Do zombies need to eat to survive?
Season 1, Episode 4 shows a boy who starved to death in the attic and became a walker, but then there would still be no food for it, yet it 'survived' until Lee got there. In 400 Days, during Shel's story, it shows the 'watchdog' walkers being fed, why would they do this if zombies can't starve to death?
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Walkers can starve. It just takes longer than actual humans.
So yes, they need food.
If they don't eat for a very long time they decay so much that they end up becoming unable to move.