Talk about the ups and downs of dieting. Yo-yo dieting, a common pattern where people restrict calories to lose weight, then slip back into old eating habits before starting the cycle over again, has often been linked to more weight gain. But new research has turned the belief that this much-criticized diet habit is bad for you on its head, finding it may not be as bad as once thought. It’s estimated that up to 55% of American women and 35% of men have fallen into the yo-yo dieting trap that