it's probably the first game in which so boldly presented cannibalism. You can add a few extra random pathology manifested by external characteristics, such as rotting teeth (movie "book of eli"), or yellowing of the skin (comicbook "Pilgrim"), so that the visible degeneration were chased by hunters and not allowed to enter the city.
and if so in another direction?
Character that for a long time in the game eats only plants could to satisfy the hunger of small quantities of plants, need more water, eat more often, etc. after the time change of diet on the meat was to cumbersome but possible.