People who exercise daily, their metabolism rate is very high and the consume sugar, proteins and fat as a substrate for providing ATP molecules. The ATP molecules are then utilized by the body to perform physical work.
The physically active people when they require fat in their diets, the fats first will be stored in the muscle tissue as the cells there will use fat as a substrate for providing a large amount of energy that is 1 g of fat will provide 9 kcal.
