Interesting. Maybe this article could help:
Energy in Energy out
If zombies eat brains, then they poop. What goes around, comes around.
Depends on the type. Are they dead, or somewhat still alive?
Canon dictates that your classic "Romero-type 'Supernatural' risen-undead zombies" can eat, but do not poop, lacking as they do any of the metabolic processes required. Due to a combination of impaction and trapped gasses produced by bacterial action, they just sort of swell up and burst open. Depending on their state when interred, and their current state of decomposition. Those that had undergone a post mortem would tend to split open at the seams of the Y incision. Then they just sort of drag whatever hangs out around with them. Can't poop.
Biological zombies: Caused by a strange alien disease or a bacteria organism. Parasites modify the host creature’s behavior. Can poop.
Chemical zombies: Strange chemicals are discovered and are meant to bring back the dead to life, or zombify the living. Might poop.
Technological zombies: Involve the use of advanced technology to bring the dead back to life, or zombify the living. Might poop.
Constructed zombie: Remains of other creatures are used to create the zombie. Depending on condition (living or dead) Might poop.
Magic zombie: Zombies come as a result of the powers possessed by witches, sorcerers, etc. The powers are used to reanimate the dead, and follow the will of the creator. Being reanimated dead, can't poop.
There are more, but this is just a basic overview. https://zombie.fandom.com/wiki/Types_of_Zombies
They ooze..
They have to. Otherwise it would get big and explode.
They don't exist, so no they don't poop.
recycled waste
They would have gastropheresis from those nerves being dead and they would probably just have their guts rupture and and a trickle of their internals and injested food would leak out their asses.
If you don't eat, you don't shit. If you don't shit, you die.
So, are zombies "alive"? Becomes the pertinent question.
An interesting philosophical question. Consider the majority of citizens in your country. I consider them zombies, they eat, breath and have motor skills. That is about all. Their brains are dead, their eyes are lifeless, their mouths repeat things they hear without understanding. You can consider them alive in the sense that if they don't eat for an extended period of time, they assume room temperature. Then they can't hurt anyone.
They are undead, therefore the answer would be no. So the matter remains in the corpse until it eventually explodes or vomits the toxic matter.
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