|Description||A vegetarian diet is derived from plants, with or without eggs or dairy.|
|Origins||Ancient India, ancient Greece; 6th century BCE and earlier|
|Varieties||Ovo, lacto, ovo-lacto, veganism, raw veganism, fruitarianism, Buddhist vegetarianism, Jain vegetarianism|
Vegetarianism is the practice of abstaining from the consumption of meat – red meat, poultry, seafood and the flesh of any other animal; it may also include abstention from by-products of animal slaughter.
Vegetarianism can be adopted for different reasons. Many object to eating meat out of respect for sentient life. Such ethical motivations have been codified under various religious beliefs, along with the concept of animal rights. Other motivations for vegetarianism are health-related, political, environmental, cultural, aesthetic or economic. There are varieties of the diet as well: an ovo-vegetarian diet includes eggs but not dairy products, a lacto-vegetarian diet includes dairy products but not eggs, and an ovo-lacto vegetarian diet includes both eggs and dairy products. A vegan, or strict vegetarian, diet excludes all animal products, including eggs, dairy, beeswax and honey. Some vegans also avoid animal products such as leather for clothing and goose-fat for shoe polish.
Various packaged or processed foods, including cake, cookies, candies, chocolate, yogurt and marshmallows, often contain unfamiliar animal ingredients, and may be a special concern for vegetarians due to the likelihood of such additions. Often, products are reviewed by vegetarians for animal-derived ingredients prior to purchase or consumption. Vegetarians vary in their feelings regarding these ingredients, however. For example, while some vegetarians may be unaware of animal-derived rennet's role in the usual production of cheese and may therefore unknowingly consume the product, other vegetarians may not take issue with its consumption.
Semi-vegetarian diets consist largely of vegetarian foods, but may include fish or poultry, or sometimes other meats, on an infrequent basis. Those with diets containing fish or poultry may define meat only as mammalian flesh and may identify with vegetarianism. A pescetarian diet has been described as "fish but no other meat". The common use association between such diets and vegetarianism has led vegetarian groups such as the Vegetarian Society to state that diets containing these ingredients are not vegetarian, due to fish and birds being animals.
- 1 Etymology
- 2 History
- 3 Varieties of vegetarianism
- 4 Health effects
- 5 Ethics and diet
- 6 Religion and diet
- 7 Environment and diet
- 8 Labor conditions and diet
- 9 Economics and diet
- 10 Demographics
- 11 See also
- 12 Notes
- 13 References
- 14 External links
The word vegetarian is on record since 1839, referring to what was previously just described as "vegetable diet". It is a compound of vegetable and the suffix -arian (as in agrarian). The term was popularised with the foundation of the Vegetarian Society in Manchester, UK in 1847. The earliest occurrences of the term seem to be related to Alcott House, a school on the north side of Ham Common, London, opened in July 1838 by James Pierrepont Greaves, from 1841 known as A Concordium, or Industry Harmony College, from which time the institution began to publish its own pamphlet "The Healthian", which provides some of the earliest occurrences of the term "vegetarian".
The earliest records of (lacto) vegetarianism come from ancient India and ancient Greece in the 5th century BCE. In the Asian instance the diet was closely connected with the idea of nonviolence towards animals (called ahimsa in India) and was promoted by religious groups and philosophers. Among the Hellenes, Egyptians and others, it had medical or Ritual purification purposes.
"Twenty-six years after my coronation various animals were declared to be protected – parrots, mainas, aruna, ruddy geese, wild ducks, nandimukhas, gelatas, bats, queen ants, terrapins, boneless fish, vedareyaka, gangapuputaka, sankiya fish, tortoises, porcupines, squirrels, deer, bulls, okapinda, wild asses, wild pigeons, domestic pigeons and all four-footed creatures that are neither useful nor edible. Those nanny goats, ewes and sows which are with young or giving milk to their young are protected, and so are young ones less than six months old. Cocks are not to be caponized, husks hiding living beings are not to be burnt and forests are not to be burnt either without reason or to kill creatures. One animal is not to be fed to another." —Edicts of Ashoka, Fifth Pillar
Following the Christianisation of the Roman Empire in late antiquity, vegetarianism practically disappeared from Europe as it was in other Continents, except India. Several orders of monks in medieval Europe restricted or banned the consumption of meat for ascetic reasons, but none of them eschewed fish. (The medieval definition of "fish" included such animals as seals, porpoises, dolphins, barnacle geese, puffins, and beavers.)
It re-emerged during the Renaissance, becoming more widespread in the 19th and 20th centuries. In 1847, the first Vegetarian Society was founded in the United Kingdom; Germany, the Netherlands, and other countries followed. The International Vegetarian Union, a union of the national societies, was founded in 1908. In the Western world, the popularity of vegetarianism grew during the 20th century as a result of nutritional, ethical, and more recently, environmental and economic concerns.
Varieties of vegetarianism
There are a number of types of vegetarianism, which exclude or include various foods.
- Ovo vegetarianism includes eggs but not dairy products.
- Lacto vegetarianism includes dairy products but not eggs.
- Ovo-lacto vegetarianism (or lacto-ovo vegetarianism) includes animal/dairy products such as eggs, milk, and honey.
- Veganism excludes all animal flesh and products, such as milk, honey, and eggs, as well as items refined or manufactured through any such product, such as bone-char refined white sugar or animal-tested baking soda.
- Raw veganism includes only fresh and uncooked fruit, nuts, seeds, and vegetables. Vegetables can only be cooked up to a certain temperature.
- Fruitarianism permits only fruit, nuts, seeds, and other plant matter that can be gathered without harming the plant.
- Sattvic diet (also known as yogic diet), a plant based diet which may also include dairy (not eggs) and honey, but excludes anything from the onion or leek family, red lentils, durian fruit, mushrooms, blue cheeses, fermented foods or sauces, alcoholic drinks and often also excludes coffee, black or green tea, chocolate, nutmeg or any other type of stimulant such as excess sharp spices.
- Buddhist vegetarianism. Different Buddhist traditions have differing teachings on diet, which may also vary for ordained monks and nuns compared to others. Many interpret the precept 'not to kill' to require abstinence from meat, but not all. In Taiwan, su vegetarianism excludes not only all animal products but also vegetables in the allium family (which have the characteristic aroma of onion and garlic): onion, garlic, scallions, leeks, chives, or shallots.
- Jain vegetarianism includes dairy but excludes eggs and honey, as well as root vegetables.
- Macrobiotic diets consist mostly of whole grains and beans.
Some vegetarians also avoid products that may use animal ingredients not included in their labels or which use animal products in their manufacturing; for example, sugars that are whitened with bone char, cheeses that use animal rennet (enzymes from animal stomach lining), gelatin (derived from the collagen inside animals' skin, bones and connective tissue), some cane sugar (but not beet sugar) and apple juice/alcohol clarified with gelatin or crushed shellfish and sturgeon, while other vegetarians are unaware of or do not mind such ingredients.
Individuals may label themselves "vegetarian" while practicing a semi-vegetarian diet, as some dictionary definitions describe vegetarianism as including the consumption of fish, or only include mammalian flesh as part of their definition of meat, while other definitions exclude fish and all animal flesh. In other cases, individuals may describe themselves as "flexitarian". These diets may be followed by those who reduce animal flesh consumed as a way of transitioning to a complete vegetarian diet or for health, ethical, environmental, or other reasons. Semi-vegetarian diets include:
- Pescetarianism, which includes fish and possibly other forms of seafood;
- Pollotarianism, which includes chicken and possibly other poultry;
- "Pollo-pescetarian", which includes poultry and fish, or "white meat" only;
- Macrobiotic diet consisting mostly of whole grains and beans, but may sometimes include fish.
Semi-vegetarianism is contested by vegetarian groups, such as the Vegetarian Society, who state that vegetarianism excludes all animal flesh.
Scientific endeavors in the area of vegetarianism have shifted from concerns about nutritional adequacy to investigating health benefits and disease prevention. The Academy of Nutrition and Dietetics and Dietitians of Canada have stated that at all stages of life, a properly planned vegetarian diet is "healthful, nutritionally adequate, and provides health benefits in the prevention and treatment of certain diseases". Large-scale studies have shown that mortality from ischaemic heart disease was 30% lower among vegetarian men and 20% lower among vegetarian women than in non-vegetarians. Vegetarian diets offer lower levels of saturated fat, cholesterol and animal protein, and higher levels of carbohydrates, fibre, magnesium, potassium, folate, and antioxidants such as vitamins C and E and phytochemicals.
Vegetarians tend to have lower body mass index, lower levels of cholesterol, lower blood pressure, and less incidence of heart disease, hypertension, type 2 diabetes, renal disease, metabolic syndrome, dementias such as Alzheimer's disease and other disorders. Non-lean red meat, in particular, has been found to be directly associated with increased risk of cancers of the esophagus, liver, colon, and the lungs. Other studies have shown no significant differences between vegetarians and non-vegetarians in mortality from cerebrovascular disease, stomach cancer, colorectal cancer, breast cancer, or prostate cancer. A 2010 study compared a group of vegetarian and meat-eating Seventh-day Adventists in which vegetarians scored lower on depression tests and had better mood profiles.
The relationship between vegetarian diet and bone health remains unclear. According to some studies, a vegetarian lifestyle can be associated with vitamin B12 deficiency and low bone mineral density. However, a study of vegetarian and non-vegetarian adults in Taiwan found no significant difference in bone mineral density between the two groups. Other studies, exploring animal protein's negative effects on bone health, suggest that vegetarians may be less prone to osteoporosis than omnivores, as vegetarian subjects had greater bone mineral density and more bone formation.
The China-Cornell-Oxford Project, a 20-year study conducted by Cornell University, the University of Oxford, and the government of China has established a correlation between the consumption of animal products and a variety of chronic illnesses, such as coronary heart disease, diabetes, and cancers of the breast, prostate and bowel (see The China Study).
Western vegetarian diets are typically high in carotenoids, but relatively low in omega-3 fatty acids and vitamin B12. Vegans can have particularly low intake of vitamin B and calcium if they do not eat enough items such as collard greens, leafy greens, tempeh and tofu (soy). High levels of dietary fiber, folic acid, vitamins C and E, and magnesium, and low consumption of saturated fat are all considered to be beneficial aspects of a vegetarian diet.
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 at Harvard University as well as other studies conducted in the United States, United Kingdom, Canada, Australia, New Zealand and various European countries, confirmed vegetarian diets provide 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 ovo-lacto vegetarian, several vegetable sources have significant amounts of all eight types of essential amino acids, including lupin beans, soy, hempseed, chia seed, amaranth, buckwheat, pumpkin seeds spirulina, pistachios, and quinoa. However, 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 and beans, or hummus and whole wheat pita, though protein combining in the same meal is not necessary). A 1994 study found a varied intake of such sources can be adequate.
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. According to the Vegetarian Resource Group, consuming food that contains vitamin C, such as citrus fruit or juices, tomatoes, or broccoli, is a good way to increase the amount of iron absorbed at a meal. Vegetarian foods rich in iron include black beans, cashews, hempseed, kidney beans, broccoli, lentils, oatmeal, raisins, spinach, cabbage, lettuce, black-eyed peas, soybeans, many breakfast cereals, sunflower seeds, chickpeas, tomato juice, tempeh, molasses, thyme, and whole-wheat bread. The related 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 a few small studies report very high rates of iron deficiency (up to 40%, and 58% of the respective vegetarian or vegan groups). However, the American Dietetic Association states that iron deficiency is no more common in vegetarians than non-vegetarians (adult males are rarely iron deficient); iron deficiency anaemia is rare no matter the diet.
According to the United States National Institutes of Health, vitamin B12 is not generally present in plants and is naturally found in foods of animal origin. Lacto-ovo vegetarians can obtain B12 from dairy products and eggs, and vegans can obtain it from fortified foods (including some soy products and some breakfast cereals) and dietary supplements. Vitamin B12 can also be obtained from fortified yeast extract products.
The recommended dietary allowance of B12 in the United States is, per day, 0.4 mcg (0–6 months), rising to 1.8 mcg (9–13 years), 2.4 mcg (14+ years), and 2.8 mcg (lactating female). While the body's daily requirement for vitamin B12 is very small, deficiency of the vitamin is very serious leading to anemia and irreversible nerve damage.
Plant-based, or vegetarian, sources of Omega 3 fatty acids include soy, walnuts, pumpkin seeds, canola oil, kiwifruit, hempseed, algae, chia seed, flaxseed, echium seed and leafy vegetables such as lettuce, spinach, cabbage and purslane. Purslane contains more Omega 3 than any other known leafy green. Olives (and olive oil) are another important plant source of unsaturated fatty acids. Plant foods can provide alpha-linolenic acid which the human body uses to synthesize the long-chain n-3 fatty acids EPA and DHA. EPA and DHA can be obtained directly in high amounts from oily fish or fish oils. 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.[clarification needed] 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 such as spirulina are good sources of gamma-linolenic acid (GLA), alpha-linolenic acid (ALA), linoleic acid (LA), stearidonic acid (SDA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA).
Calcium 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. Some significant sources of calcium include broccoli, beans, peas, lentils, cabbage, lettuce, collard greens, bok choy, kale, and turnip greens. Spinach, swiss chard and beet greens are high in calcium, but the calcium is bound to oxalate and therefore it is poorly absorbed.
Vitamin D needs can be met via the human body's own generation upon sufficient and sensible exposure to ultraviolet (UV) light in sunlight. Products including milk, soy milk and cereal grains may be fortified to provide a source of Vitamin D For those who do not get adequate sun exposure and/or food sources, Vitamin D supplementation may be necessary.
- Fungus, from USDA nutrient database:
- Mushrooms, portabella, exposed to ultraviolet light, raw: Vitamin D2: 11.2 μg (446 IU)
- Mushrooms, portabella, exposed to ultraviolet light, grilled: Vitamin D2: 13.1 μg (524 IU)
- Mushrooms, shiitake, dried: Vitamin D2: 3.9 μg (154 IU)
- Mushrooms, shiitake, raw: Vitamin D2: 0.4 μg (18 IU)
- Mushrooms, portabella, raw: Vitamin D2: 0.3 μg (10 IU)
- Mushroom powder, any species, illuminated with sunlight or artificial ultraviolet light sources
Vitamin D2, or ergocalciferol is found in fungus (except alfalfa which is a plantae) and created from viosterol, which in turn is created when ultraviolet light activates ergosterol (which is found in fungi and named as a sterol from ergot). Any UV-irradiated fungus including yeast form vitamin D2. Human bioavailability of vitamin D2 from vitamin D2-enhanced button mushrooms via UV-B irradiation is effective in improving vitamin D status and not different from a vitamin D2 supplement according to study. For example, Vitamin D2 from UV-irradiated yeast baked into bread is bioavailable. By visual assessment or using a chromometer, no significant discoloration of irradiated mushrooms, as measured by the degree of "whiteness", was observed making it hard to discover if they have been treated without labeling. Claims have been made that a normal serving (approx. 3 oz or 1/2 cup, or 60 grams) of mushrooms treated with ultraviolet light increase their vitamin D content to levels up to 80 micrograms, or 2700 IU if exposed to just 5 minutes of UV light after being harvested.
A 1999 metastudy combined data from five studies from western countries. The metastudy reported mortality ratios, where lower numbers indicated fewer deaths, for fish eaters to be 0.82, vegetarians to be 0.84, occasional meat eaters (eat meat less than once per week) to be 0.84. Regular meat eaters had the base mortality rate of 1.0, while the number for vegans was very uncertain (anywhere between 0.7 and 1.44) due to too few data points. The study reported the numbers of deaths in each category, and expected error ranges for each ratio, and adjustments made to the data. However, the "lower mortality was due largely to the relatively low prevalence of smoking in these [vegetarian] cohorts". Out of the major causes of death studied, only one difference in mortality rate was attributed to the difference in diet, as the conclusion states: "...vegetarians had a 24% lower mortality from ischaemic heart disease than non-vegetarians, but no associations of a vegetarian diet with other major causes of death were established".
In Mortality in British vegetarians, a similar conclusion is drawn: "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 Studies is ongoing research that documents the 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 of California Adventists surviving to age 30 was 83.3 years for men and 85.7 years for women.
The Adventist health study is again incorporated into a metastudy titled "Does low meat consumption increase life expectancy in humans?" published in American Journal of Clinical Nutrition, which concluded that low meat eating (less than once per week) and other lifestyle choices significantly increase 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 with regional areas and local diets in Europe also have found life expectancy considerably greater in southern France, where a low meat, high plant Mediterranean diet is common, than northern France, where a diet with high meat content is more common.
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 non-vegetarians. Carboxymethyllysine is a glycation product which represents "a general marker of oxidative stress and long-term damage of proteins in aging, atherosclerosis and diabetes" and "[a]dvanced glycation end products (AGEs) may play an important adverse role in process of atherosclerosis, diabetes, aging and chronic renal failure".
In Western medicine, patients are sometimes advised to adhere to a vegetarian diet. Vegetarian diets have been used as a treatment for rheumatoid arthritis, but the evidence is inconclusive whether this is effective. Certain alternative medicines, such as Ayurveda and Siddha, prescribe a vegetarian diet as a normal procedure. Maya Tiwari notes that Ayurveda recommends small portions of meat for some people, though "the rules of hunting and killing the animal, practiced by the native peoples, were very specific and detailed". Now that such methods of hunting and killing are not observed, she does not recommend the use of "any animal meat as food, not even for the Vata types".
Humans are omnivorous, capable of consuming a wide variety of plant and animal material. 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.
Animal-to-human disease transmissions
The consumption of meat can cause a transmission of a number of diseases from animals to humans. The connection between infected animal and human illness is well established in the case of salmonella; an estimated one-third to one-half of all chicken meat marketed in the United States is contaminated with salmonella. Only recently, however, have scientists begun to suspect that there is a similar connection between animal meat and human cancer, birth defects, mutations, and many other diseases in humans. The rate of disease among chickens is so high that the Department of Labor has ranked the poultry industry as one of the most hazardous occupations. 20% of all cows are afflicted with a variety of cancer known as bovine leukemia virus (BLV). Studies have increasingly linked BLV with HTLV-1, the first human retrovirus discovered to cause cancer. Scientists have found that a bovine immunodeficiency virus (BIV), the equivalent of the AIDS virus in cows, can also infect human cells. It is supposed that BIV may have a role in the development of a number of malignant or slow viruses in humans.[clarification needed]
The proximity of animals in industrial-scale animal farming leads to an increased rate of disease transmission.
Transmission of animal influenza viruses to humans has been documented, but illness from such cases is rare compared to that caused by the now common human-adapted older influenza viruses, transferred from animals to humans in the more distant past.[nb 1] The first documented case was in 1959, and in 1998, 18 new human cases of H5N1 influenza were diagnosed, in which six people died. In 1997 more cases of H5N1 avian influenza were found in chickens in Hong Kong.
Whether tuberculosis originated in cattle and was then transferred to humans, or diverged from a common ancestor infecting a different species, is currently unclear. The strongest evidence for a domestic-animal origin exists for measles and pertussis, although the data do not exclude a non-domestic origin.
According to the 'Hunter Theory', the "simplest and most plausible explanation for the cross-species transmission" the AIDS virus was transmitted from a chimpanzee to a human when a bushmeat hunter was bitten or cut while hunting or butchering an animal.
Historian Norman Cantor suggests the Black Death might have been a combination of pandemics including a form of anthrax, a cattle murrain. He cites many forms of evidence including the fact that meat from infected cattle was known to have been sold in many rural English areas prior to the onset of the plague.
The American Dietetic Association indicates that vegetarian diets may be more common among adolescents with eating disorders but that the evidence suggests that the adoption of a vegetarian diet does not lead to eating disorders, rather that "vegetarian diets may be selected to camouflage an existing eating disorder". Other studies and statements by dietitians and counselors support this conclusion.[nb 2]
Ethics and diet
Various ethical reasons have been suggested for choosing vegetarianism, usually predicated on the interests of non-human animals. In many societies, controversy and debate have arisen over the ethics of eating animals. Some people, while not vegetarians, refuse to eat the flesh of certain animals due to cultural taboo, such as cats, dogs, horses or rabbits. Others support meat eating for scientific, nutritional and cultural reasons, including religious ones. Some meat eaters abstain from the meat of animals reared in particular ways, such as factory farms, or avoid certain meats, such as veal or foie gras. Some people follow vegetarian or vegan diets not because of moral concerns involving the raising or consumption of animals in general, but because of concerns about the specific treatment and practises involved in the raising and slaughter of animals, i.e. factory farming and the industrialisation of animal slaughter. Others still avoid meat because meat production is claimed to place a greater burden on the environment than production of an equivalent amount of plant protein.
Ethical objections based on consideration for animals are generally divided into opposition to the act of killing in general, and opposition to certain agricultural practices surrounding the production of meat.
Ethics of killing for food
Princeton University professor and founder of the animal rights movement, Peter Singer, believes that if alternative means of survival exist, one ought to choose the option that does not cause unnecessary harm to animals. Most ethical vegetarians argue that the same reasons exist against killing animals to eat as against killing humans to eat. Singer, in his book Animal Liberation listed possible qualities of sentience in non-human creatures that gave such creatures the scope to be considered under utilitarian ethics, and this has been widely referenced by animal rights campaigners and vegetarians. Ethical vegetarians also believe that killing an animal, like killing a human, can only be justified in extreme circumstances and that consuming a living creature for its enjoyable taste, convenience, or nutritional value is not sufficient cause. Another common view is that humans are morally conscious of their behaviour in a way other animals are not, and therefore subject to higher standards.
Opponents of ethical vegetarianism argue that animals are not moral equals to humans and so consider the comparison of eating livestock with killing people to be fallacious. This view does not excuse cruelty, but maintains that animals do not possess the rights a human has.
Milk and eggs
One of the main differences between a vegan and a typical vegetarian diet is the avoidance of both eggs and dairy products such as milk, cheese, butter and yogurt. Ethical vegans do not consume dairy or eggs because they state that their production causes the animal suffering and/or a premature death.
To produce milk from dairy cattle, calves are separated from their mothers soon after birth and slaughtered or fed milk replacer in order to retain the cows milk for human consumption. Vegans state that this breaks the natural mother and calf bond. Unwanted male calves are either slaughtered at birth or sent for veal production. To prolong lactation, dairy cows are almost permanently kept pregnant through artificial insemination. After about five years, once the cows milk production has dropped, they are considered "spent" and sent to slaughter for hamburger meat and their hides. A dairy cow's natural life expectancy is about twenty years.
Treatment of animals
Ethical vegetarianism has become popular in developed countries particularly because of the spread of factory farming, faster communications, and environmental consciousness. Some believe that the current mass demand for meat cannot be satisfied without a mass-production system that disregards the welfare of animals, while others believe that practices like well-managed free-ranging and consumption of game, particularly from species whose natural predators have been significantly eliminated, could substantially alleviate the demand for mass-produced meat.
Classical Greek and Roman philosophy
Ancient Greek philosophy has a long tradition of vegetarianism. Pythagoras was reportedly vegetarian (and studied at Mt. Carmel, where some historians say there was a vegetarian community), as his followers were expected to be.
Roman writer Ovid concluded his magnum opus Metamorphoses, in part, with the impassioned argument (uttered by the character of Pythagoras) that in order for humanity to change, or metamorphose, into a better, more harmonious species, it must strive towards more humane tendencies. He cited vegetarianism as the crucial decision in this metamorphosis, explaining his belief that human life and animal life are so entwined that to kill an animal is virtually the same as killing a fellow human.
Everything changes; nothing dies; the soul roams to and fro, now here, now there, and takes what frame it will, passing from beast to man, from our own form to beast and never dies...Therefore lest appetite and greed destroy the bonds of love and duty, heed my message! Abstain! Never by slaughter dispossess souls that are kin and nourish blood with blood!
Religion and diet
Jainism teaches vegetarianism as moral conduct as do some major sects of Hinduism. Buddhism in general does not prohibit meat eating, while Mahayana Buddhism encourages vegetarianism as beneficial for developing compassion. Other denominations that advocate a vegetarian diet include the Seventh-day Adventists, the Rastafari movement, the Ananda Marga movement and the Hare Krishnas. Sikhism does not equate spirituality with diet and does not specify a vegetarian or meat diet.
While there are no dietary restrictions in the Bahá'í Faith, `Abdu'l-Bahá, the son of the religion's founder, noted that a vegetarian diet consisting of fruits and grains was desirable, except for people with a weak constitution or those that are sick. He stated that there are no requirements that Bahá'ís become vegetarian, but that a future society should gradually become vegetarian. `Abdu'l-Bahá also stated that killing animals was contrary to compassion. While Shoghi Effendi, the head of the Bahá'í Faith in the first half of the 20th century, stated that a purely vegetarian diet would be preferable since it avoided killing animals, both he and the Universal House of Justice, the governing body of the Bahá'ís have stated that these teachings do not constitute a Bahá'í practice and that Bahá'ís can choose to eat whatever they wish but should be respectful of others' beliefs.
Theravadins in general eat meat. 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. However, this does not include eating meat which was given as alms or commercially purchased. In the Theravada canon, Buddha did not make any comment discouraging them from eating meat (except specific types, such as human, elephant, horse, dog, snake, lion, tiger, leopard, bear, and hyena flesh) but he specifically refused to institute vegetarianism in his monastic code when a suggestion had been made.
In several Sanskrit texts of Mahayana Buddhism, Buddha instructs his followers to avoid meat. However, each branch of Mahayana Buddhism selects which sutra to follow, and some branches, including the majority of Tibetan and Japanese Buddhists, do eat meat, while many Chinese Buddhist branches do not.
There is no specific teaching on diet in traditional Christianity—except that nothing is forbidden on religious principles. The eating of meat is neither encouraged nor discouraged. Christians have always been free to make their own decisions about what to eat; however, there are groups within Christianity that practice specific dietary restrictions for various reasons.
The early sect known as the Ebionites are considered to have practiced vegetarianism. Surviving fragments from their Gospel indicate their belief that – as Christ is the Passover sacrifice and eating the Passover lamb is no longer required – a vegetarian diet may (or should) be observed. However, orthodox Christianity does not accept their teaching as authentic. Indeed, their specific injunction to strict vegetarianism was cited as one of the Ebionites' "errors".
At a much later time, the Bible Christian Church founded by Reverend William Cowherd in 1809 followed a vegetarian diet. Cowherd was one of the philosophical forerunners of the Vegetarian Society. Cowherd encouraged members to abstain from eating of meat as a form of temperance.
Seventh-day Adventists are encouraged to engage in healthy eating practices, and ova-lacto-vegetarian diets are recommended by the General Conference of Seventh-day Adventists Nutrition Council (GCNC). They have also sponsored and participated in many scientific studies exploring the impact of dietary decisions upon health outcomes. The GCNC has in addition adapted the USDA's food pyramid for a vegetarian dietary approach. However, the only kinds of meat specifically frowned upon by the SDA health message are unclean meats, or those forbidden in scripture.
Additionally, some monastic orders follow a vegetarian diet, and members of the Orthodox Church follow a vegan diet during fasts. There is also a strong association between the Quakers and vegetarianism dating back at least to the 18th century. The association grew in prominence during the 19th century, coupled with growing Quaker concerns in connection with alcohol consumption, vivisection and social purity. The association between the Quaker tradition and vegetarianism, however, becomes most significant with the founding of the Friends' Vegetarian Society in 1902 "to spread a kindlier way of living amongst the Society of Friends."
According to Canon Law, Roman Catholics are required to abstain from meat (defined as all animal flesh excluding water animals) on Ash Wednesday, Good Friday, all Fridays of Lent, and all other Fridays (subject to the local bishop) as an act of penance.
Paths of Hinduism hold vegetarianism as an ideal. There are three main reasons for this: the principle of nonviolence (ahimsa) applied to animals; the intention to offer only "pure" (vegetarian) food to a deity and then to receive it back as prasad; and the conviction that a sentient diet is beneficial for a healthy body and mind and that non-vegetarian food is detrimental for the mind and for spiritual development.
Followers of Islam, or 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 become vegetarian for non-medical reasons can sometimes be controversial. Though some more traditional Muslims may keep quiet about their vegetarian diet, the number of vegetarian Muslims is increasing.
Vegetarianism has been practiced by some influential Muslims including the Iraqi theologian, female mystic and poet Râbi‘ah al-‘Adawîyah of Basrah, who died in the year 801, and the Sri Lankan Sufi master Bawa Muhaiyaddeen who established The Bawa Muhaiyaddeen Fellowship of North America in Philadelphia. The former Indian president Dr. A. P. J. Abdul Kalam is also famously a vegetarian.
In January 1996, The International Vegetarian Union announced the formation of the Muslim Vegetarian/Vegan Society.
Many non-vegetarian Muslims will select vegetarian (or seafood) options when dining in non-halal restaurants. However, this is a matter of not having the right kind of meat rather than preferring not to eat meat on the whole.
Followers of Jainism believe that all living organisms whether they are micro-organism are living and have a soul, and have one or more senses out of five senses and they go to great lengths to minimise any harm to any living organism. Most Jains are lacto-vegetarians but more devout Jains do not eat root vegetables because they believe that root vegetables contain a lot more micro-organisms as compared to other vegetables, and that, by eating them, violence of these micro-organisms is inevitable. So they focus on eating beans and fruits, whose cultivation do not involve killing of a lot of micro-organisms. No products obtained from dead animals are allowed, because when a living beings dies, a lot of micro-organisms (called as decomposers) will reproduce in the body which decomposes the body, and in eating the dead bodies, violence of decomposers is inevitable. Jain monks usually do a lot of fasting, and when they knew through spiritual powers that their life is very little, they start fasting until death. Some particularly dedicated individuals are fruitarians. Honey is forbidden, because honey is a collection of eggs, excreta, dead bees, and saliva of 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.
While it is neither required nor prohibited for Jews to eat meat, a number of medieval scholars of Jewish religion (e.g., Joseph Albo and Isaac Arama) regard vegetarianism as a moral ideal, not just because of a concern for the welfare of animals, but because the slaughter of animals might cause the individual who performs such acts to develop negative character traits. One modern-day scholar who is in favour of vegetarianism is the late Rabbi Abraham Isaac Kook, the Chief Rabbi of Mandate Palestine. 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, as all humans and animals were originally commanded by God to only eat plants. In context, Rabbi Kook makes those comments in his portrayal of the eschatological (messianic) era. However, he personally refrained from eating meat except on the Sabbath and Festivals, and one of his leading disciples, Rabbi David Cohen, known as the "Nazirite" of Jerusalem, was a devout vegetarian. Several other members of Rabbi Kook's circle were also vegetarians.
According to some Kabbalists, 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 permission to eat meat is a temporary leniency for those who are not ready yet to accept the vegetarian diet.
 Jewish law also commands people to ritually slaughter animals when killing them, and goes into precise detail on the rituals of both animal sacrifice and ordinary slaughter (shechita). According to medieval sage Rabbi Shlomo Ephraim Luntschitz, author of the Torah commentary Kli Yakar, the complexity of these laws was intended to discourage the consumption of meat.
Within the Afro-Caribbean community, a minority are Rastafari and follow the dietary regulations with varying degrees of strictness. The most orthodox eat only "Ital" or natural foods, in which the matching of herbs or spices with vegetables is the result of long tradition originating from the African ancestry and cultural heritage of Rastafari. Most Rastafari are vegetarian.
The tenets of Sikhism do not advocate a particular stance on either vegetarianism or the consumption of meat, but leave the decision of diet to the individual. The tenth guru, Guru Gobind Singh, however, prohibited "Amritdhari" Sikhs, or those that follow the Sikh Rehat Maryada (the Official Sikh Code of Conduct) from eating Kutha meat, or meat which has been obtained from animals which have been killed in a ritualistic way . This is understood to have been for the political reason of maintaining independence from the then-new Muslim hegemony, as Muslims largely adhere to the ritualistic halal diet.
"Amritdharis" that belong to some Sikh sects (e.g. Akhand Kirtani Jatha, Damdami Taksal, Namdhari and Rarionwalay, etc.) are vehemently against the consumption of meat and eggs (though they do consume and encourage the consumption of milk, butter and cheese). This vegetarian stance has been traced back to the times of the British Raj, with the advent of many new Vaishnava converts. In response to the varying views on diet throughout the Sikh population, Sikh Gurus have sought to clarify the Sikh view on diet, stressing their preference only for simplicity of diet. Guru Nanak said that over-consumption of food (Lobh, Greed) involves a drain on the Earth's resources and thus on life. Passages from the Guru Granth Sahib (the holy book of Sikhs, also known as the Adi Granth) say that it is "foolish" to argue for the superiority of animal life, because though all life is related, only human life carries more importance: "Only fools argue whether to eat meat or not. Who can define what is meat and what is not meat? Who knows where the sin lies, being a vegetarian or a non-vegetarian?" The Sikh langar, or free temple meal, is largely lacto-vegetarian, though this is understood to be a result of efforts to present a meal that is respectful of the diets of any person who would wish to dine, rather than out of dogma.
Environment and diet
Environmental vegetarianism is based on the concern that the production of meat and animal products for mass consumption, especially through factory farming, is environmentally unsustainable. According to a 2006 United Nations initiative, the livestock industry is one of the largest contributors to environmental degradation worldwide, and modern practices of raising animals for food contribute 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 is a large source of greenhouse gases. According to a 2006 report it is responsible for 18% of the world's greenhouse gas emissions as estimated in 100-year CO2 equivalents. Livestock sources (including enteric fermentation and manure) account for about 3.1 percent of US anthropogenic GHG emissions expressed as carbon dioxide equivalents. This EPA estimate is based on methodologies agreed to by the Conference of Parties of the UNFCCC, with 100-year global warming potentials from the IPCC Second Assessment Report used in estimating GHG emissions as carbon dioxide equivalents.
Meat produced in a laboratory (called in vitro meat) may be more environmentally sustainable than regularly produced meat. Reactions of vegetarians vary. Rearing a relatively small number of grazing animals can be beneficial, as the Food Climate Research Network at Surrey University reports: "A little bit of livestock production is probably a good thing for the environment.
In May 2009, Ghent, Belgium, was reported to be "the first [city] in the world to go vegetarian at least once a week" for environmental reasons, when local authorities decided to implement a "weekly meatless day". Civil servants would eat vegetarian meals one day per week, in recognition of the United Nations' report. Posters were put up by local authorities to encourage the population to take part on vegetarian days, and "veggie street maps" were printed to highlight vegetarian restaurants. In September 2009, schools in Ghent are due to have a weekly veggiedag ("vegetarian day") too.
Labor conditions and diet
Some groups, such as PETA, 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 assigning difficult and distressing tasks without adequate counselling, training and debriefing. However, the working conditions of agricultural workers as a whole, particularly non-permanent workers, remain poor and well below conditions prevailing in other economic sectors. Accidents, including pesticide poisoning, among farmers and plantation workers contribute to increased health risks, including increased mortality. According to the International Labour Organization, agriculture is one of the three most dangerous jobs in the world.
Economics and diet
Similar to environmental vegetarianism is the concept of economic vegetarianism. 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 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."
A research study conducted on more than 8,000 people, and published in the British Medical Journal, suggested that children with an above-average IQ may have a higher chance of becoming vegetarians in their adulthood. Vegetarians had an average childhood IQ of 105 compared with 100 for non-vegetarians. No difference in IQ score was found between strict vegetarians and those who reported eating fish or chicken.
Prejudice researcher Gordon Hodson observes that vegetarians and vegans frequently face discrimination because eating meat is held as a cultural norm, as do atheists and asexuals because religion and sex hold similar status.
A 1992 market research study conducted by the Yankelovich research organisation concluded that "of the 12.4 million people [in the US] who call themselves vegetarian, 68% are female, while only 32% are male".
At least one study indicates that vegetarian women are 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". Catherine Collins of the British Dietetic Association has dismissed this as a "statistical fluke" given that it is actually the male's genetic contribution which determines the sex of a baby.
- Sometimes a virus contains both avian-adapted genes and human adapted genes. Both the H2N2 and H3N2 pandemic strains contained avian flu virus RNA segments. "While the pandemic human influenza viruses of 1957 (H2N2) and 1968 (H3N2) clearly arose through reassortment between human and avian viruses, the influenza virus causing the 'Spanish flu' in 1918 appears to be entirely derived from an avian source (Belshe 2005)."
- Vesanto Melina, a British Columbian registered dietitian and author of Becoming Vegetarian, stresses there is no cause and effect relationship between vegetarianism and eating disorders, although people who have eating disorders may label themselves as vegetarians "so that they won't have to eat." Indeed, research indicates that the large majority of vegetarian or vegan anorexics and bulimics chose their diets after the onset of their disease. The "restricted" eating patterns of vegetarianism and veganism can legitimize the removal of numerous high-fat, energy-dense foods such as meat, eggs, cheese. However, the eating pattern chosen by those with anorexia or bulimia nervosa is far more restrictive than a healthful vegetarian diet, eliminating nuts, seeds, avocados, and limiting overall caloric intake.
- "Frequently Asked Questions – Definitions". International Vegetarian Union (IVU). Retrieved August 6, 2013.
- "What is a vegetarian?". The Vegetarian Society. Retrieved December 11, 2010.
- "Frequently Asked Questions - Ingredients 1: Gelatine". International Vegetarian Union (IVU). Retrieved February 7, 2013. "[S]ince the gelatin product is from hides or bones – not real flesh – and has undergone such significant changes, it is no longer considered 'fleishig' (meat) but 'pareve', and can be eaten with dairy products. ...Rennet is like gelatin in the sense that it's a common food additive but the foods containing it are often considered vegetarian."
- Forrest, Jamie (December 18, 2007). "Is Cheese Vegetarian?". Serious Eats. Retrieved July 9, 2010. "Some vegetarians are OK eating cheeses made with animal rennet, but many will seek out ones made with vegetarian rennet, especially since the latter are quite prevalent nowadays."
- "Things to look out for if you are a vegetarian/vegan". The Vegetarian Society. Retrieved December 11, 2010.
- Keevican, Michael. "What's in Your Cheese?". Vegetarian Resource Group. Retrieved December 10, 2010. "Many vegetarians don't consider that some of the cheeses they are eating could actually contain unfamiliar animal ingredients."
- "Frequently Asked Questions — Food Ingredients". Vegetarian Resource Group. Retrieved July 9, 2010. "One of the most frequently asked questions is: Why are some cheeses labeled as "vegetarian cheese"? Why wouldn't cheese be vegetarian? What is rennet?"
- Shorter Oxford English Dictionary (2002 and 2007) defines "vegetarian" (noun) as "A person who on principle abstains from animal food; esp. one who avoids meat but will eat dairy produce and eggs and sometimes also fish (cf. VEGAN noun)."
- Barr, Susan I.; Gwen E. Chapman (March 2002). "Perceptions and practices of self-defined current vegetarian and nonvegetarian women". Journal of the American Dietetic Association 102 (3): 354–360. doi:10.1016/S0002-8223(02)90083-0. PMID 11902368.
- Pescetarian, Merriam-Webster. Retrieved September 27, 2012.
- "Vegetarians don't eat fish, shellfish or crustacea, but they can still enjoy one of the healthiest diets available.". Vegetarian Society. Retrieved July 28, 2013.
- OED vol. 19, second edition (1989), p. 476; Webster’s Third New International Dictionary p. 2537; The Oxford Dictionary of English Etymology, Oxford, 1966, p. 972; The Barnhart Dictionary of Etymology (1988), p. 1196; Colin Spencer, The Heretic's Feast. A History of Vegetarianism, London 1993, p. 252. The OED writes that the word came into general use after the formation of the Vegetarian Society at Ramsgate in 1847, though it offers two examples of usage from 1839 and 1842:
- 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) The 1839 occurrence still is under discussion, The Oxford English Dictionary's 1839 source is in fact an 1863 publication: Fanny Kemble, Journal of a Residence on a Georgian Plantation 1838–1839. The original manuscript hasn't been located <http://www.ivu.org/history/kemble.html>.
- Extracts from some journals 1842-48 - the earliest known uses of the word 'vegetarian' Compiled by John Davis <http://www.ivu.org/history/vegetarian.html>.
- Spencer, Colin. The Heretic's Feast: A History of Vegetarianism. Fourth Estate Classic House, pp. 33–68, 69–84.
- Religious Vegetarianism From Hesiod to the Dalai Lama, ed. Kerry S. Walters and Lisa Portmess, Albany 2001, p. 13–46.
- Health goes dotty with brown eggs & green milk. Hinduonnet.com (September 5, 2001). Retrieved on January 6, 2011.
- Passmore John (1975). "The Treatment of Animals". Journal of the History of Ideas 36 (2): 196–201. doi:10.2307/2708924.
- Lutterbach, Hubertus. "Der Fleischverzicht im Christentum," Saeculum 50/II (1999) p. 202.
- Mortimer, Ian. "The Time Traveler's Guide to Medieval England," (2008) p. 184.
- Spencer p. 180–200.
- Spencer p. 252–253, 261–262.
- International Vegetarian Union (IVU). Retrieved May 2, 2010.
- Mangels, AR. Position of the American Dietetic Association: Vegetarian Diets, Journal of the American Dietetic Association, 2009, vol 109, issue 7, pp. 1266–1282.
- Yabroff, Jennie. "No More Sacred Cows", Newsweek, December 31, 2009.
- Gale, Catharine R. et al. "IQ in childhood and vegetarianism in adulthood: 1970 British cohort study", British Medial Journal, December 15, 2006, vol 333, issue 7581, p. 245.
- Meat: definition 2b, Merriam-Webster Online Dictionary, 2010. Retrieved January 5, 2010.
- "2003 Words of the Year". American Dialect Society. January 13, 2007. Retrieved September 27, 2012.
- DietaryGuidelines. (PDF) . Retrieved on 2011-05-25.
- Sabaté J., ed., Vegetarian Nutrition (Boca Raton:CRC Press), 2001.
- "Position of the American Dietetic Association: Vegetarian diets". July 2009. Retrieved November 18, 2012.
- Key et al. Mortality in vegetarians and non-vegetarians: detailed findings from a collaborative analysis of 5 prospective studies, American Journal of Clinical Nutrition, 70 (3): 516S.
- Rejecting meat 'keeps weight low', BBC News, March 14, 2006.
- Position of the American Dietetic Association and Dietitians of Canada: Vegetarian diets, Journal of the American Dietetic Association, American Dietetic Association and Dietitians of Canada, 2003, vol 103, issue 6, pp. 748–65. doi 10.1053/jada.2003.50142.
- Fraser G. Vegetarian diets: what do we know of their effects on common chronic diseases?Am J Clin Nutr 2009;89(suppl):1607S–12S.
- Appleby, P.; Thorogood, M.; Mann, J.; Key, T. (1998). "Low body mass index in non-meat eaters: the possible roles of animal fat, dietary fibre and alcohol". International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity 22 (5): 454–460. doi:10.1038/sj.ijo.0800607. PMID 9622343.
- Rizzo NS, Sabaté J, Jaceldo-Siegl K, Fraser GE. Vegetarian dietary patterns are associated with a lower risk of metabolic syndrome: The Adventist Health Study-2. Diabetes Care. 2011 May;34(5):1225–7
- Mattson, Mark P. Diet-Brain Connection: Impact on Memory, Mood, Aging and Disease. Kluwer Academic Publishers, 2002.
- Maggie Fox, Meat raises lung cancer risk, too, study finds, Reuters, December 10, 2007; A Prospective Study of Red and Processed Meat Intake in Relation to Cancer Risk, PLoS Medicine. April 21, 2008.
- "Vegetarian diets are associated with healthy mood states: a cross-sectional study in Seventh Day Adventist adults". June 1, 2010. Retrieved June 25, 2010.
- "Vitamin B12 Linked to Osteoporosis and Bone Loss in Vegetarians". April 29, 2011. Retrieved November 4, 2011.
- USA (Sept 216, 2008). "Bone mineral density of vegetarian and non-vegetarian adults in Taiwan". Ncbi.nlm.nih.gov. Retrieved June 1, 2013.
- Ellis FR, Holesh S, Ellis JW.. Incidence of osteoporosis in vegetarians and omnivores Am J Clin Nutr. 1972 Jun;25(6):555–8
- "Boning Up on Osteoporosis".
- "China-Cornell-Oxford Project". Cornell University. Archived from the original on 2009-02-23. Retrieved March 31, 2012.
- Brody, Jane E. (May 8, 1990). "Huge Study Of Diet Indicts Fat And Meat". The New York Times.
- Timothy J Key, Paul N Appleby, Magdalena S Rosell (2006). "Health effects of vegetarian and vegan diets". Proceedings of the Nutrition Society 65 (1): 35–41. doi:10.1079/PNS2005481. PMID 16441942.
- Davey GK, Spencer EA, Appleby PN, Allen NE, Knox KH, Key TJ (2003). "EPIC-Oxford: lifestyle characteristics and nutrient intakes in a cohort of 33 883 meat-eaters and 31 546 non meat-eaters in the UK". Public Health Nutrition 6 (3): 259–69. doi:10.1079/PHN2002430. PMID 12740075.
- Peter Emery, Tom Sanders (2002). Molecular Basis of Human Nutrition. Taylor & Francis Ltd. p. 32. ISBN 978-0-7484-0753-8.
- Brenda Davis, Vesanto Melina (2003). The New Becoming Vegetarian. Book Publishing Company. pp. 57–58. ISBN 978-1-57067-144-9.
- "Soybeans, mature seeds, raw". NutritionData.com. Retrieved August 28, 2012.
- "Seeds, chia seeds, dried". NutritionData.com. Retrieved August 28, 2012.
- "Amaranth, uncooked". NutritionData.com. Retrieved August 28, 2012.
- "Buckwheat". NutritionData.com. Retrieved August 28, 2012.
- "Pumpkin Seeds". NutritionData.com. Retrieved October 3, 2013.
- "Spirulina". NutritionData.com. Retrieved October 3, 2013.
- "Pistachio". NutritionData.com. Retrieved October 3, 2013.
- "Quinoa, cooked". NutritionData.com. Retrieved August 28, 2012.
- VR Young and PL Pellett (1994). "Plant proteins in relation to human protein and amino acid nutrition". Am. J. Clinical Nutrition 59 (5 Suppl): 1203S–1212S. PMID 8172124.
- Iron by The Vegetarian Society of the United Kingdom Limited
- The Vegetarian Resource Group
- "// Health Issues // Optimal Vegan Nutrition". Goveg.com. Retrieved August 9, 2009.
- Annika Waldmann, Jochen W. Koschizke, Claus Leitzmann, Andreas Hahn (2004). "Dietary Iron Intake and Iron Status of German Female Vegans: Results of the German Vegan Study". Ann Nutr Metab 48 (2): 103–108. doi:10.1159/000077045. PMID 14988640.
- Krajcovicova-Kudlackova M, Simoncic R, Bederova A, Grancicova E, Magalova T (1997). "Influence of vegetarian and mixed nutrition on selected haematological and biochemical parameters in children". Nahrung 41 (5): 311–14. doi:10.1002/food.19970410513. PMID 9399258.
- Craig, WJ; Mangels, AR; American Dietetic, Association (2009). "Position of the American Dietetic Association: vegetarian diets". Journal of the American Dietetic Association 109 (7): 1266–82. doi:10.1016/j.jada.2009.05.027. PMID 19562864.
- "Dietary Supplement Fact Sheet: Vitamin B12". National Institutes of Health: Office of Dietary Supplements. Retrieved November 13, 2009.
- ALGAE from STANDARD TABLES OF FOOD COMPOSITION IN JAPAN Fifth Revised and Enlarged Edition 2005
- Vegans (pure vegetarians) and vitamin B_12 deficiency
- "What Every Vegan Should Know About Vitamin B12". Vegan Society. October 31, 2001. Retrieved October 27, 2010.
- Donaldson, MS (2000). Metabolic vitamin B12 status on a mostly raw vegan diet with follow-up using tablets, nutritional yeast, or probiotic supplements 44. Ann Nutr Metab. pp. 229–234.
- Diet – Vitamins and minerals. Nhs.uk (March 14, 2011). Retrieved on May 25, 2011.
- Mozafar, A. (1997). "Is there vitamin B12 in plants or not? A plant nutritionist's view". Vegetarian Nutrition: an International Journal (1/2). pp. 50–52.
- Rosell MS, Lloyd-Wright Z, Appleby PN, Sanders TA, Allen NE, Key TJ (2003). "Long-chain n-3 polyunsaturated fatty acids in plasma in British meat-eating, vegetarian, and vegan men". Am J Clin Nutr 82 (2): 327–34. PMID 16087975.
- "Water4life: health-giving vegetarian dietary supplements". Retrieved May 17, 2008.
- Babadzhanov, A. S.; Abdusamatova, N.; Yusupova, F. M.; Faizullaeva, N.; Mezhlumyan, L. G.; Malikova, M. Kh. (2004). "Chemical Composition of Spirulina platensis Cultivated in Uzbekistan". Chemistry of Natural Compounds 40 (3): 276. doi:10.1023/B:CONC.0000039141.98247.e8.
- Tokuşoglu, Ö.; Uunal, M.K. (2003). "Biomass Nutrient Profiles of Three Microalgae: Spirulina platensis, Chlorella vulgaris, and Isochrisis galbana". Journal of Food Science 68 (4): 1144. doi:10.1111/j.1365-2621.2003.tb09615.x.
- "Calcium and Milk: Nutrition Source, Harvard School of Public Health". Web.archive.org. August 25, 2007. Archived from the original on August 25, 2007. Retrieved August 9, 2009.
- P Appleby, A Roddam, N Allen, T Key (2007). "Comparative fracture risk in vegetarians and non-vegetarians in EPIC-Oxford". European Journal of Clinical Nutrition 61 (12): 1400–6. doi:10.1038/sj.ejcn.1602659. PMID 17299475.
- "Vegan Sources of Calcium". Retrieved November 1, 2009.
- Crissey SD, Ange KD, Jacobsen KL, Slifka KA, Bowen PE, Stacewicz-Sapuntzakis M, Langman CB, Sadler W, Kahn S (2003). "Serum concentrations of lipids, vitamin D metabolites, retinol, retinyl esters, tocopherols and selected carotenoids in twelve captive wild felid species at four zoos". The Journal of nutrition 133 (1): 160–6. PMID 12514284.
- "Dietary Supplement Fact Sheet: Vitamin D". National Institutes of Health. Archived from the original on September 10, 2007. Retrieved September 10, 2007.
- "Dr. Duke's Phytochemical and Ethnobotanical Databases".
- "USDA nutrient database – use the keyword 'portabella' and then click submit".
- Bowerman, Susan (March 31, 2008). "If mushrooms see the light". Los Angeles Times. Retrieved March 25, 2010.
- USA (May 24, 2012). "Bioavailability and efficacy of vitamin D2... [J Agric Food Chem. 2011] – PubMed – NCBI". Ncbi.nlm.nih.gov. Retrieved September 12, 2012.
- Koyyalamudi, SR; Jeong, SC; Song, CH; Cho, KY; Pang, G (2009). "Vitamin D2 formation and bioavailability from Agaricus bisporus button mushrooms treated with ultraviolet irradiation". Journal of Agricultural and Food Chemistry 57 (8): 3351–5. doi:10.1021/jf803908q. PMID 19281276.
- Using Fresh Mushrooms as a Source of Vitamin D. "Using Fresh Mushrooms as a Source of Vitamin D / Nutrition / Healthy Eating". Fitday.com. Retrieved September 12, 2012.
- "Bringing Mushrooms Out of the Dark". MSNBC. April 18, 2006. Retrieved August 6, 2007.
- Timothy J Key, Gary E Fraser, Margaret Thorogood, Paul N Appleby, Valerie Beral, Gillian Reeves, Michael L Burr, Jenny Chang-Claude, Rainer Frentzel-Beyme, Jan W Kuzma, Jim Mann and Klim McPherson (September 1999). "Mortality in vegetarians and non-vegetarians: detailed findings from a collaborative analysis of 5 prospective studies". American Journal of Clinical Nutrition 70 (3): 516S–524S. PMID 10479225. Retrieved October 30, 2009.
- Key, TJ; Appleby, PN; Davey, GK; Allen, NE; Spencer, EA; Travis, RC (2003). "Mortality in British vegetarians: review and preliminary results from EPIC-Oxford". The American journal of clinical nutrition 78 (3 Suppl): 533S–538S. PMID 12936946.
- Appleby, PN; Key, TJ; Thorogood, M; Burr, ML; Mann, J (2002). "Mortality in British vegetarians". Public health nutrition 5 (1): 29–36. doi:10.1079/PHN2001248. PMID 12001975.
- Loma Linda University Adventist Health Sciences Center, New Adventist Health Study research noted in Archives of Internal Medicine, Loma Linda University, July 26, 2001. Retrieved January 9, 2010.
- Singh, PN; Sabaté J, Fraser GE (2003). "Does low meat consumption increase life expectancy in humans". Am J Clin Nutr 78 (3): 526S–532S. PMID 12936945. Retrieved 28 September 2012.
- Trichopoulou, A.; Orfanos, P; Norat, T; Bueno-De-Mesquita, B; Ocké, MC; Peeters, PH; Van Der Schouw, YT; Boeing, H; Hoffmann, K; Boffetta, P; Nagel, G; Masala, G; Krogh, V; Panico, S; Tumino, R; Vineis, P; Bamia, C; Naska, A; Benetou, V; Ferrari, P; Slimani, N; Pera, G; Martinez-Garcia, C; Navarro, C; Rodriguez-Barranco, M; Dorronsoro, M; Spencer, EA; Key, TJ; Bingham, S et al. (2005). "Modified Mediterranean diet and survival: EPIC-elderly prospective cohort study". BMJ 330 (7498): 991. doi:10.1136/bmj.38415.644155.8F. PMC 557144. PMID 15820966. Lay summary.
- "Advanced Glycation End Products and Nutrition". PHYSIOLOGY RESEARCH. Retrieved April 11, 2008.
- L M Tierney, S J McPhee, M A Papadakis (2002). Current medical Diagnosis & Treatment. International edition. New York: Lange Medical Books/McGraw-Hill. ISBN 0-07-137688-7.
- Hagen KB, Byfuglien MG, Falzon L, Olsen SU, Smedslund G (2009). "Dietary interventions for rheumatoid arthritis". In Hagen, Kåre Birger. Cochrane Database Syst Rev (1): CD006400. doi:10.1002/14651858.CD006400.pub2. PMID 19160281.
- Maya Tiwari. Ayurveda: A Life of Balance Healing Arts Press. Rochester, VT. 1995.
- Haenel H (1989). "Phylogenesis and nutrition". Nahrung 33 (9): 867–87. PMID 2697806.
- Cordain, Loren (2007). "Implications of Plio-pleistocene diets for modern humans". In Peter S. Ungar. Evolution of the human diet: the known, the unknown and the unknowable. pp. 264–5. ""Since the evolutionary split between homininis and pongids approximately 7 million years ago, the available evidence shows that all species of hominins ate an omnivorous diet composed of minimally processed, wild-plant, and animal foods."
- Milton, Katharine, "A hypothesis to explain the role of meat-eating in human evolution",Evolutionary Anthropology: Issues, News, and Reviews Volume 8, Issue 1, 1999, Pages: 11–21
- "ABC". ABC. February 25, 2003. Retrieved August 9, 2009.
- Hill, John Lawrence (1996). The case for vegetarianism. Rowman & Littlefield. p. 89. ISBN 0-8476-8138-6. Retrieved April 26, 2009.
- "Aflatoxins" (1990). Health Protection Branch Issues. Ottawa, Ontario: Health Canada, May. pp. 2–3.
- "Factory Farming". The Humane Farming Association. October 2010.
- Brown, Corrie (2000). Emerging diseases of animals. ASM Press. pp. 116–117. ISBN 1-55581-201-5. Retrieved April 26, 2009.
- Timm C. Harder and Ortrud Werner, Avian Influenza, Influenza Report 2006, 2006: Chapter two.
- Taubenberger JK, Reid AH, Lourens RM, Wang R, Jin G, Fanning TG (2005). "Characterization of the 1918 influenza virus polymerase genes". Nature 437 (7060): 889–93. doi:10.1038/nature04230. PMID 16208372.
- Antonovics J, Hood ME, Baker CH (2006). "Molecular virology: was the 1918 flu avian in origin?". Nature 440 (7088): E9; discussion E9–10. doi:10.1038/nature04824. PMID 16641950.
- Vana G, Westover KM (2008). "Origin of the 1918 Spanish influenza virus: a comparative genomic analysis". Molecular Phylogenetics and Evolution 47 (3): 1100–10. doi:10.1016/j.ympev.2008.02.003. PMID 18353690.
- Pearce-Duvet J (2006). "The origin of human pathogens: evaluating the role of agriculture and domestic animals in the evolution of human disease". Biol Rev Camb Philos Soc 81 (3): 369–82. doi:10.1017/S1464793106007020. PMID 16672105.
- Pearce-Duvet, Jessica M. C. (2006). "The origin of human pathogens: evaluating the role of agriculture and domestic animals in the evolution of human disease". Biological Reviews 81 (3): 369–82. doi:10.1017/S1464793106007020. PMID 16672105.
- Sharp PM, Bailes E, Chaudhuri RR, Rodenburg CM, Santiago MO, Hahn BH (2001). "The origins of acquired immune deficiency syndrome viruses: where and when?". Philosophical Transactions of the Royal Society B 356 (1410): 867–76. doi:10.1098/rstb.2001.0863. PMC 1088480. PMID 11405934.
- Cantor, Norman (2001). In the Wake of the Plague: The Black Death and the World It Made. Free Press. ISBN 0-684-85735-9.
- Craig, WJ; Mangels, AR; American Dietetic, Association (2009). "Position of the American Dietetic Association: vegetarian diets". J Am Diet Assoc 109 (7): 1266–1282. doi:10.1016/j.jada.2009.05.027. PMID 19562864.
- Katherine Dedyna, Healthy lifestyle, or politically correct eating disorder?, Victoria Times Colonist, CanWest MediaWorks Publications Inc., January 30, 2004. Retrieved January 10, 2010.
- O'Connor MA, Touyz SW, Dunn SM, Beumont PJ (1987). "Vegetarianism in anorexia nervosa? A review of 116 consecutive cases". Med J Aust 147 (11–12): 540–2. PMID 3696039. "In only four (6.3%) of these did meat avoidance predate the onset of their anorexia nervosa."
- David Benatar (2001). "Why the Naive Argument against Moral Vegetarianism Really is Naive". Environmental Values 10 (1): 103. doi:10.3197/096327101129340769.
- "Animals and Ethics [Internet Encyclopedia of Philosophy]". Iep.utm.edu. January 13, 2010. Retrieved September 12, 2012.
- Erik Marcus (2000). Vegan: The New Ethics of Eating. ISBN 9781590133446.
- Vegetarian Society. "Dairy Cows & Welfare".
- Vegetarian Society. "Egg Production & Welfare".
- Ovid, Metamorphoses, Book XV, translated by A.D. Melville, Oxford University Press, 1986.
- Kochhal, M. (October 2004). "Vegetarianism: jainism and vegetarianism (ahisma)".
- Teachings on Love, Thich Nhat Hanh, Berkley, Parallax Press, 1998.
- Junior encyclopaedia of Sikhism 1985 By H. S. Singha Page 124 ISBN 0-7069-2844-X / 0-7069-2844-X
- Kakshi, S.R. (2007). "12". In S.R. Bakshi, Rashmi Pathak,. Punjab Through the Ages 4 (1st ed.). New Delhi: Sarup and Sons. p. 241. ISBN 81-7625-738-9.
- "Shiromani Gurudwara Prabhandhak Committee". Sgpc.net. Retrieved August 29, 2009.
- "The Sikhism Home Page". Sikhs.org. February 15, 1980. Retrieved August 29, 2009.
- Smith, Peter (2000). "Diet". A concise encyclopedia of the Bahá'í Faith. Oxford: Oneworld Publications. pp. 121–122. ISBN 1-85168-184-1.
- Esslemont, J.E. (1980). Bahá'u'lláh and the New Era (5th ed.). Wilmette, Illinois, USA: Bahá'í Publishing Trust. ISBN 0-87743-160-4.
- `Abdu'l-Bahá (1912). MacNutt, ed. The Promulgation of Universal Peace. Wilmette, Illinois, US: Bahá'í Publishing Trust (published 1982). ISBN 0-87743-172-8.
- Research Department, Universal House of Justice. "Writings Concerning Health, Healing, and Nutrition". Retrieved May 25, 2009.
- Dharma Data: Vegetarianism. Buddhanet.net. Retrieved on May 25, 2011.
- Buddhism and Vegetarianism. Buddhanet.net. Retrieved on May 25, 2011.
- Mahavagga Pali – Bhesajjakkhandhaka – Vinaya Pitaka
- "Buddhism and Vegetarianism, The Rationale for the Buddha's Views on the Consumption of Meat" by Dr V. A. Gunasekara" 'The rule of vegetarianism was the fifth of a list of rules which Devadatta had proposed to the Buddha. Devadatta was the founder of the tapasa movement in Buddhism and his special rules involved ascetic and austere practices (forest-dwelling, wearing only rags, etc). The Buddha rejected all the proposed revisions of Devadatta, and it was in this context that he reiterated the tikoiparisuddha rule. (On this see the author's Western Buddhism and a Theravada heterodoxy, BSQ Tracts on Buddhism'
- What the Buddha Said About Eating Meat urbandharma.org. Retrieved on March 23, 2014.
- Life as a Vegetarian Tibetan Buddhist Practitioner. Serv-online.org. Retrieved on May 25, 2011.
- Apparitions of the Self: The Secret Autobiographies of a Tibetan Visionary
- The life of Shabkar: the autobiography of a Tibetan yogin, page 541
- Angulimaliya Sutra
- "Code of Canon Law". vatican.va. Retrieved July 28, 2013.
- Epiphanius, Panarion, 30.22.4
- Isidore of Seville, Etymologies, VIII.v.36
- "The Bible Christian Church". International Vegetarian Union.
- "History of Vegetarianism – Early Ideas". The Vegetarian Society. Retrieved July 8, 2008.; Gregory, James (2007) Of Victorians and Vegetarians. London: I. B. Tauris pp. 30–35.
- "William Cowherd (brief information)". Oxford Dictionary of National Biography. Retrieved July 8, 2008.
- "Position Statement on Vegetarian Diet". Sdada.org. Retrieved September 12, 2012.
- "The Seventh-day Adventist Health Message". Sdada.org. Retrieved November 28, 2012.
- "Living an Orthodox Life: Fasting". Orthodoxinfo.com. May 27, 1997. Retrieved February 3, 2010.
- "The Great War and the Interwar Period". ivu.org. Retrieved August 14, 2009.
- Tähtinen, Unto: Ahimsa. Non-Violence in Indian Tradition, London 1976, p. 107–109.
- "The Hindu : Sci Tech / Speaking Of Science : Changes in the Indian menu over the ages". Hinduonnet.com. October 21, 2004. Retrieved February 3, 2010.
- Muslims can’t be vegetarian? Retrieved May 16, 2008
- Vegetarian quotations from Bawa Muhaiyaddeen Retrieved May 16, 2008
- Wings of Fire, A.P.J. Abdul Kalam biography. Retrieved December 28, 2010.
- "IVU News – Islam and Vegetarianism". Ivu.org. Retrieved August 9, 2009.
- "Vegetarianism Good For The Self And Good For The Environment" at The Jain Study Circle
- "Spiritual Traditions and Vegetarianism"[dead link] at the Vegetarian Society of Colorado website.
- Matthews, Warren: World Religions, 4th edition, Belmont: Thomson/Wadsworth 2005, p. 180. ISBN 0-534-52762-0
- "Jainism" at JainUniversity.org
- Kook, Avraham Yitzhak (1961). Cohen, David, ed. A Vision of Vegetarianism and Peace.
- "Judaism & Vegetarianism". Jewishveg.com. Retrieved August 9, 2009.
- Jewish philosophy of vegetarianism article by Philip L. Pick
- "The Vision of Eden: Animal Welfare and Vegetarianism" in "Jewish Law and Mysticism", Orot 2003
- Osborne, L (1980), The Rasta Cookbook, 3rd ed. Mac Donald, London.
- Kebede, A., & Knotternus, D. (1998). "Beyond the pales of babylon: the ideational components and social psychological foundations of rastafari". Sociological Perspectives 41 (3): 499–517. doi:10.2307/1389561.
- "Misconceptions About Eating Meat", Sikhism Home Page
- I.J. Singh, Sikhs and Sikhism, Manohar, Delhi ISBN 978-81-7304-058-0: "Throughout Sikh history, there have been movements or subsects of Sikhism which have espoused vegetarianism. I think there is no basis for such dogma or practice in Sikhism."
- Surindar Singh Kohli, Guru Granth Sahib, An Analytical Study, Singh Bros. Amritsar ISBN 81-7205-060-7: "The ideas of devotion and service in Vaishnavism have been accepted by Adi Granth, but the insistence of Vaishnavas on vegetarian diet has been rejected."
- Gopal Singh, History of the Sikh People, World Sikh Univ. Press, Delhi, ISBN 978-81-7023-139-4: "Nowadays in the Community Kitchen attached to the Sikh temples, and called the Guru's Kitchen (or Guru-ka-langar), meat dishes are not served at all. Maybe it is on account of its being, perhaps, expensive or not easy to keep for long. Or perhaps the Vaishnava tradition is too strong to be shaken off."
- Randip Singh, Fools Who Wrangle Over Flesh, Sikh Philosophy Network, December 7, 2006. Retrieved January 15, 2010.
- "Sikh Reht Maryada, The Definition of Sikh, Sikh Conduct & Conventions, Sikh Religion Living, India". sgpc.net. Retrieved August 29, 2009.
- Jane Srivastava, "Vegetarianism and Meat-Eating in 8 Religions", Hinduism Today, Spring 2007. Retrieved January 9, 2010.
- Gyani Sher Singh, Philosophy of Sikhism, Shiromani Gurdwara Parbandhak Committee, Amritsar: "As a true Vaisnavite, Kabir remained a strict vegetarian. Kabir, far from defying Brahmanical tradition as to the eating of meat, would not permit so much as the plucking of a flower (G.G.S. p. 479), whereas Nanak deemed all such scruples to be superstitions."
- Harjinder Singh, "Guru ka Langar". Retrieved December 28, 2010.
- "Sikhism Home Page". Sikhs.org. Retrieved August 9, 2009.
- Singh, Prithi Pal (2006). "3 Guru Amar Das". The History of Sikh Gurus. New Delhi: Lotus Press. p. 38. ISBN 81-8382-075-1.
- "Livestock's Long Shadow – Environmental issues and options". Fao.org. Retrieved August 9, 2009.
- EPA. 2011. Inventory of U.S. greenhouse gas emissions and sinks: 1990–2009. United States Environmental Protection Agency. EPA 430-R-11-005. 459 pp.
- Olsson, Anna (2008-07-08). "Comment: Lab-grown meat could ease food shortage". New Scientist. Retrieved November 17, 2008.
- Could vegetarians eat a 'test tube' burger?
- Why eating less meat could cut global warming Guardian
- "Belgian city plans 'veggie' days", Chris Mason, BBC, May 12, 2009
- "Killing for a Living: How the Meat Industry Exploits Workers". Retrieved July 16, 2009.
- "Worker Health and Safety in the Meat and Poultry Industry". Hrw.org. Retrieved August 9, 2009.
- "Food Safety, the Slaughterhouse, and Rights". Ncrlc.com. March 30, 2004. Archived from the original on December 23, 2007. Retrieved August 9, 2009.
- Positive Safety Culture. The key to a safer meat industry, A literature review July 2000, safework.sa.gov.au
- Working conditions in agriculture International Labour Organization
- Working conditions in agriculture Berne Declaration
- World Development Report 2008: Agriculture for Development, Published by World Bank Publications p. 207
- Worldwatch Institute, News July 2, 1998, United States Leads World Meat Stampede
- Children with a high IQ are more likely to become vegetarian :: University of Southampton. Soton.ac.uk (December 15, 2006). Retrieved on May 25, 2011.
- Dec 15, 2006. "High IQ link to being vegetarian". BBC News. Retrieved September 12, 2013.
- Hodson, Gordon (September 1, 2012). "Prejudice Against "Group X" (Asexuals)". Psychology Today. Retrieved December 30, 2013.
- "The gender gap: if you're a vegetarian, odds are you're a woman. Why?". Vegetarian Times. February 1, 2005. Retrieved October 27, 2007.
- "'More girl babies' for vegetarians". BBC News. August 7, 2000. Retrieved August 9, 2009.
|Find more about Vegetarianism at Wikipedia's sister projects|
|Definitions and translations from Wiktionary|
|Media from Commons|
|Quotations from Wikiquote|
|Travel guide from Wikivoyage|
- Vegetarian and Vegan Information
- Resources/Support for Vegetarians
- International Congress on Vegetarian Nutrition
- Shattering The Meat Myth: Humans Are Natural Vegetarians by Kathy Freston, The Huffington Post, June 11, 2009
- Famous Vegetarians – slideshow by Life magazine
- Side Effects of Becoming a Vegetarian, National Geographic
- MedlinePlus Encyclopedia