Is 2-hour postprandial blood glucose important? How does it relate to islet function? For diabetic patients, 2 hours postprandial blood glucose is a very valuable monitoring indicator. 1. It reflects the reserve function of pancreatic islet B cells, i.e. the ability of pancreatic islet B cells to secrete insulin after eating. If the reserve function of pancreatic B cells is good and the surrounding tissues are sensitive to the action of insulin, the blood glucose value should drop below 140 mg/dL 2 hours after meal. If the reserve function of pancreatic B cells is good or even higher than normal, but there is obvious insulin resistance; or insulin resistance is not obvious, but the function of pancreatic B cells has been poor, then the blood glucose 2 hours after meal can be significantly increased. 2.If the blood glucose of 2 hours after meal is >200 mg/dL, it is easy to have chronic complications such as diabetic eye, kidney and nerve. For middle-aged people and those who are not in serious condition, the 2-hour postprandial blood glucose should be strictly controlled at 140 mg/dL or less; for elderly diabetic patients or those with serious complications, the 2-hour postprandial blood glucose can be relaxed to 140-200 mg/dL. 3. Many patients with type 2 diabetes do not have high fasting blood glucose, but have high postprandial blood glucose. Therefore, if only fasting blood glucose is checked, but not 2 hours postprandial blood glucose, it is easy to miss the diagnosis and treatment. 4. 2 hours postprandial blood sugar can better reflect the amount of food and whether the use of hypoglycemic drugs is appropriate, which cannot be replaced by fasting blood sugar only. 5. 2 hours postprandial blood glucose neither affects normal medication or injection, nor normal eating, so it does not cause special fluctuation of blood glucose. How to monitor the 2-hour postprandial blood glucose? There are two ways to monitor blood sugar 2 hours after meal, one is to do glucose tolerance test after taking 75 grams of anhydrous glucose orally, and the other is to eat 100 grams of buns or instant noodles made of flour (the sugar content is equivalent to 75 grams of anhydrous glucose, also called bun meal test). Many people with diabetes are aware of the importance of monitoring their blood glucose 2 hours after meals, however, they do not know where to count the exact time of 2 hours after meals. The correct concept of 2-hour postprandial blood glucose is to count from the time of the first bite and then measure the blood glucose value 2 hours later.