Anthropologists will tell you that the reason people never dined regularly on other people is economics. While there existed, I am told, cultures in Central America that actually ranched humans—kept enemy soldiers captive for a while to fatten them up—it was not practical to do so, because you had to give up more food to feed them than you’d gain in the end by eating them. Carnivores and omnivores, in other words, make lousy livestock.

Mary Roach, Stiff: The Curious Life of Human Cadavers (2003)