Postprandial blood sugar mostly refers to 2h postprandial blood sugar. Generally speaking, normal people’s postprandial 2h blood sugar range is between 4.4-7.8 mmol/L, thus postprandial 2h blood sugar of 7.5 mmol/L is normal. If the patient is a normal person or an ordinary diabetic, it can be maintained, but if the patient is an elderly diabetic, it is necessary to be alert. Usually, if the blood sugar of normal people is below 7.8mmol/L and the blood sugar of diabetic patients is within 8.5mmol/L, the blood sugar status is up to the standard. At this time, patients can go to the hospital regularly to test their blood sugar. Diabetic patients can maintain their health and avoid complications by following the medical advice for treatment. If the patient is an elderly diabetic, it is recommended to check the blood sugar before the next meal to ensure that the blood sugar is controlled within 7.5mmol/L fasting and within 9.0mmol/L 2h after meal to prevent the occurrence of hypoglycemia. Since elderly patients are mostly affected by mobility problems, if no one is at home, the danger of hypoglycemia is more serious than hyperglycemia, so the blood glucose standard can be slightly relaxed. In daily life, patients with abnormal blood sugar should measure blood sugar regularly every day and follow medical advice for treatment. In addition, a low-salt and low-fat diet is needed to avoid aggravation of symptoms.