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egetarianism /vɛdʒɪˈtɛəriənɪzəm/ is the practice of abstaining from the consumption of meat (red meat, poultry, seafood, and the fleshof any other animal), and may also include abstention from by-products of animal slaughter.^[1][2][3][4]

Vegetarianism may be adopted for various reasons. Many people object to eating meat out of respect for sentient life. Such ethical motivations have been codified under various religious beliefs, as well as animal rights advocacy. Other motivations for vegetarianism are health-related, political, environmental, cultural, aesthetic, economic, or personal preference. There are variations of the diet as well: an ovo-lacto vegetarian diet includes both eggs and dairy products, an ovo-vegetarian diet includes eggs but not dairy products, and a lacto-vegetarian diet includes dairy products but not eggs. A vegan diet excludes all animal products, including eggs and dairy. Some vegans also avoid other animal products such as beeswax, leather or silk clothing, and goose-fat shoe polish.

Packaged and processed foods, such as cakes, cookies, candies, chocolate, yogurt, and marshmallows, often contain unfamiliar animal ingredients, so may be a special concern for vegetarians due to the likelihood of such additions.^[3][5] Often, prior to purchase or consumption, vegetarians will scrutinize products for animal-derived ingredients.^[5] Vegetarians' feelings vary with regard to these ingredients. For example, while some vegetarians may be unaware of animal-derived rennet's role in the production of cheese, and may therefore unknowingly consume the product,^[3][6][7] other vegetarians may not take issue with its consumption.^[3][4]

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.^[8][9] Apescetarian diet has been described as "fish but no other meat".^[10] The common-use association between such diets and vegetarianism has led vegetarian groups such as theVegetarian Society to state that diets containing these ingredients are not vegetarian, because fish and birds are also animals.^[11]

Source:Vegetarianism Wikipedia