Why do people know to eat when they are hungry? Which part of the body was "notified"?

People know that they are hungry and need to eat because they have received instructions from the brain, and the instructions from the brain are actually conveyed by the hypothalamus in the brain? Have you noticed? . Hypothalamus actually controls the endocrine system of human body. It can monitor the organs and endocrine system of the body in real time, and can judge whether the human body needs to eat by the content of blood sugar and fat.

Because the main energy sources of the human body are actually blood sugar and blood lipids, if the sugar content in the blood is kept at a low level for a certain period of time, then the liver of the human body will decompose liver sugar and make some glucose necessary for the human body. If the liver does this, the hypothalamus will send a message to the brain, and people will know that they are hungry and need to eat.

When people are full, it's actually the same, because if they eat too much, their stomachs will fall and swell because of food. The body will feel the stimulation of this pressure, and then the information received by the brain will be full. Moreover, in the process of food digestion, the contents of fat and glucose in the blood will also increase, so the hypothalamus will also get a signal that the energy in the body is enough now and there is no need to eat any more.

Therefore, whether people are full or hungry is actually the instruction of the brain, not the signal that there is no food in the stomach. Mainly according to the difference between blood sugar content and blood lipid content. So even if you don't eat food, you just need to drink a little sugar water, and you will feel full after your blood sugar rises. Although you don't eat any food, you will feel full.

So hunger is actually not a feeling in the stomach, but just an instruction from the brain. Therefore, if there is something wrong with people's hypothalamus, then people's perception ability will drop a lot, and there are likely to be some perceptual obstacles, so people will not feel hungry or full. So the brain is actually the real controller.