Food supplies both nutrients and calories (energy). All calories come from only three elements: carbohydrates, fats, and proteins. Micronutrients, on the other hand, are noncaloric food factors, such as vitamins, minerals, fibers, and phytochemicals. These noncaloric nutrients are vitally important for good health. The key to optimizing your health and achieving your ideal body weight is to eat predominantly those foods that have a relatively high proportion of nutrients (noncaloric food factors) to calories (carbohydrates, fats, and proteins).