Postprandial blood glucose generally refers to the result of blood glucose measurement 2 hours after eating, whether it is 12mmol/L for general population or 12mmol/L for diabetic population, it is high. The general population can check fasting blood sugar again or recheck postprandial blood sugar, because in some stressful situations, excessive secretion of glucagon can make postprandial blood sugar suddenly reach 12mmol/L, such as pregnancy, childbirth, surgery, mood swings, eating too many carbohydrates at one time, etc., which may cause postprandial blood sugar to rise. When the stress factors are removed, blood sugar can return to normal, which is a transient hyperglycemia. The normal person’s postprandial blood sugar value is less than 7.8mmol/L. If the postprandial blood sugar is still greater than 11.1mmol/L after retesting, it indicates that diabetes may exist. Diabetic patients 1. Poor dietary control: It indicates that the patient’s control is not up to standard, and it is possible that the patient’s current diet is not thoroughly controlled. The diet of diabetic patients should be arranged according to the standard weight, there is a simple formula, height minus 105 is the patient’s standard weight, according to 30 kcal/kg of calories, total control of carbohydrates, fats, proteins, fruits, generally there is not too much restriction on vegetables; 2, insufficient exercise: exercise can increase the sensitivity of peripheral tissues to insulin, to achieve the lowering of blood sugar effect. Diabetic patients who have diet control without proper exercise may also lead to elevated blood glucose; 3. Poor treatment plan: the current treatment plan is not appropriate, or the amount of hypoglycemic drugs used is not enough, or the amount of basal insulin is not enough can also lead to high blood glucose, it is recommended that patients go to the hospital to readjust the treatment plan; also check whether diabetic patients are combined with some other infections, such as respiratory tract infection, urinary tract It is also necessary to check whether diabetic patients have other infections, such as respiratory tract infections and urinary tract infections, which can lead to substandard blood sugar control after meals.