A normal person’s blood glucose value 2 hours after a meal should be <7.8 mmol/L. Under normal circumstances, the blood glucose value 2 hours after meal should be <7.8mmol/L. If the blood glucose value 2 hours after meal is ≥11.1mmol/L, accompanied by symptoms such as polyphagia, polydipsia, polyuria, weight loss, etc., diabetes mellitus can be diagnosed. If the patient's 2-hour postprandial blood glucose is 7.8 to 11.1 mmol/L it is impaired glucose tolerance. For patients without symptoms of diabetes, just one 2-hour postprandial blood glucose elevation and meet the diagnostic criteria for diabetes can not be clearly diagnosed, need to review the fasting venous blood glucose, 2-hour postprandial blood glucose, glucose tolerance test, etc. on another day to clarify the diagnosis. If the diagnosis of diabetes mellitus or impaired glucose tolerance is confirmed, it is necessary to go to the hospital for treatment according to the glucose-lowering program formulated by the professional doctor, and pay attention to a low-glucose diet and appropriate exercise in daily life.