Science Fair Project Encyclopedia
- For animals adapted to eat primarily plants, sometimes referred to as vegetarian animals, see Herbivore. "Vegetarianism" refers to the choice of a usually omnivorous animal to consume a non-meat-based diet.
Vegetarianism is a dietary practice characterised by the consumption of only vegetables, fruit, nuts, grains and pulses, and excluding the consumption of all body parts of any animal and products derived from animal carcasses (such as lard, tallow, gelatin, cochineal), from one's diet. The most common definition of vegetarianism however accepts the inclusion of animal-based products such as honey, milk and other dairy products as well as eggs. This is more precisely called ovo-lacto vegetarianism.
Varieties of vegetarianism (terminology)
Different practices of vegetarianism include:
- Vegetarians who avoid consuming all animal products (such as eggs, milk, cheese, and honey)are commonly called vegans, though some reserve this term for those who additionally avoid usage of all kinds of animal products (such as leather and some cosmetics), rather than just food.
- Ovo-lacto vegetarians do not eat meat, but may consume animal products such as eggs and milk. Those who are ovo-lacto vegetarians for ethical reasons may additionally refuse to eat cheese made with animal-based enzymes (rennet), or eggs produced by factory farms. The term "vegetarian" is most commonly intended to mean "ovo-lacto vegetarian", particularly as "vegan" has gained acceptance as the term for stricter practice.
- Lacto vegetarians do not eat meat, but may consume milk and its derivatives, like cheese, butter, or yogurt.
- Similarly, ovo-vegetarians do not eat meat but may eat eggs.
- Macrobiotics involves a diet consisting mostly of whole grains and beans, and is usually spiritually based like Fructarianism (see below).
- Raw Foodism involves food, usually vegan, which is not heated above 116°F (46.7°C); it may be warmed slightly or raw, but never cooked. Raw Foodists argue that cooking destroys enzymes, and/or portions of each nutrient; this is true, but most raw foodists also acknowledge that for some foods, as cooking softens them, their nutrients become more bio-available, which more than negates the destruction of some nutrients and enzymes. Some raw-foodists, called living-foodists, also "activate" the enzymes (such as by soaking the food in water) a while before they plan to eat the food. Some spiritual raw-foodists are also Fructarians and some eat only organic foods (see below).
Religious dietary restrictions come in many forms and are sometimes compatible with the secular terminology; see below.
The following are not generally considered vegetarianism:
- Fructarians, more commonly called "fruitarians", eat only fruit, nuts, seeds, and other plant matter that can be gathered without harming the plant (some fructarians eat only plant matter that has already fallen off the plant). This typically arises out of a holistic philosophy. Thus, a fructarian will eat beans, tomatoes, cucumbers, pumpkins, and the like, but will refuse to eat potatoes or spinach. Technically, fructarianism is a kind of vegetarianism, but its much stricter definition is very rarely seen as being the same thing as vegetarianism. It is also hotly disputed whether it is possible to avoid malnutrition with a fructarian diet. Fructarianism is much rarer than vegetarianism or veganism.
- Some people choose to avoid certain types of meat for many of the same reasons that others choose vegetarianism: health, ethical beliefs, etc. For example, some people will not eat "red meat" (mammal meat – beef, lamb, pork, etc.) while still consuming poultry and seafood. This is not traditional vegetarianism, but has recently been referred to in the media as semi-vegetarianism (see pesco/pollo vegetarianism for other terms). Some non-vegetarians thus assume vegetarianism to be pesco/pollo vegetarianism.
- Others might regard the suffering of animals in factory farm conditions as their sole reason for avoiding meat or meat based foods. These people will eat meat or meat products from animals raised under more humane conditions or hunted in the wild. Some of these people would refer to themselves as vegetarians.
- Freegans subscribe to a purely environmental mentality: although meat is generally avoided, eating meat that has been discarded by others is acceptable. The environmental impact of this practice is seen as null or perhaps even beneficial (although discarded meat can be safely composted in some facilities). Freegans often prefer discarded food in any case, even if it is not meat. But producing meat is believed to have more environmental impact than other foods, so this is often the focus of freeganism.
- Flexitarians adhere to a diet that is mostly vegetarian. However, they occasionally consume meat.
In current English, the term "vegetarian" is occasionally used for restricted diets that nevertheless include some types of meat. Usually these deviations from traditional usage are made casually, perhaps for lack of a better word. The resulting confusion of terms can create awkward situations for more strict vegetarians, however, as any traditional vegetarian who has been expected to eat a dish because it "only contains a little meat" (or "is just fish") can readily attest.
In 1847, attendees at the meeting of the first Vegetarian Society in Ramsgate, England, agreed that a "vegetarian" was a person who refuses to consume flesh of any kind. Prior to that time, vegetarians had often been called Pythagoreans, after the philosopher and his followers who also abstained from meat (and possibly some types of beans).
- In the United States, vegetarianism is usually synonymous with ovo-lacto vegetarianism. However, vegetarians are sometimes wrongly assumed to be pesco/pollo vegetarians who will tolerate some meat. It is also possible to order a vegetarian meal and be served meat.
- In the UK, due to its sizeable Hindu minority, vegetarianism often refers to the Hindu practice described further below. Voluntary labelling of vegetarian foods is widespread, but far from universal. Many manufacturers will label food as "suitable for vegetarians" though there is currently no agreed definition of this. In addition, the Vegetarian Society operates a scheme where foods that meet its strict criteria can be labelled as "Vegetarian Society-approved". Cheese is often labelled as well, making it possible to identify cheeses that have been made with non-animal rennet. Flavourings in ingredients lists to not need to specify if they come from animal origin, which can make identifying vegetarian foods difficult if they are not otherwise labelled as such.
- In Ireland, food labelling is in place.
- In Germany, the confusion of vegetarianism with pesco/pollo vegetarianism is also common. There is no food labelling in place, and buying only vegetarian foods can involve having to read the fine printed ingredients list ("Zutaten") on many food products.
- In Australia the same conditions apply as in Germany. Some manufacturers who target the vegetarian market will label their foods, however except for foods intended for export to the United Kingdom, this labelling can be inconsistent. Flavourings in ingredients lists do not need to specify if they come from animal origin. As such, natural flavour could be derived from either plant or animal sources.
Vegetarian societies (apart from India) were first formed in majority meat eating European countries both as a means to promote the diet and to gather together vegetarians for mutual support. By 2000, most western and developing nations had functioning vegetarian societies. The countries that were first to establish societies are still the ones most likely to have the greatest proportion of vegetarians within their populations.
The first societies were:
- 1847 - United Kingdom
- 1850 - United States of America
- 1867 - Germany
- 1880 - France
- 1886 - Australia
- 1889 - India
- 1890 - Ireland
- 1893 - Switzerland
- 1894 - Netherlands
- 1895 - Sweden
- 1896 - Denmark
- 1896 - Hungary
- 1899 - Belgium
- 1900 - Austria
The International Vegetarian Union , a union of all the national societies, was founded in 1908.
A majority of the world's vegetarians follow the practice for religious reasons. Many religions, including Buddhism, Hinduism, Taoism, and especially Jainism, teach that ideally life should always be valued and not willfully destroyed for unnecessary human gratification.
Jews, Christians, and Muslims are all left with the biblical ideal of the "Garden of Eden" diet, which from all appearances is strictly vegan (see Genesis 1:29, 9:2-4; Isaiah 11:6-9). However, only minorities within these populations actually practice and advocate such strict diets, since the same book of the Bible, Genesis, later gives permission to Noah's descendants to consume animal flesh, but not without great suffering simultaneously administered to all creatures: "The fear and dread of you will fall upon all the beasts of the earth and all the birds of the air, upon every creature that moves along the ground, and upon all the fish of the sea" (Gen. 9:2). Suffice to say, the Judeo-Christian God's permission for humankind to eat meat was not an unmixed or otherwise "unqualified" blessing. It was a concession, with penalties — not the least of which was, most probably, a dramatically decreased life expectancy (see Gen. 6:3). (Noah's great-grandfather, Methuselah, is famously reported as having lived an amazing 969 years, prior to the dawn of God-authorized human meat-eating.)
In the Bible, the Book of Genesis teaches that human beings were originally vegetarian, but that later, following the Deluge, God permitted people to eat meat as well. Many Judeo-Christian vegetarians interpret this to mean that God originally intended human beings to be vegetarians, and that people would do well to be vegetarians, even though meat-eating is permitted. Additionally, some Biblical prophecy suggests that in the Messianic age , there will be universal vegetarianism, even among normally carnivorous animals (for example, Isaiah 11:7 says, "The cow will feed with the bear, their young will lie down together, and the lion will eat straw like the ox.").
Rabbinical Judaism discourages ascetic practices in general. With respect to food, this teaching may be summarized by the Talmudic statement, "Man will have to account for everything he saw but did not eat." To Jewish vegetarians wishing to remain consistent with this teaching, vegetarianism is not a form of self-deprivation, because the vegetarian does not desire to eat meat and believes it is healthier not to eat meat. On the other hand, the Talmud discourages indulgence and states that it is preferable that one's diet consist mostly of non-meat products. There are several arguments from Judaism used by Jewish vegetarians. One is that, since Adam and Eve were not allowed to eat meat and that, according to some opinions, in the Messianic era, the whole world will be vegetarian, not eating meat is something that brings the world closer to that ideal. A second one is that the laws of shechita are meant to prevent the suffering of animals and today, with factory farming, even kosher slaughterhouses are considered by some authorities not to fulfill enough of the requirements to render the meat kosher. A third one is that the Sages only mandated eating an olive's bulk of meat during festivals, but even then, this was because in Talmudic times, meat was considered essential for one's diet (whereas a vegetarian will probably be of the opinion that current science has shown otherwise).
In Christianity, Paul wrote in his Epistle to the Romans that although he himself ate meat, the choice to eat meat or abstain from meat should be a matter of personal conviction: "The man who eats everything must not look down on him who does not, and the man who does not eat everything must not condemn the man who does, for God has accepted him." (Romans 14:3). Several Christian monastic groups have encouraged vegetarianism, including the Desert Fathers, Trappists, Benedictines, and Carthusians. Some Protestant groups, such as Seventh-day Adventists, take a literal interpretation of the Biblical prophecies of universal vegetarianism and encourage vegetarianism as a preferred, though not required, lifestyle. However, most evangelical groups are unaware of the existence of any such prophecies, and point instead to the explicit prophecies of temple sacrifices in the Messianic Kingdom, many of which are eaten—see Ezekiel 46:12 where peace offerings and freewill offerings will be offered, and Leviticus 7:15-20 where it states that such offerings are eaten. In the nineteenth century, members of the Bible Christian sect established the first vegetarian groups in England and the United States.
Islam explicitly permits the eating of some kinds of meat. The Hadith collection of al-Nasa'i recounts an episode wherein several of Muhammad's companions wish to practice various ascetic practices including sexual abstinence, vegetarianism, and extreme fasting, and Muhammad rebukes them all. Since in Islam, it is forbidden to forbid that which is permitted, some Islamic scholars conclude that vegetarianism is forbidden. Muslim vegetarians and their supporters, however, make a distinction between choosing not to do something and forbidding it, and argue that a Muslim may choose to be a vegetarian, but as an aesthetic or ethical consideration and not as a religious duty. However, Muslims see little difference between religious duty and ethical duty and therefore, this view is not widely accepted.
Rastafarians generally follow a diet called "I-tal", which eschews the eating of food that has been artificially preserved, flavoured, or chemically altered in any way. Many Rastafarians consider it to also forbid the eating of meat.
Hindus of certain castes, especially Brahmins, are forbidden from consuming anything gained at the expense of an animal's suffering, such as meat, eggs, animal byproducts such as rennet and gelatin (including gelatin capsules), and honey. The milk of cows, buffalo, and goats as well as dairy products (other than cheese containing rennet) are acceptable, as milk is given willingly. Leather from cows who have died of natural causes is acceptable (Note: The diet of the orthodox Hindu also excludes alcohol, as well as "overly-stimulating" foods such as onions and garlic). However, not all Hindus are vegetarian.
- All dietary rules listed for Hindus apply to Jains, in addition to which Jains must take into account any suffering caused to plants and suksma jiva (Sanskrit: subtle life forms; refers to what would later be termed "microorganisms") by their dietary choices. They are forbidden from eating most root vegetables (such as potatoes) and deem many other vegetables acceptable only when harvested during certain times of the year.
In Chinese societies, "simple eating" (素食 su4shi2) refers to a particular restricted diet associated with Taoist monks, and sometimes practiced by members of the general population during Taoist festivals. It is referred to by the English word "vegetarian"; however, though it rejects meat, eggs and milk, this diet does include oysters and oyster products.
Many Westerners think that Buddhist precept against killing implies that Buddhist should avoid eating the meat of animals. However, this is to miss the distinction between killing of animal and eating of already dead meat. And during the Buddha's time, there was no general rule requiring monks to refrain from eating meat. In Pali scriptures there are several recorded instance of Buddha eating meat, though whether Buddha died from eating tainted pork is disputed. In fact, at one point the Buddha specifically refused to make such a rule, declaring that one can eat meat as long as one does not hear, see or suspect that meat is specifically killed for oneself. And these rules were invoked in relation to commercial purchase of meat in an episode involving General Shia. Buddha also stated that it is one's immoral intents that makes one impure, not the eating of meat, and declared meat eating as karmically neutral.
However the situation is very different in the case of Mahayana Buddhism. Though Mahayana Buddhism accepts Theravadan sutras as valid, in their own Mahayana sutras, the account of Buddha eating meat is absent. Secondly, at the time when Mahayana Buddhists were formulating their monastical rules, monks and nuns no longer received their food by begging. Instead, they lived in a monastery, where food was sent to them from outside by the lay community. So, if meat was offered, it was specifically killed and prepared for monks, which violates Buddha's rule. Thirdly, Mahayana Buddhism places great emphasis on the Boddhisattva way, where the cultivation of compassion is the central focus of the practice. In Mahaparinirvana, it is stated that "the eating of meat extinguishes the seed of great compassion". In addition, a passage in the Lankavatara Sutra shows the Buddha inveighing strongly in favor of vegetarianism, though the historical accuracy of this passage is strongly disputed. Therefore, meat eating came to be greatly discouraged in early Mahayana schools. This is still the case in Chinese Buddhism, while many Japanese and Korean schools has adopted different interpretations of this issue. In Vajrayana Buddhism, tantric practice is said to purify one regardless of one's diet.
A belief that continues in Theravada Buddhism from its Vedic roots is that the killing of larger animals results in more bad karma than that of smaller ones, so it would be less bad to kill a chicken than a cow. This is due to the greater intention and effort required to kill the larger animal. Furthermore, fish are considered of lesser importance than mammals.
In the modern Buddhist world, attitudes toward vegetarianism vary by location. In China and Vietnam, monks typically eat no meat (and with other restrictions as well – see Buddhist cuisine). In Japan or Korea some schools do not eat meat, while most do. Theravadans in Sri Lanka and Southeast Asia do not practice vegetarianism. All Buddhists however, including monks, are allowed to practice vegetarianism if they wish to do so.
In the Bahá'í Faith a vegetarian diet, although not required, is often considered preferable. Furthermore, Bahá'ís believe "Fruits and grains" will be the foods of the future and the time will come when meat will no longer be eaten .
Many people believe that the production of meat and animal products at current and likely future levels is environmentally un-sustainable. It is also argued that even if sustainable, modern industrial agriculture is changing ecosystems faster than they can adapt. While vegetarian agriculture produces some of the same problems as animal production, the environmental impact of animal production is significantly greater. 
Water is becoming an increasingly scarce resource in many parts of the world. Overuse by humans is damaging to rivers and ecosystems and leads to salinity and desertification. A vegetarian diet uses considerably less water than a meat based diet. This is because to produce meat water must be used in the production of feed for animals, which much be fed to the animals during their entire life. The loss of water (and energy) between trophic levels is very large. When the grains go directly to humans this inefficiency is avoided. As an illustration, the water needed to produce a pound of wheat in the USA is 14 gallons whereas the water needed to produce a pound of beef is 441 gallons. More than half of the water use for all purposes in the USA is used for livestock production. L. Beckett & J. W. Oltjen. (1993). Estimation of the water requirement for beef production in the United States. Journal of Animal Science, 71, 818-8268.
Animal protein demands greater expenditures of fossil fuel energy — eight times as much for a comparable amount of plant protein. Corliss, R. (2002, July). Should We All Be Vegetarians? Time. This is wasteful of non-renewable fossil fuels and produces carbon dioxide, a greenhouse gas. Animal production also creates damaging animal waste. In the United States (the world's largest emitter of greenhouse gases) livestock account for nearly 20% of total methane emissions.  One ton of methane has the global warming potential of 23 tons of carbon dioxide.
Factory farm animal production, while having a smaller land-use footprint, requires large quantities of feed that must be grown over large areas of land. Free-range animal production requires land for grazing, which has prompted encroachment on undeveloped lands and clear cutting. The move into wild lands has increased the rate of species extinction and damaged the services offered by nature, such as natural processing of pollutants. Over-grazed lands lose their ability to support animal production, which makes further agricultural expansion necessary. According to the United Nations, ranching-induced deforestation is one of the main reasons for the loss of plant and animal species in tropical rainforests. F.A.O., United Nations. (1996). Livestock & the Environment. Overfishing and trawling are also very destructive to sea ecosystems.
Compare this with economic vegetarians, who consider the meat industry economically unsound.
“The cost of mass-producing cattle, poultry, pigs and sheep and fish to feed our growing population... include highly inefficient use of freshwater and land, heavy pollution from livestock feces... and spreading destruction of the forests on which much of our planet's life depends.” - Time magazine 11/8/99
"Rain forests are still being felled to graze hamburger cattle. Going vegan saves one acre [4,000 m²] of forest every year." - Cornell University
"On irrigated land, 1 lb of vegetables uses 25 gallons (200 L/kg). 1 lb of beef uses 5,214 gallons (44,000 L/kg)." - University Of California
"The world's 17 major fisheries are on the point of environmental collapse because of over-fishing" - United Nations
"If Britain went vegetarian, less than half the farm land would be needed - vegan, less than a quarter" - University of Reading
Citing the same efficiency concerns as environmentalist vegetarians and economic vegetarians, many vegetarians see natural resources as being freed up by vegetarianism, particularly veganism.
A popular saying is that even with more food, the problem is shipping all of that food to the starving people. Yet, petroleum is one of the resources freed up for other usage by a vegan diet: Within the Pulitzer-winning book by John Robbins, "Diet for a New America," which uses data primarily sourced from the world's largest body of scientists, AAAS, Robbins explains how the petroleum used in the transportation of farm-animals, the later processing of them, and the raising and harvesting of the vast amount of crops fed to farm-animals (which is much greater than the amount of crops people would need if we were to eat the crops directly, rather than feeding them to animals, then eating the animals), adds up to greatly increase the amount of petroleum used. So, if more people adopt a vegan diet, not only is more food available, but more petroleum to deliver that food is. Critics of this view may observe that the root causes of world hunger are often traceable to harmful political structures rather than genuine resource shortages; see Hunger.
"35 per cent of the world's people can be fed on a meat-based diet. A plant diet could feed everyone – then plus some." - Sir Crispin Tickell
"It takes about 10 kg of good quality plant protein - such as wheat and soy - to produce 1 kg of meat protein."
"The amount of veg protein fed to the US beef herd would feed almost the entire populations of India and China - two billion people."
"Veg consumption is much more efficient than growing feed for meat production and dairying." - WHO
"Amount of grain needed to end extreme hunger - 40 million tonnes. Amount of grain fed to animals in the West - 540 million tonnes." - United Nations
Ethics and animal rights
Some vegetarians believe that the production and consumption of meat and animal products are inappropriate treatments of animals. Reasons for believing this are varied, and may include a belief in animal rights or an aversion to inflicting harm on other living things. Many believe that the treatment which animals undergo in the production of meat and animal products obliges them to never eat meat or use animal products, even if this is a considerable inconvenience.
The spread of factory farming has led to animals being treated as commodities, resulting in an enormous amount of suffering in the pursuit of profit, has caused many people to become vegetarian. Most agree that a mass demand for meat can never be satisfied without a mass-production system disregards towards the welfare of animals. 
Philosophers Peter Singer and Michael Berumen believe that if alternative means of survival exist, one ought to choose the option that does not cause unnecessary harm to animals. With the exception of a small minority of people, such as nomadic hunting and herding societies everyone is free to choose not to eat meat or use animal products without sacrificing their health (see Health_and_weight-loss). Most 'ethical' vegetarians observe that the same reasons exist against killing sentient animals to eat as against killing humans to eat. They have said that killing an animal for food is wrong because the animal does not want to die and is given no choice, the family and friends of that animals will suffer as a result, the animal has hopes for future enjoyment which are denied, the animal enjoys living and the animal experiences varying levels fear and pain in the process of being killed.
John Webster, professor of animal husbandry at Bristol has said: “People have assumed that intelligence is linked to the ability to suffer and that because animals have smaller brains they suffer less than humans. That is a pathetic piece of logic, sentient animals have the capacity to experience pleasure and are motivated to seek it, you only have to watch how cows and lambs both seek and enjoy pleasure when they lie with their heads raised to the sun on a perfect English summer’s day. Just like humans.” 
Aesthetic and emotional
Health and weight-loss
According to reputable sources such as the American Dietetic Association, American Heart Association, British Medical Association, and the Mayo Clinic, vegetarian diets offer a number of health benefits compared to non-vegetarian diets. Vegetarians as a group compared to non-vegetarians have lower body mass indices, lower levels of cholesterol, lower blood pressure, and less incidence of heart disease, hypertension, type 2 diabetes, some forms of cancer, renal disease, dementia, and osteoporosis  .
As for weight loss, in a year-long study comparing Dean Ornish's vegetarian diet to Weight Watchers, The Zone Diet , and The Atkins Diet, Dean Ornish's diet showed the most weight-loss. (source: Dansinger, M.L., Gleason, J. L., Griffith, J.L., et al., "One Year Effectiveness of the Atkins, Ornish, Weight Watchers, and Zone Diets in Decreasing Body Weight and Heart Disease Risk", Presented at the American Heart Association Scientific Sessions November 12, 2003 in Orlando, Florida.)
"Vegetarians have lower rates of obesity, coronary heart disease, high blood pressure, large bowel disorders, cancers and gallstones." - British_Medical_Association
"Vegetarians often live longer and suffer less from several chronic diseases." - ADA
"Diabetes is much less likely to be a cause of death in vegetarians" - ADA
"95 per cent of all food poisoning comes from meat and animal products" - British Medical Association
For more health information, including peer-reviewed citations regarding specific nutrients, see the separate entry for vegetarian nutrition.
Some vegetarians are vegetarian because they were raised by vegetarians. Others may have become vegetarians because of a vegetarian partner, family member, or friend. Some people live in regions that are predominantly vegetarian (such as Gujarat), making meat-eaters a minority. When removed from the social influences that cause vegetarianism, some people will stop being vegetarian while others will remain vegetarian.
Social aspects also influence some vegetarians who believe slaughterhouses have a negative psychological and socializing effect on the employees charged with slaughtering the animals.
While vegetarianism is commonly defined strictly on the basis of dietary intake, many religiously, ethically or environmentally motivated vegetarians, in common with the animal rights and Green movements, try to minimise the harm done to animals in all aspects of their lives.
Many religiously motivated vegetarians consider the avoidance of skin contact with products made from body parts (such as leather, tallow, soap) an integral part of their definition of vegetarianism. Others consider leather made from the skin of animals who died of natural causes acceptable. While for many Hindus it is impractical, there are those who shy away completely from the use of leather articles made from cowhide. Some state and cities in India have even banned cow-slaughter in places of pilgrimage or whole regions based on the sentiments of some Hindus.
- Vegetarian cuisine
- Vegetarian nutrition
- List of notable vegetarians
- People for the Ethical Treatment of Animals
- Animal Liberation Front, Animal Liberation Front Supporters Group
- List of diets
- Macrobiotic diet
- Virtual water
- Imitation meat
- In vitro meat
- Animal rights, Animal testing, Vivisection
- Economic vegetarian
- Barry Horne, Henry Spira
- Peter Singer
Resources for vegetarians
- ChooseVegetarian.com (info on factory farming, vegetarian nutrition, and recipes)
- HappyCow's Vegetarian Guide (Searchable, worldwide directory to vegetarian restaurants and natural health food stores)
- VeggieBoards (message board and recipes)
- vegsource (news, magazine, message boards and recipes)]
- Peta2 ( Question Reality Question Authority )
- Vegan Outreach- Critical scientific information for the vegetarian community
-  How Meat-centred Eating Patterns Affect Food Security and the Environment
- Second Opinions (critique of vegetarian diets)
- Meat Filter, a vegetarian and vegan blog
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