Islet function in diabetics is generally difficult to restore and may improve. Low blood glucose after meals with insulin should be considered to be related to lifestyle adjustment and insulin overdose. 1. Lifestyle adjustment: If diabetic people diet excessively to reduce weight, making the daily intake of calories is insufficient; or after the meal to carry out a long period of strenuous exercise, excessive consumption of glucose, may lead to the phenomenon of postprandial low blood glucose. 2. Excessive insulin: If you do not follow the doctor’s instruction to use insulin correctly, and inject too much insulin, which does not match with the calorie intake, the glucose in the body will be broken down excessively, and low blood sugar after meals will occur, or even cause hypoglycemia. Diabetes mellitus should be reviewed regularly, and according to the results of blood glucose monitoring and changes in the condition, insulin dosage should be adjusted in a timely manner under the guidance of the doctor, and calorie intake should be reasonably arranged for each meal every day.