Granola is a cereal-like combination of oats and other grains, often with nuts and dried fruits. A good source of protein, carbohydrates and fiber, granola is an excellent energy-giving food that also can be added desserts and baking. MayoClinic.com notes that some commercial brands may have added fats and sugars, making it high in calories. You can make your own granola or look for healthier varieties.