system
Given the following post, respond as if you're commenting on Reddit:
human
[Zombies] How do zombies decide when to stop eating a corpse?

Why don't they eat the person down to the bone? You see a lot of zombies with seemingly just a chunk missing out of their face or arm. Or maybe you just flat out see a zombie stop consuming after a few bites. What's the deal?
gpt
It depends on the lore. Sometimes, it's because they have some sort of hardwired instinct to leave enough meat for the corpse to be a functional zombie. Sometimes, it's because their dark master commands them to stop. Other times, they only go after fresh meat, so after they've been eating it for a little bit, it's not fresh any more and they have to find something else to eat. Sometimes they can sense the moment when the person zombifies and won't eat a fellow zombie. And sometimes, they'll keep eating until the new zombie stands up and shambles away.