Normal fasting blood glucose values are between 3.9 and 6.1 mmol/L; 2-hour postprandial blood glucose values should be <7.8 mmol/L. A fasting blood glucose between 6.1 and 7.0 mmol/L and a 2-hour postprandial blood glucose <7.8 mmol/L is called impaired fasting glucose. A 2-hour postprandial blood glucose ≥7.8 mmol/L but <11.1 mmol/L and a fasting blood glucose <7.0 mmol/L is called impaired glucose tolerance. The above conditions have a higher risk of developing diabetes and should be given early intervention, such as a low-sugar diet and reasonable exercise. Diabetes is diagnosed if fasting blood glucose ≥7.0mmol/L or 2-hour postprandial blood glucose ≥11.1mmol/L or random blood glucose ≥11.1mmol/L, accompanied by symptoms such as excessive eating, drinking, urinating and weight loss. When abnormal blood glucose is found, it is necessary to go to the hospital in time to get a clear diagnosis and standardized treatment under the doctor's guidance.