The carbohydrates in ripe bananas are already in their simplest form, and can be digested easily with a minimum of energy loss. The sugars in bananas are called glucose and fructose. Glucose is the most easily digestible sugar. It gets into your bloodstream rapidly and can be utilized for a quick release of energy. The fructose is absorbed more slowly, and thus it provides a more lasting fuel release.
Bananas are famous as a good source of potassium, a mineral involved in proper muscle contraction.
Insufficient potassium is one of the main causes of fatigue, muscle cramping and dehydration. It is wise to eat bananas before, during, and after long bouts of activity, and after shorter, more intense sessions. A good idea for energy is to have the daily lunch meal revolve around bananas. Five bananas plus other fruits and vegetables will leave you alert and with enough fuel to last the rest of the day. Consult with your physician before starting any dietary program.