Physical activity, more than diet, keeps the pounds from coming back
A study of 14 participants in the "Biggest Loser" TV show indicates that plenty of physical activity — "much more of it than public health guidelines suggest — is the key to preventing weight gain after significant weight loss, says the New York Times. "On average, those who managed to maintain a significant weight loss had 80 minutes a day of moderate activity, like walking, or 35 minutes a day of vigorous exercise, like running."