This may seem pedantic but I was at a gathering of my girlfriend's family and she made a referance to her ethnic culture's love of a tenderized roasted meat, to which I said "Yeah, like zombies attracted to flesh." Then we got into a discussion of zombie physiology. Now, popular lore has given us that zombies are acting on a primal instinct to feed. They don't need the sustenance, but are only going through a base desire. That being said, what happens to all the flesh that a zombie would consume? Do they ever feel full? Probably not since their ability to feel any kind of sensation is no longer there. Do they break down the food? Do they have stomach acid to do so? If so, would they defecate like any body that processes food? If their organs do not work, would they not consume until they burst their stomachs? Good guess that Romero never thought that one through, but wanted to see other's thoughts on the concept.