Owsley Stanley, known as the Bear, has eaten an all-meat diet for nearly 50 years. When he was young, he read that Eskimos ate only meat and fish, yet were very healthy and fit. This convinced him that humans are meant to be purely carnivorous. "I have eaten as a total carnivore for 48 years," he says. "I am nearly 72 and I have much the same body as I did at 30."...

Stanley had a heart attack in recent years, but he blames it on the broccoli and other "poisonous" vegetables his mother used to feed him as a boy.