Diabetic patients often encounter the phenomenon that fasting blood sugar is higher than postprandial blood sugar, the reasons for which are the following possibilities: 1. The more common reason is that in the fasting state the body secretes hormones that antagonize insulin, like cortisol hormone or growth hormone, which will lead to high fasting blood sugar, also known clinically as the dawn phenomenon. 2. Patients have undetectable hypoglycemia at night, the human body will naturally have a The protection mechanism, rebound to increase blood sugar, as soon as possible to correct the hypoglycemia, blood sugar level increases after the patient will lead to high fasting blood sugar. 3, with the patient’s diet control is not strict, especially after dinner eat more or at bedtime to add meals, will also lead to high fasting blood sugar. 4, diabetes patients in taking hypoglycemic drug therapy, may be many drugs mainly focus on reducing postprandial The effect on fasting blood glucose is not much, so it will also produce the situation that fasting blood glucose is higher than postprandial blood glucose.