Fat: A necessary nutrient

Fats are required by the body to function properly. Besides being energy source, fat is a nutrient that has the component required in the production of cell membranes, as well as in several hormone-like compounds called eicosanoids. These compounds help regulate blood pressure, heart rate, blood vessel constriction, blood clotting and the nervous system. In addition, dietary fat is essential for the absorption of fat-soluble vitamins - vitamins A, D, E and K - from the food into the body. Fat also helps maintain healthy hair and skin, protects vital organs, keeps your body insulated, and provides satiety - a sense of fullness after meals.
However, too much fat can have negative impact on health. Eating large amounts of high-fat foods adds excess calories, which can lead to weight gain and obesity. These foods add weight and excess burden on health.
Obesity is a risk factor for several diseases, including diabetes, heart disease, cancer, gallstones, sleep apnea and osteoarthritis. And too much of certain types of fat - such as saturated fat or trans fat - can increase your blood cholesterol levels and your risk of coronary artery disease.