Quote Originally Posted by CosmicTraveler View Post
Well, if we're talking Walking Dead here then they do. As the zombies have been shown to decay to a point of being unable to move without eating. Even though they're still... undead... like... able to move... You get what I mean.
I kind of felt that it has never been fully explained. With regards to the tv show, they gut a zombie looking for Sophia remains, and the woodchuck was there undigested.

Overall, I can see them processing food, since being reanimated as given them basic functions of other senses it is not much of a reach for them to process food. It actually keeping them from rotting though? That would also mean that there is full on blood circulation going to deliver said nutrients to the various body parts etc. If that is occurring then wounds would continue to bleed and fester and rot from bacteria and other general infections, like massive total body gangrene.

I tend to think that the process of eating is more so just mechanical from the small part of the brain. Perhaps, as some actual viruses (rabies) do, they biting is a function that serves the virus to spread from host to host, not so much of a conscious decision on the host part.