my favorite part:
The Ventromedial Hypothalamus
In the movies, zombies are always hungry, no matter how many supporting actors they consume. The most likely explanation is that zombies don’t have a properly functioning ventromedial hypothalamus: the region of the brain that lets you know whether you’ve eaten enough. The result is hyperphagia. Zombies will eat and eat and eat, but never feel satiated.
That raises a slightly awkward question: If zombies are constantly eating, then how come they never poop?
Schlozman doesn’t know for sure, but he has at least one promising theory: Maybe the living dead are constipated.
Now we know why zombies are always moaning.