How does blood sugar change in a day?

Blood sugar is not constant in a day. The general rule is that blood sugar is low before meals and high after meals. But the blood sugar of normal people, whether on an empty stomach or after meals, should be kept within a certain range, that is to say, there is little change. Generally speaking, blood sugar is at its lowest point at 3 or 4 in the morning, but it is not lower than 60 mg/dl (3_3 mmol/l). The blood sugar value between half an hour and one hour after a meal is often the highest, but it is generally below180mg/dl (10.0mmol/l) and does not exceed 200mg/dl (11.1mmol/l) at most. Two hours after meals, blood sugar should be reduced to below 140mg/dl (7.8mmol/l). The production and utilization of blood sugar in normal people are in a state of dynamic balance and remain at a relatively stable level, because the sources and ways of blood sugar are roughly the same. Specifically, the sources of blood sugar include: ① digestion and absorption of food; ② It is decomposed from glycogen stored in the liver; ③ Transformation from fat and protein: In human body, sugar, fat and protein can be transformed into each other, and the process of transforming fat and protein into sugar is called gluconeogenesis. The ways of blood sugar include: ① oxidation to energy; ② Converted into glycogen and stored in liver, kidney and muscle; (3) It is converted into nutrients such as fat and protein for storage. Important organs regulating blood sugar in human body include: ① liver: regulating blood sugar by storing and releasing glucose; ② Nervous system: regulating blood sugar through eating, and indirectly affecting blood sugar through endocrine system; ③ Endocrine system: secreting various hormones to regulate blood sugar. The liver, nervous system and endocrine system jointly maintain the stability of blood sugar.