When it comes to endurance performance, carbohydrates that are rapidly digested and absorbed are ideal. But instead of reaching for an energy gel, you might be better off picking up a potato. Researchers compared the effectiveness of potato puree and energy gels to fuel trained cyclists over a two-hour cycle, followed by a time trial. They found potato was just as effective as the energy gels in sustaining performance and blood glucose levels. Potatoes are also a surprisingly good source of many performance nutrients, including B vitamins, potassium, manganese, magnesium and vitamin C.