Fats circulating in the body are obtained from two sources, namely food and liver production, which can be stored in fat cells as energy reserves.
The function of fat is as a source of energy, protecting the body's organs, forming cells, a source of essential fatty acids, a means of transporting fat-soluble vitamins, saving protein, giving a sense of satiety and delicacy,as a lubricant, and maintain body temperature.
Most of the fat and oil in nature consists of 98-99% triglycerides. Triglycerides are glycerol esters. Triglycerides are formed from 3 fatty acids and glycerol. If there is a fatty acid in the bond with glycerol, it is called monoglyceride. The main function of triglycerides is as an energy substance. Fat is stored in the body in the form of triglycerides. When cells need energy, the lipase enzyme in fat cells will break down triglycerides into glycerol and fatty acids and release them into the blood vessels. Cells that need these components are then burned and produce energy, carbon dioxide (CO2), and water (H2O).