When John Melillo met Pat in high school, he says she was the prettiest girl he ever saw. The couple, who've been living the good life in Long Island, N.Y., have been married 36 years and now have two children, Bret and Beth. Pat, who is 5'4" and weighed 110 pounds, began suffering from stomach problems five years ago. When her doctor recommended a low fat diet, Pat took his advice to a dangerous extreme – and went on a diet that spiraled out of control. Correspondent Peter Van Sant reports on her story.