Tarrare

...he was hospitalised and became the subject of a series of medical experiments to test his eating capacity, in which, among other things, he ate a meal intended for 15 people in a single sitting, ate live cats, snakes, lizards and puppies, and swallowed an eel whole without chewing. Despite his unusual diet, he was of normal size and appearance, and showed no signs of mental illness other than what was described as an apathetic temperament. via @black_cat_belle