Courtesy of Scott Seiferheld

You diet. You exercise. You don't snack nearly as much as your "skinny" friends, but you still can't seem to lose weight. Registered dietitian Diane Kress, author and creator of the "The Metabolism Miracle" diet, says counting calories and hitting the gym won't mean a thing if you have a certain kind of metabolism -- "Metabolism B." This week on AOL Health, she explains signs indicating you might have "Metabolism B," how patients following her plan lost weight -- and regained their health -- and she discusses her own personal struggle with failed diets. Plus, the experts weigh in -- does her weight plan really hold up? Are there really different types of metabolism? Find out more about Metabolism B on AOL Health.