Many societies practiced human sacrifice. However, they made war to enslave as many prisoners as possible and sacrificed a few to please their gods. Only Azteks ate all their prisoners, and even had a term " Corn-man" for them. They did not practice husbandry and animal flesh was not easily available. But to satisfy hunger one needs fat, and even milkfat was not available ( even vegetarian Jainists have unlimited supply of ghee). Corn oil?
one can get protein from beans but as the only source it is inefficient. Large amounts of beans? Dread to think about gastrointestinal consequences
