Zombies are big eaters.
It’s one of their defining characteristics.
And they don’t stop eating,
They find life, in the movies in human form, occasionally in animal form, and they consume it.
There are occasionally scenes where zombies don’t seem to go after fresh food. Usually because they’re already eating. Occasionally in a movie you’ll see a zombie chowing down on someone and a few other survivors are able to sneak by. It’s like an animal who has some prey that it’s munching on for lunch. Like a lion, and a gazelle that manages to sneak by while the lion is otherwise distracted.
It’s very rare for us to see a zombie who is satiated. You hardly ever see a zombie who says, “No thanks. I’ve had enough human for now. I’ll just stop eating. I’m full. I’m on a diet. I’m trying to lose a few pounds.”
There was one zombie however, in an episode of The Walking Dead, who apparently was just that. Totally satiated. After Rick’s wife Lori died giving birth in the bowels of the prison we don’t get to see her corpse. Not that we really need or want to. But even though someone might have been curious about it, we aren’t shown the corpse. Just a walker. And a unique walker in that he has so stuffed having engorged himself by chowing down on the remains of Lori’s corpse that he can barely lift his arms or even menace Rick as he walked in the room. We are lead to believe that he has completely devoured Lori. Which I think is actually kind of funny from a writing point of view because even her head seems to have been devoured.
I can only imagine the incredible indigestion she must’ve given that zombie.