Why do you get hungry when you sleep until midnight?

Why are you hungry? This is the feeling of the nerve center. We eat every day, and the food we eat is usually emptied from our stomachs in about 4-5 hours. At this time, the stomach will begin to contract violently. The time of gastric emptying is closely related to the composition of food. If it is a pure sugar food, it usually takes about 2 hours to empty. For protein food, it takes about 3-4 hours, while for pure fat food, it takes about 5-6 hours. Therefore, it is usually mixed for 4-5 hours.

The rate of gastric emptying is also directly proportional to the amount of food eaten. If there is 100 ml chyme in the stomach, about 5 ml is discharged every minute, and when the capacity of chyme in the stomach reaches 500 ml, 15 ml can be emptied every minute.

After the contents of the stomach were emptied, the stomach began to contract. This is a severe contraction, starting from the cardia and creeping in the direction of pylorus. This contraction makes people feel hungry; It's a sign that you should eat.

We know that there is always a certain amount of liquid and gas in the stomach at any time. The liquid is generally the digestive juice secreted by the gastric mucosa, and the amount will not be too much. Gas is usually swallowed with food when eating. In this way, when the stomach wall contracts sharply, these liquids and gases in the stomach will be squeezed and squeezed, just like when we wash clothes, if we rub in water with certain air, it will also make a sound of sucking.