Insulin is an important hormone that regulates blood glucose, secreted by pancreatic beta cells, and insulin is the only hypoglycemic hormone in the body. The most important factor regulating insulin secretion is blood glucose. When the blood glucose level is greater than 5.6mmol/L, it will promote the secretion of insulin. Increased secretion of insulin can promote the uptake and utilization of glucose, and promote the conversion of glucose into glycogen to store up, and insulin can promote the synthesis of proteins and fats, and inhibit the decomposition of proteins and fats, so that the raw materials for gluconeogenesis will be reduced to achieve the purpose of lowering blood glucose. In addition to regulating insulin secretion, there are also insulin antagonist hormones, such as growth hormone, cortisol, catecholamines, including epinephrine and norepinephrine, glucagon and so on, all of which are insulin antagonist hormones, and have the effect of elevating blood glucose. When the secretion of the antagonist hormone of insulin increases, the body will promote the secretion of insulin to maintain the dynamic balance of blood glucose.