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Meat is not necessary for a healthy diet. We, as species, do not evolve as carnivores. So our biology, our tooth anatomy, our body, our metabolism do not evolve over the need of meet. We evolved eating seeds, fruits, veggies as the basic diet. Meat in diet came as a cultural feature very recently in terms of evolutionary time span.

Also many great civilizations in their cosmology has set the origin of humankind as evolving from corn, for example. The basis of this civilization early settlements was corn in America, wheat in Europe, rice in Asia and sorghum in Africa.

Personally, to eat meat, promotes the needless killing of sentient beings, the deforestation of tropical woodlands, the emission of methane that promotes greenhouse effect, the use of seeds for animals -corn and sorghum- needed to feed many countries suffering of famine and overall, it promotes the unnecessary suffering of sentient beings.