Peanut butter
Although peanut butter is a calorie-dense food, a little goes a long way in providing a great-tasting energy boost. Its healthy fats, protein, and fiber help stave off hunger and keep blood sugar levels stable. Instead of covering your morning toast with butter or jelly, which are devoid of protein and fiber, top slices with an all-natural nut butter that contains nothing but nuts, Berman suggests. Just be sure to avoid brands with added sugars and stick to a 2-tablespoon serving.