The role of medium chain triglycerides belongs to one of the sources of dietary fat and is found in the body as fat. Medium-chain triglycerides have less molecular mass, can be dissolved in water, and have better compatibility with various organic solvents as well as fat-soluble vitamins. They can be digested, absorbed, operated and metabolized in the body, and the speed of digestion and metabolism in the body is twice as fast as that of glucose, and they can produce energy higher than that produced by glucose. Medium-chain triglycerides inhibit gastric emptying effect on the gastrointestinal tract and reduce the amount of fat loss and leakage caused by lymphatic fistula in surgical patients. Medium-chain triglycerides can be used in functional foods, daily meals, sports foods, and energy drinks. The principle of medium-chain triglycerides is to take small amounts with frequent meals; too much at one time can cause bloating and abdominal pain.