One reason fat is important in the diet is because it
Too much dietary fat causes many health problems. However, it is important to have some fat in your diet; about 20 to 35 percent of your calories should come from a variety and balance of healthy fats (polyunsaturated and monounsaturated fats).Healthy fats are used by your body in several ways:1  Fat provides a highly-concentrated form of energy.2  One gram of fat gives you nine calories of energy, which is over twice that provided by carbohydrates or protein. 3  Fat enables your body to transport, store and absorb the fat-soluble vitamins A, D, E and K.ealthy fats are used by your body in several ways: 1  Fat provides a highly-concentrated form of energy. 2  One gram of fat gives you nine calories of energy, which is over twice that provided by carbohydrates or protein. 3  Fat enables your body to transport, store and absorb the fat-soluble vitamins A, D, E and K.