What sets apart the ‘Biggest Losers’ who keep off the weight

After competing in “The Biggest Loser,” many of the reality-show contestants have reluctantly regained the weight they sought to lose through extreme dieting and exercise. “The truth is, I kind of spiraled,” Ali Vincent, the first woman to win the competition, told Oprah last year. “I got home and I was like, ‘What do I do?’ “I’m supposed to be strong. I’m supposed to know how to do this.” But some contestants discovered