The hormone that lowers blood sugar is insulin, which is the only hormone in the body that lowers blood sugar. Insulin is a peptide hormone secreted by the beta cells of the pancreas. The role of insulin is to promote the uptake and utilization of glucose, to promote the conversion of glucose into glycogen reserves, to promote the synthesis of protein and fat, and to inhibit the breakdown of protein and fat. There are many glucose-raising hormones in the body, such as catecholamines, including epinephrine and norepinephrine, growth hormone, cortisol and glucocorticoids, which are all glucose-raising hormones and are antagonistic hormones of insulin. The body maintains the balance of blood glucose under the dynamic balance of insulin and insulin antagonist hormones. When the body does not produce enough insulin or too much insulin antagonist hormone, blood glucose will rise and even diabetes will occur.