Why is drinking coffee exciting? why is it refreshing after drinking coffee?

The caffeine in coffee can accelerate the metabolism of the human body, keep people clear-headed and sensitive, and make coffee have a "refreshing" effect. Caffeine stimulates the cerebral cortex, eliminates drowsiness, enhances touch and thinking, adjusts heart function, dilates kidney blood vessels, and is diuretic. Many people have the experience of being too excited to sleep after drinking coffee, because there is a conductive substance called adenosine in the body, which can control nerve activity. produce slow breathing, reduced mood, reduced gastric acid secretion and diuretic effects. On the other hand, caffeine will fake adenosine, making the body think that the effect of adenosine has taken place, making you feel energetic, increased stomach acid, urinate more frequently, and naturally less willing to fall asleep. It is worth noting that the brief awakening caused by this caffeine does not mean that physical strength is really restored. In addition, everyone has a different metabolic rate of caffeine, so their sensitivity to caffeine varies, so some people don't feel that their sleep is affected after drinking coffee. Therefore, a cup of hot coffee after getting up in the morning can exhilarate the body and mind and make the mood more comfortable, while it may cause insomnia at night.

Children under 12 are not allowed to drink coffee. Due to the incomplete development of children's liver and kidney and poor detoxification ability, the half-life of caffeine metabolism will be prolonged, so generally speaking, children under the age of 12 need to ban caffeine intake. Even people in Europe and the United States who drink coffee as boiled water all day have very strict restrictions on children's drinking coffee.