The normal value of blood glucose half an hour after a meal should be less than 11.1mmol/L. After eating, the gastrointestinal tract will digest the food and break it down into various trace elements that the body can absorb, such as sugar, which will lead to an increase in blood glucose, but will not be more than 11.1mmol/L. If the postprandial blood glucose is too high, you need to carry out a clinical diagnosis of the treatment, and take the medication that reduces the postprandial blood glucose, such as Gliclazide, which can target the action of the gastrointestinal tract and the liver, and can reduce the postprandial blood glucose. Gliclazide, which can be targeted to work with the gastrointestinal tract as well as the liver, can lower postprandial blood glucose. In addition, adjusting the sugar content of foods and the order of meals can also help to lower postprandial blood glucose. If left untreated it may cause diabetes and even affect the normal functioning of the pancreatic islets, at which point the medication needs to be taken strictly for treatment.