The next ingredient among energy boosting foods is lentil. Lentils provide both carbohydrates and protein, making them a great addition to any meal. They’re also a great source of fiber–which translates to a slow release of glucose–as well as B vitamins, iron, magnesium, potassium, zinc, calcium and copper. And they’re low in fat and calories to boot. If you don’t eat beans often, start with a small portion or you’ll experience the flatulence factor and end up dining alone. Some other good choices include navy beans, chickpeas and kidney beans. 1 cup boiled lentils: 290 calories, 40g carbs, 18g protein, 1g fat.