Zombie Attributes: Taste
Little is known about the altered taste buds of the walking dead. Zombies do have the ability to tell human flesh apart from that of animals, and they prefer the former. Ghouls also have a remarkable ability to reject carrion in favor of freshly killed meat. A human body that has been dead longer than twelve to eighteen hours will be rejected as food. The same goes for cadavers that have been embalmed or otherwise preserved. As to exactly why human flesh is preferable, science has yet to find an answer to this confounding, frustrating, terrifying question.