system
Given the following post, respond as if you're commenting on Reddit:
human
[General Zombies] Do Zombies poop?

No, seriously. If we are to get to the science behind it, all organisms need to gain energy from other substances. There has to be a conversion process. Conversion process causes by products, in the case of animals, fecal matter.

So... Do they?
gpt
Whatever they eat simply collects in their digestive tract and stays there until it bursts.  There is no conversion process because it is not required.  A zombie no longer "grows" after it is created.  New muscle is not created, new skin does not grow, etc.