High fasting blood glucose and low blood glucose two hours after dinner can be controlled by diet and exercise, and should be evaluated in conjunction with the blood glucose value. If the fasting blood glucose is high enough to diagnose diabetes, medication is usually needed. Under normal circumstances fasting blood glucose should be less than 6.1 mmol/L, 6.1 to 6.9 mmol/L for impaired fasting glucose regulation, ≥ 7.0 mmol / L at the same time diabetic symptoms can be diagnosed as diabetes. If the fasting blood glucose is only mildly high, not yet reached the diagnostic standard of diabetes, and the blood glucose two hours after dinner is low, generally do not need to be treated with hypoglycemic drugs, so as not to cause hypoglycemia. Blood sugar can be regulated through diet control and appropriate exercise. However, if fasting blood glucose reaches the diagnostic standard of diabetes mellitus, diet and exercise alone can not effectively lower sugar, you need to take metformin, acarbose and other hypoglycemic drugs to control the condition, so as to avoid the blood glucose continues to increase. It is recommended to consult a doctor in a timely manner, the specific medication program should be carried out under the guidance of a professional physician, to avoid taking without authorization.