The normal range of fasting blood glucose is 3.9-6.1mmol/L and 2 hours postprandial blood glucose does not exceed 7.8mmol/L. If fasting blood glucose ≥7.0mmol/L or 2 hours postprandial blood glucose ≥11.1mmol/L, accompanied by excessive drinking, excessive eating and If you suspect diabetes, you should go to the hospital for glucose tolerance test in time. If the fasting blood glucose is higher than normal but does not reach 7.0 mmol/L, it is called impaired fasting blood glucose. Impaired fasting glucose is a prediabetic condition, and about 8-10% of patients with impaired fasting glucose can become diabetic in the following year. In particular, patients with a family history of the disease, such as a father or mother with diabetes, have a child with a risk of developing diabetes that is four times higher than normal. If both parents are diabetic, the risk of diabetes in children is eight times higher than normal, and the older they are, the more likely they are to develop it. For some people over 40 years old who are obese and have complications such as hypertension, coronary heart disease, hyperlipidemia, hyperuricemia, etc., they must pay attention to control their weight and keep it within the standard weight, which can reduce the occurrence of type 2 diabetes.