Unsaturated fats are usually liquid at room temperature. They are usually extracted from seeds. Many people consider fat a substance to be avoided at all costs. However, the body needs fat. Fat provides protection for some of the body's organs by holding them in place and cushions any impact.
Women usually have an extra layer of fat under their skin which helps insulate body temperature.
Fat also aids in the absorption if fat-soluble vitamins and minerals in the small intestine. In theory, when too few calories are eaten, the body should burn its stores of fat and weight loss should occur. However, the central nervous system can only burn carbohydrates. When carbohydrates are not available, the body turns to protein stored in muscles and organs. This in turn slows the metabolic rate.