walking dead's rick looking at a zombie In The Walking Dead, the undead Walkers are living cadavers – mindless zombies who live only to eat human flesh, rending innocent people apart with just their teeth and hands. It may seem hard to believe that concept could get any darker, but a revelation from the franchise’s creator will have fans seriously grossed out.

In the recent Walking Dead #111 – from Robert Kirkman, Charlie Adlard and Dave McCaig – a fan writes in asking about zombie physiology. Specifically, they want to know what happens after a zombie consumes human flesh. Can the undead digest what they eat, and what happens once they’re full? Kirkman’s answer exposes the gross truth.

Walking Dead Caged Zombie Walker

In response, the Walking Dead creator writes that in his mind, his zombies are “always pooping,” constantly excreting their human victims. It’s a grim truth of the franchise that eating humans doesn’t even seem to give the Walkers sustenance. See below for Kirkman’s full comments.

Walking Dead’s Zombies Are “Always Pooping”

The Reveal Has Darker Implications Than It Seems

Comic book art: Zombie horde in full color, from The Walking Dead Deluxe

Zombie biology is a continuous mystery in the Walking Dead comics. While they seem to continue rotting over time, the undead can somehow move and (to a certain extent) think despite the cessation of biological impulses. One thing they don’t need to do is eat, with Kirkman confirming they don’t even digest the parts of human they end up swallowing. The writer states:

As haunting as it would be to live in a world where the undead stalk you as prey, it’s even darker to imagine the zombie horde constantly relieving itself as it goes, adding a gross edge to the zombie horror. This fact suggests that the zombies aren’t just predators but a potential biological disaster zone, especially in large numbers. While the early comics show small groups of Walkers, later events like the Whisperer War reveal groups that are thousands strong – on that scale, constantly pooping zombies could constitute an environmental disaster, unleashing a wave of bacteria and parasites in their wake.

Zombies as seen in The Walking Dead series finale

It’s particularly haunting that Walkers gain no sustenance from eating people and don’t even digest what they snap up. While most predators are part of the food chain, contributing in some way to the cycle of life, zombies exist outside that – they kill without giving, representing death in a way that other antagonists can’t. This fact raises more questions about what is keeping the zombies mobile for so long if they’re not even extracting nutrients from what they consume, but sadly it seems that just has to remain another unanswered question about the undead virus.

Walking Dead has always been one of the more practical explorations of the end of the world, as the focus on survivors working to create new societies and scrape by in a ruined world asks some very practical questions about the mechanics of survival. However, a few hardcore Walking Dead obsessives aside, Kirkman’s reveal about the zombie digestive system is probably insight most fans could have done without.

The Walking Dead #111 is available now from Image Comics.