Blood glucose is glucose in the blood and the function of blood glucose is mainly to provide the energy needed for the movement of various organs in the body. The 2-hour postprandial blood glucose is the blood glucose measured 2 hours after the first bite of food. The normal range of 2 hours postprandial blood glucose varies from person to person, and the standards are as follows: I. General population: Normal general population with no special physical disease, the normal range of 2 hours postprandial blood glucose is 4.4-7.8 mmol/L. If the blood glucose is <3.9 mmol/L, it is considered as hypoglycemia; if the blood glucose value is between 7.8-11.1 mmol/L, it is called hypoglycemic tolerance, i.e. diabetes prediabetes; if the blood sugar of 2 hours after meal is ≥11.1mmol/L, it is recommended to go to hospital to do intravenous blood sugar test to confirm whether diabetes occurs. Second, diabetic patients: 1. Young diabetic patients: patients have no complications, have not had myocardial infarction, cerebral hemorrhage, cerebral thrombosis, nor hypertension, but simply high blood sugar, it is best to control the 2-hour postprandial blood sugar at 7.0-8.0mmol/L to reduce the emergence of various complications. The higher the blood glucose value, the more prone to various infectious diseases, because high blood glucose is a good medium for bacteria, viruses, fungi and mycoplasma; 2. Older diabetic patients: at the same time, they have many primary underlying diseases, including cerebral thrombosis, cerebral hemorrhage, lacunar cerebral infarction, etc., coupled with mobility problems, the 2-hour postprandial blood glucose range can be appropriately relaxed and decided according to the specific situation, generally 8.5-8.5 mmol/L can 9.5 mmol/L can be regarded as normal. If elderly patients control their blood sugar as normal as ordinary people, if they do not eat enough, hypoglycemia can easily occur, and it is very dangerous for elderly people to have hypoglycemia; 3, women with gestational diabetes: during pregnancy, normal postprandial 1-hour blood sugar ≤ 10.0 mmol/L, postprandial 2-hour blood sugar ≤ 8.5 mmol/L, fasting blood sugar ≤ 5.1 mmol/L, any point exceeding the above Gestational diabetes can be diagnosed if any of the above values are exceeded. The degree of 2-hour postprandial blood glucose control is mainly closely related to the individual. If the general population occasionally has a 2-hour postprandial blood glucose rise, it should be looked at to see if it is a meal that is too much, which may lead to a transient blood glucose rise. When the diet returns to normal, blood glucose can generally return to normal.