Harvard psychiatrist Dr. Steven C. Schlozman has offered a theory of sorts on "necro-diagnostics," which was part of the "Science on Screen" lecture series at the Coolidge Corner Theatre in Brookline, Mass.
Read A Harvard Psychiatrist Explains Zombie Neurobiology by Mark Strauss
"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."