Not eating staple food for dinner does not necessarily reduce fasting blood glucose, but may lead to an increased probability of hypoglycemia at night. Therefore, it is not recommended to eat dinner without staple food to reduce fasting blood sugar, diabetic patients are recommended to eat on time, and at the same time can choose to take oral medication to reduce glucose treatment. 1. Fasting blood glucose reduction: not eating staple food at dinner, postprandial blood glucose will drop, if the blood glucose after dinner is only slightly lower than usual, the patient does not have obvious hypoglycemia at night, and the secretion of glucagon in the early morning does not change much with the previous changes, the fasting blood glucose of the second day may be lowered accordingly. 2. Elevated fasting blood glucose: if the patient does not eat the main food at dinner, and the blood glucose is obviously lowered after dinner, on the one hand, it may lead to hypoglycemia at night, which may affect the sleep, and on the other hand, the body’s glucose-regulating mechanism will be activated, and the secretion of glucagon and other glucose-gaining hormones will be higher than usual, which will lead to elevated fasting blood glucose in the morning of day 2. Therefore, not eating staple food at dinner may not necessarily reduce fasting blood glucose, and it is recommended to choose the appropriate treatment measures under the guidance of a doctor.