How does human blood sugar change in a day?

(1) comes from the 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.

(1) is oxidized 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.

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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.

It can be seen from the schematic diagram of blood sugar fluctuation throughout the day that blood sugar changes 24 hours a day. After three meals, the blood sugar reached the peak three times and fell to the lowest point at night. During sleeping at night, blood sugar is in a basic state and will gradually increase after 4 or 5 in the morning. This is because of the role of growth hormone and adrenal glucocorticoid. Growth hormone is secreted during sleep (both day and night when hypoglycemia occurs), and the secretion is most mature after midnight.

The secretion of adrenal glucocorticoids is the lowest at 0 o'clock, and gradually increases after 0 o'clock. The secretion is very high in the morning, reaching a peak at 8 o'clock in the morning, and gradually decreasing after 8 o'clock until 0 o'clock at night. Due to the action of these two hormones, blood sugar will gradually increase in the morning, which is the so-called "dawn phenomenon".

Normal people secrete insulin no matter day or night, as long as their blood sugar is high, so their blood sugar will not increase significantly at dawn. Due to insufficient insulin secretion, diabetic patients can't control their hyperglycemia in the morning, so the dawn phenomenon is more obvious.

When the function of islet B cells is extremely poor, that is, there is basically no insulin secretion, once the diet changes, blood sugar will also change significantly.

If you eat too much, your blood sugar will be high; If you eat less, hypoglycemia may occur.

Therefore, patients should eat regularly and quantitatively. In case of dietary changes, the dosage of insulin (including oral hypoglycemic drugs) should be flexibly controlled to control hyperglycemia and avoid hypoglycemia.

Choose the activity amount and time according to the insulin action time and the meal situation.

For example, individual patients have high blood sugar after meals 1-2 hours, and hypoglycemia occurs after 3-4 hours with a little insulin. At this time, you can exercise for a while after meals 1-2 hours without changing insulin, and your blood sugar will be normal.

Fasting in the morning and before three meals are generally when blood sugar is relatively low. If you need exercise, you should be careful or avoid it.