Hi, The best fuel for muscles is
carbohydrates, either simple sugars such as naturally occurring sugars in fruits and juices or complex carbohydrates the starches in whole grain products, rice, cereal, oatmeal and other plant foods. These carbohydrates provide not only energy but also important vitamins and minerals. You store only carbohydrates not protein or fats in your muscles in the form of sugar called glycogen. During hard exercise, you burn this glycogen for energy.