Blood glucose before noon meal should be <6.1mmol/L if it is fasting blood glucose; blood glucose before noon meal should be <11.1mmol/l if it is random blood glucose; blood glucose before noon meal should be <7.8mmol/l if it is 2 hours after meal. 1. Fasting blood glucose refers to the value of blood glucose measured after overnight fasting (at least 8 to 10 hours without any food, except drinking water), normal people's fasting blood glucose should be <6.1mmol/L. If the blood glucose before lunch is fasting blood glucose, it should be <6.1mmol/L. 2. Random blood glucose refers to the blood glucose value measured at any moment, normal people's random blood glucose should be <11.1mmol/L. If the blood glucose before lunch is random blood glucose, it should be <11.1mmol/L. 3. 3. Postprandial blood glucose generally refers to the blood glucose value measured 2 hours after meals, normal people's postprandial blood glucose should be <7.8mmol/L. If the blood glucose before lunch is postprandial blood glucose, it should be <7.8mmol/L. If there is any blood glucose abnormality, it is recommended to take prompt action. If abnormal blood glucose occurs, it is recommended to consult a doctor in time.