economy or level of industrialization, globalization, standard of living, health, education or other criteria for 'advancements'....
 countries who follow a de facto vegetarian diet due to the high price of meat.

Psychological

Some vegetarians choose to be so in part because they find meat and meat products aesthetically unappetising. The Whole Earth Vegetarian Catalogue's '49 good reasons for being a vegetarian' says that one reason for being a vegetarian is that "Decaying animal parts, whether in a freezer case or served in restaurants, can never be as aesthetically pleasing to the senses as the same foods made from wholesome vegetable sources. Only habit can allow one not to perceive this: a change in diet makes this self evident."

The metaphor by Douglas Dunn
Douglas Dunn

Douglas Eaglesham Dunn, Order of the British Empire is a Scotland poet, academic, and critic. He currently lives in Scotland.Dunn was born in Inchinnan, Renfrewshire....
 is that if one gives a young child an apple and a live chicken, the child would instinctively play with the chicken and eat the apple, whereas if a cat were presented with the same choices, its natural impulse would be the opposite.

Though this may be considered a flawed comparison, as cats are carnivores and not omnivores, it has been noted that comparatively omnivorous human-like species such as chimpanzees' offspring may not instinctively kill such hunted prey as Senegal Bushbabies
Senegal Bushbaby

The Senegal Bushbaby , also known as the Senegal Galago, the Lesser Galago or the Lesser Bush Baby, is a small, nocturnal primate, a member of the galago family Galagidae....
 when presented with one and banana or other fruit either, despite hunting and eating them. The comparison may also suffer from the "Appeal to nature
Appeal to nature

Appeal to nature is a commonly seen fallacy of relevance consisting of a claim that something is good and evil or ethics because it is nature, or that something is bad or wrong because it is unnatural....
" logical fallacy.

In a similar assertion, Scott Adams
Scott Adams

Scott Raymond Adams is the creator of the Dilbert comic strip and the author of several business commentaries, social satires and experimental philosophy books....
, who is also a vegetarian, once wrote humorously: "I point out that a live cow makes a lion salivate, whereas a human just wants to say 'moo' and see if the cow responds."

However, this does not mean that humans naturally find eating meat unappetising simply because they can interact with other animals without regarding them as food: this same non-predatory inter-species interaction can be seen in chimpanzees, which have been seen toying with other animals without regarding them as prey and even rarely socialising with other species.

In the therapy of some health disorders and/or food intolerances vegetarian diets are considered a necessary element.

Cultural

People may choose vegetarianism because they were raised in a vegetarian household or because of a vegetarian partner, family member, or friend. A predominantly and traditionally vegetarian society also facilitates the continuance of such a tradition.

Limited vegetarianism appears to be an appealing alternative for young people in Western societies. In 2007 an experiment, originating at the University of Michigan Medical School, intending to study how memes spread led to an included attempt to encourage limited vegetarianism. It has been the meme itself that has brought life to the concept of "Vegetarian Wednesday
Vegetarian Wednesday

Vegetarian Wednesday is a grass-roots movement aimed at getting people to try vegetarianism one day each week. The movement was started as a community-based blog in Ann Arbor, Michigan, by 9-year-old Eleanor Mugele and her father, Josh Mugele, a medical student at the University of Michigan....
." The idea is that those choosing to adopt this limited vegetarian diet would consume their normal daily food except for Wednesday of each week when they would maintain a vegetarian diet.

Demographics


Gender

A 1992 market research study conducted by the Yankelovich research organisation claimed that "of the 12.4 million people [in the US] who call themselves vegetarian, 68 percent are female while only 32 percent are male."

Some studies show that vegetarian women are much more likely to have female babies. A study of 6,000 pregnant women in 1998 "found that while the national average in Britain is 106 boys born to every 100 girls, for vegetarian mothers the ratio was just 85 boys to 100 girls." This research was dismissed by Catherine Collins, of the British Dietetic Association, as a "statistical fluke".

There is some speculation that diets high in soy, due to high isoflavone
Isoflavone

Isoflavones comprise a class of organic compounds, often naturally occurring, related to the flavonoids. Many act as phytoestrogens in mammals. Being polyphenols, they are antioxidants....
 content, can have a feminising effect on humans due to the phytoestrogens
Phytoestrogens

Phytoestrogens, sometimes called "dietary estrogens", are a diverse group of naturally occurring non steroidal plant compounds that, because of their structural similarity with estradiol , have the ability to cause estrogenic or/and antiestrogenic effects....
 contained. Proponents of this theory claim that diets high in isoflavones promote earlier onset of female puberty and delayed male puberty. However, a 2001 study conducted by the University of Pennsylvania
University of Pennsylvania

The University of Pennsylvania is a private research university located in Philadelphia, Pennsylvania, United States. Penn is America's first university and is the fourth-oldest institution of higher education in the United States....
 found no significant differences in the later onset of puberty between infants raised on soy-based formula and cow milk formula.

Country-specific information

Vegetarianism is viewed in different ways around the world. In some areas there is cultural and even legal support, but in others the diet is poorly understood or even frowned upon. In many countries food labelling is in place that makes it easier for vegetarians to identify foods compatible with their diets.

In India, not only is there food labelling, but many restaurants are marketed and signed as being either "Vegetarian" or "Non-Vegetarian". People who are vegetarian in India are usually Lacto-vegetarians
Lacto vegetarianism

A lactovegetarian diet is a vegetarianism diet which includes dairy products such as milk, cheese, yogurt, butter, cream, and kefir but excludes eggs....
, and therefore, to cater for this market, the majority of vegetarian restaurants in India do serve dairy products while eschewing egg products. Most Western vegetarian restaurants, in comparison, do serve eggs and egg-based products.

See also

  • Vegetarian cuisine
    Vegetarian cuisine

    Vegetarian cuisine refers to food that meets Vegetarianism by excluding meat and animal tissue products. For lacto-ovo vegetarianism , Egg and dairy products such as milk and cheese are permitted....
  • List of diets
    List of diets

    Well-known Diet s:...
  • List of vegetarians
    List of vegetarians

    This is a list of notable people who are known to be vegetarians, listed by order of nationality name....
  • Veganism
    Veganism

    Veganism is a diet and lifestyle that seeks to exclude the use of animals for food, clothing, or any other purpose. Vegans endeavor not to use or consume animal products of any kind....
  • Vegetarian or vegan cat food
    Cat food

    Cat food is formulated to address the specific nutritional requirements of cats. Although cats are Carnivore#Obligate carnivores, most commercial cat food contains both animal and plant material, supplemented with vitamins, minerals and other nutrients....


External links