Like protein, fiber slows the rate at which your body plows through carb calories so you feel full for longer and maintain steadier blood sugar levels, one reason why research consistently links fiber intake to weight loss. That means fibrous whole grain bread tends to be a better choice than white bread and also explains why fruits, which contain fiber and valuable vitamins in addition to sugar, beat straight-up candy every time.
Dr. Smith applies this same idea to diet. He maintains that if you eat the same foods all the time, your body adjusts to that specific diet. Your metabolism stabilizes and fat accumulates as a result. By varying the types and quantities of food you eat, you’ll prevent your metabolism from slowing down and trick your body into burning more calories. In this way, diet confusion keeps your metabolism off-kilter and fuels your fat-burning engines.
In a way, moderate-intensity physical activity is that "magic pill" a lot of people are looking for, because the health benefits go beyond keeping your waistline trim: Not only can it reduce your risk of cancer, stroke, diabetes and heart attacks, but studies have shown that physical activity can significantly improve the moods of patients with major depressive disorders.