Why did Dan O Bannon make the dead eat brains?
Simply to distinguish them from Romero s well-known flesh eating variety. When Fox and O Bannon discussed making it different from the Romero films, they wanted to explain why they ate any human parts at all. Dan knew he had to make it seem as if Romero s movies were telling their own story not the real story. Humans targeted the brains of the corpses in the Romero movies when the truth was human brains were the targets of the walking corpses. Dan figured that the brain, containing the central nervous control would be a logical meal literally brain food, to keep these dead bodies wired. It would also make the film less viscerally gory.