You need more than 40 different nutrients for good health. Starches and sugar supply the body with energy. Dietary fiber provides bulk in the diet, which encourages regular elimination of wastes. FATS provide energy and are carriers of fat-soluble vitamins. Fats also add flavor to foods.
Some fats help form cell membranes and hormones.
They are needed for growth, maintenance, and replacement of body cells. They also form the hormones and enzymes used to regulate body processes. They do not supply energy, but they help release energy from carbohydrates, fats, and protein. They also help in other chemical reactions in the body. They are used to build strong bones and teeth, and to make hemoglobin in red blood cells.