It must have felt unnatural at first, to eat animal flesh. After all, we’re not so far removed from animals ourselves. Perhaps it even felt cannibalistic. There might not have been that much intellectual distinction between humans and other animals. When humans were pure vegetarians, they were living in harmony with the earth and with the other creatures co-habiting the planet with them. Their closest animal relatives, apes, were vegetarians. Eating the products of the earth, like plants, grains and fruits that they could gather and eat would have seemed the natural order of things.