Tarrare

"In the unsavoury annals of polyphagy, the worst glutton of all time was the Frenchman known as Tarrare. ... Among their experiments, Tarrare was given a live cat, which he devoured after tearing its abdomen with his teeth and drinking its blood. He later vomited the fur and the skin. The doctors also fed him live puppies, snakes, lizards and other animals, and Tarrare refused nothing. Contrary to the imagined stereotype of a glutton, Tarrare was pale, thin and of medium height, and of apathetic temperament. His fair hair was uncommonly soft; his mouth enormously wide; and the enamel of the teeth much stained. He sweated profusely and was always surrounded by a malodorous stench which got even worse after his nauseating feasts."

http://www.forteantimes.com/articles/151_cateaters.shtml