Nathaniel in fourth grade in 1996.

In the fifth grade, Nathaniel stopped eating and started running. He would run two miles and, an hour later, run two more. “He wouldn’t eat anything with any fat or sugar in it,” says his mother, Judy. “He suddenly became concerned about a little roll of flesh under his belly button. It was like a 20-year-old woman who wants to lose 10 pounds for her wedding.”