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Veganism is the practice of abstaining from the use of animal products—particularly in diet—and an associated philosophy that rejects the commodity status of animals. A person who follows the diet or philosophy is known as a vegan.

Distinctions may be made between several categories of veganism. Dietary vegans, also known as "strict vegetarians", refrain from consuming meat, eggs, dairy products, and any other animal-derived substances. An ethical vegan is someone who not only excludes animal products from their diet but also tries to avoid using animals, animal products, and animal-tested products when practical. Another term is "environmental veganism", which refers to the avoidance of animal products on the grounds that the industrial farming of animals is environmentally damaging and unsustainable. Another motivation for veganism is concern about animal welfare.

Vegan diets tend to be higher in dietary fiber, magnesium, folic acid, vitamin C, vitamin E, iron, and phytochemicals, and lower in dietary energy, saturated fat, cholesterol, omega-3 fatty acid, vitamin D, calcium, zinc, and vitamin B₁₂. As a result of the elimination of all animal products, a poorly planned vegan diet can lead to nutritional deficiencies that counteract its beneficial effects and cause serious health issues, some of which can only be prevented with fortified foods or dietary supplements. Vitamin B₁₂ supplementation is important because its deficiency can cause blood disorders and potentially irreversible neurological damage; this danger is also one of the most common in poorly planned non-vegan diets.

The word vegan was coined by Donald Watson and his later wife Dorothy Morgan in 1944. Interest in veganism increased significantly in the 2010s.

Vegetarianism can be traced back to the Indus Valley civilization in 3300–1300 BCE in the Indian subcontinent, particularly in northern and western ancient India. Early vegetarians included Indian philosophers such as Parshavnatha, Mahavira, Acharya Kundakunda, Umaswati, Samantabhadra, and Valluvar; the Indian emperors Chandragupta Maurya and Ashoka; Greek philosophers such as Empedocles, Theophrastus, Plutarch, Plotinus, and Porphyry; and the Roman poet Ovid and the playwright Seneca the Younger. The Greek sage Pythagoras may have advocated an early form of strict vegetarianism, but his life is so obscure that it is disputed whether he ever advocated any form of vegetarianism. He almost certainly prohibited his followers from eating beans and wearing woolen garments. Eudoxus of Cnidus, a student of Archytas and Plato, writes, "Pythagoras was distinguished by such purity and so avoided killing and killers that he not only abstained from animal foods, but even kept his distance from cooks and hunters". One of the earliest known vegans was the Arab poet al-Maʿarri, famous for his poem "I No Longer Steal From Nature". (c. 973 – c. 1057). Their arguments were based on health, the transmigration of souls, animal welfare, and the view—espoused by Porphyry in De Abstinentia ab Esu Animalium ("On Abstinence from Animal Food", c. 268 – c. 270)—that if humans deserve justice, then so do animals.

Vegetarianism established itself as a significant movement in 19th-century Britain and the United States. A minority of vegetarians avoided animal food entirely. In 1813, the poet Percy Bysshe Shelley published A Vindication of Natural Diet, advocating "abstinence from animal food and spirituous liquors", and in 1815, William Lambe, a London physician, said that his "water and vegetable diet" could cure anything from tuberculosis to acne. Lambe called animal food a "habitual irritation" and argued that "milk eating and flesh-eating are but branches of a common system and they must stand or fall together". Sylvester Graham's meatless Graham diet—mostly fruit, vegetables, water, and bread made at home with stoneground flour—became popular as a health remedy in the 1830s in the United States. Several vegan communities were established around this time. In Massachusetts, Amos Bronson Alcott, father of the novelist Louisa May Alcott, opened the Temple School in 1834 and Fruitlands in 1844, and in England, James Pierrepont Greaves founded the Concordium, a vegan community at Alcott House on Ham Common, in 1838.

Veganism is the practice of abstaining from the use of animal products—particularly in diet—and an associated philosophy that rejects the commodity status of animals. A person who follows the diet or philosophy is known as a vegan.

Veganism is the practice of abstaining from the use of animal products—particularly in diet—and an associated philosophy that rejects the commodity status of animals.