The function of carbohydrates is to provide the body energy for physical activity and the operation of internal organs. The digestive system converts carbohydrates into glucose, which flows through the blood stream for immediate use or for later use in the liver and muscles.
Every cell in the body requires carbohydrates for normal function. Consuming too many carbohydrates may result in excess calories that are stored as fat. However, consuming too few carbohydrates leads to malnutrition and fatigue.
Carbohydrates should account for 40 to 60 percent of a person's total daily caloric intake. Foods high in carbohydrates include fruits, vegetables, bread, cereal and milk.