Insulin has a variety of effects such as promoting the anabolism of three major substances, especially affecting glucose metabolism and influencing blood glucose levels. Insulin in glucose metabolism can play a hypoglycemic effect by reducing the sources and increasing the routes of going, and can promote the storage of triglycerides into fat cells. 1. Insulin is closely related to glucose metabolism, inhibiting glycogenolysis and gluconeogenesis, assisting glucose transport into fat and muscle cells, stimulating glycogen synthesis, and increasing glycolysis in fat and muscle. 2. In fat metabolism, insulin plays a role in coordinating the utilization of sugar and free fatty acids, and promotes the storage of triglycerides in adipocytes. 3. In protein metabolism insulin promotes amino acid transport, induces protein synthesis, and inhibits protein catabolism. When there is an absolute lack or resistance of insulin, it may lead to type 1 or type 2 diabetes mellitus, so insulin is one of the very important hormones in the body’s metabolism. Seek medical attention if you feel unwell.