With the awareness and understanding of diabetes, sugar lovers are aware of the importance of blood glucose measurement, and also know that blood glucose will fluctuate with food, activity and other conditions. Therefore, measuring fasting blood glucose has become an important task for sugar lovers to self-test. However, in practice, we find that many sugar lovers often mistakenly believe that the blood glucose value measured when they are hungry is fasting blood glucose, which is a big mistake. This is a big mistake. Because in real life, starvation is sometimes only three or four hours or five or six hours without food, the blood glucose measured in this case is not the fasting blood glucose that is often said in medicine. So what is fasting blood sugar? Fasting blood glucose is the blood glucose value measured by blood taken after fasting (usually at least 8 to 10 hours without any food, except water). The reason why fasting blood glucose is the most commonly used indicator for diabetes is that it determines the blood glucose level throughout the day, because fasting blood glucose can reflect the functional status of pancreatic beta cells, so fasting blood glucose is one of the important indicators for clinicians to analyze the patient’s condition. So how should fasting blood glucose be measured for sugar lovers? When is the best time to measure fasting blood glucose? How should fasting blood glucose be measured? Fasting blood glucose is best measured in the early morning from 6:00 to 8:00 a.m. Before taking blood, no glucose-lowering drugs, no insulin, no breakfast and no exercise are required. If the blood is taken too late on an empty stomach, the measured blood glucose value will not truly reflect the patient’s treatment effect, and the result may be high or low. What is the best time to measure fasting blood glucose? The best time to test fasting blood glucose is between 8 and 12 hours after a meal, so the morning is the best time to draw blood. Please note that the night before the blood draw, you should eat normally, and do not drink alcohol, and do not drink coffee or strong tea after meals. Do not eat anything when you get up the next morning, and drink as little or no water as possible. Also, avoid getting too emotional and doing too strenuous activities. The best time to draw blood is between 6 and 8 a.m., so that the blood specimen can reflect the true condition of the sugar patient. In addition, I would like to remind you that diabetes control is a full time process, that is, not only fasting blood glucose should reach the standard, but also postprandial blood glucose should be reduced to a certain level before diabetes control is considered effective.