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if walkers are dead they have no metabolisme and no need for nourishment. If they did, then normalregeneration of cells should occur, and they would not rot as they do.
Also if a walker eats alotover a long period of time, would it get fat?
I would say specifically to the lore of this program based on Shane's transformation. The ravenous animal instinct that takes over the victim causes them to want to feed and prey constantly.