The first bite of a postprandial blood glucose test refers primarily to any food that contains calories, and also includes staple foods. Postprandial blood glucose test generally refers to a blood glucose test two hours after a meal, and is required to start counting from the first bite of the meal, where the meal refers to any food containing calories, including staple foods, but also other foods such as vegetables, fruits, and meats. After eating food, blood glucose will begin to rise, and the corresponding insulin level will also rise, and diabetic patients with abnormal insulin secretion leads to blood glucose can not be controlled by insulin, blood glucose elevation, the normal two-hour postprandial blood glucose concentration should be less than 7.8mmol/L. If you are not sure about the postprandial blood glucose test, you can go to the hospital and consult a professional doctor.