Most sugar lovers think that fasting blood glucose is the blood glucose value taken in the morning after waking up and before eating breakfast, but it is not true. After waking up, the body will be in a state of readiness with the brain awake, and the level of various hormones in the body will start to change actively, and the blood glucose level will also change, especially for patients using insulin therapy, the blood glucose level is more likely to be high and low, and the blood glucose value measured at this time does not fully reflect the control level of blood glucose at night. In fact, the fasting blood glucose is not the blood glucose measured on a hungry stomach. Fasting refers to the blood glucose value measured immediately after waking up from an overnight fast of at least 8 hours. Therefore, the first thing you should do after waking up is to wash your hands with warm water, then test your blood glucose immediately and record the blood glucose value before doing other things. The fasting blood glucose test in this way is the accurate measurement result. If there is still some time after measuring fasting blood glucose until breakfast, you can test the results of blood glucose before breakfast and compare them with fasting blood glucose, so as to provide reference for adjusting medication.