Carbs are essential for your brain, heart and nervous system to function properly, a constant supply of carbohydrate is needed. Once digestion has occurred, all forms of carbohydrate are converted into a sugar called glucose. Glucose is the main source of energy for muscles and other parts of the body.
Dietary fats are essential to give your body energy and to support cell growth. They also help protect your organs and help keep your body warm. Fats help your body absorb some nutrients and produce important hormones, too.
Your body uses protein to build and repair tissue. You need it to make enzymes, hormones, and other body chemicals. It is an important building block of bones, muscles, cartilage, skin, and blood.