Lower postprandial blood glucose than preprandial blood glucose may be related to physiological factors, hormonal factors, drug factors and other reasons. 1. Physiological factors: too little food or too small a proportion of carbohydrates, as well as a large number of postprandial exercise may make glucose consumption too fast, resulting in postprandial blood glucose is lower than preprandial blood glucose. 2. Hormonal factors: blood glucose before breakfast is greatly influenced by hormones. In the morning, growth hormone secretion peaks in the human body, which antagonizes the action of insulin, resulting in high blood glucose before breakfast, and the hormone level gradually decreases after the meal, thus resulting in postprandial blood glucose lower than preprandial blood glucose. 3. Drug factors: diabetes application of certain hypoglycemic drugs or insulin, if the drug has a short duration of action and the dosage is large may lead to postprandial blood glucose lower than the preprandial situation. If the patient’s postprandial blood glucose value has not been improved, you need to go to the hospital immediately, do not judge blindly, so as not to delay the condition.