Delayed insulin secretion refers to a delay in the peak secretion of insulin by pancreatic islet cells, which arises from impaired islet function. In normal people, basal insulin is 5-20 mU/L, which rises to a peak 30-60 minutes after oral glucose intake and falls to basal levels after 3 hours. If the peak occurs 1-2 hours or even longer after taking glucose it is called delayed insulin secretion. Delayed insulin secretion caused by impaired pancreatic islet function can be manifested as a decrease in insulin secretion or a decrease in the role of insulin in tissues, a decrease in the uptake and utilization of glucose by the liver and peripheral tissues of the body and a significant increase in blood glucose, which is the basis for the development of type 2 diabetes mellitus. Therefore, it is recommended that those who have delayed insulin secretion should clarify the cause of the disease under the guidance of a professional doctor and treat the symptoms in time to avoid serious elevation of blood glucose, which may lead to cardiovascular and cerebrovascular diseases.