What causes low blood sugar after meals?

The causes of low postprandial blood glucose are as follows: 1. In the absence of hypoglycemic drugs or hypoglycemic measures, low blood glucose is lower than 3.9mmol/L. Normally, consider whether the previous meal is normal, and secondly, see whether there is a delay in islet peak secretion. If there is a delay in islet peak secretion, it is early stage of type 2 diabetes. OGTT is needed to confirm whether there is type 2 diabetes. 2. Postprandial hypoglycemia during the application of hypoglycemic drugs or during insulin injection requires adjustment of preprandial hypoglycemic dose and adjustment of preprandial insulin subcutaneous injection dose. In addition, patients should monitor their fasting blood glucose and 2 hours after meals, and adjust the dosage of medication according to blood glucose conditions.