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If you follow the evolutionary path of human kind over the last few hundred thousand years, man evolved from a vegan diet to a mixed diet, with a large part consisting of animal protein.

Nothing wrong with vegan or mixed diet, as long as in moderation, and accompanied by an appropriate amount of physical activity - whether running away from competitive predators in the African Savannah tens of thousands of years ago, or doing an appropriate amount of exercise required required by the medically intervened low disease modern sedantry lifestyle we have today.