High fasting blood glucose should first identify the cause of the disease and then treat the cause. High fasting blood glucose is commonly caused by excessive intake of dinner, hypoglycemia in diabetic patients at night, dawn phenomenon, etc.. Fasting blood glucose can be lowered by changing lifestyle and adjusting insulin dosage. 1. Excessive dinner intake: Consuming too much sugar-rich food such as rice and milk tea at dinner will lead to elevated fasting blood glucose, which is not conducive to good health. It is important to eat reasonably, choose low-salt, low-fat and low-calorie foods, and choose suitable exercises to regulate your lifestyle, which is conducive to blood glucose stabilization. 2. Diabetic patients with nighttime hypoglycemia: Somogyi effect is the occurrence of hypoglycemia at night, the body’s insulin antagonist hormone increases, and the occurrence of hypoglycemia after the rebound hyperglycemia. In this case, it is necessary to measure blood glucose several times at night to identify the cause of elevated fasting blood glucose. Adjust the insulin dosage as prescribed by the doctor. 3. Diabetic patients with dawn phenomenon: that is, early morning cortisol, growth hormone and other hormones that can lead to increased blood glucose secretion, resulting in high blood glucose in a short period of time at dawn. It is necessary to adjust the insulin dosage according to the doctor’s prescription. When symptoms of high fasting blood glucose appear, go to the hospital in time and regulate the blood glucose level under the doctor’s guidance.