Two hours after meal, blood glucose is lower than fasting blood glucose in the following cases: First, fasting blood glucose is high due to various reasons, such as hypoglycemia in the middle of the night or during sleep, the body will react to the protective mechanism, which will lead to the increase of fasting blood glucose. Second, the dawn phenomenon, the secretion of insulin antagonistic hormones, such as growth hormone and cortisol, increases significantly in the early morning, which will lead to high fasting blood glucose. Third, when diabetic patients undergo glucose-lowering treatment, the oral medication is mainly for postprandial glucose treatment, and there will be good control of postprandial glucose, but fasting glucose is in a high state. For this situation, we need to see what causes the fasting blood sugar to rise, and then adjust the glucose-lowering drugs appropriately, so that the fasting blood sugar will also fall to a more desirable range.