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Originally Posted by Rathji
Depends on the zombie, but a 'traditional zombie' who is reanimated dead, won't starve to death. Zombies that are the result of a virus mutation and as such are not really undead could very well starve, like in 28 Days Later.
We don't know a lot about the zombies in The Walking Dead (from the TV series alone), but they seem to be reanimated, and as such, I would find it unlikely that they would starve to death.
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They sort of touched base on this (from the parts that I saw,) on The Talking Dead - about how the "fresher" the zombie, the faster and more agile they are, where as the "older" the zombie, the slower and more clumsy they get due to decomposition. So I assume if they're subject to decomposition, they'll eventually rot away to nothing after about the 28 day mark.
I would have to assume that rigor mortis would play a roll in a zombie's functionality between the three to twelve-hour mark as well.
Personally, I've always wondered that if it's a virus that is reanimating the body, if you don't really "kill" a zombie, but paralyze one. Like, by severing the head or destroying the brain, you are effectively removing the virus' control over the host's nervous system - thus why you can't kill them any other way.