Nervous system-have a cup of coffee, why come to the spirit?

Coffee contains a lot of caffeine (caffeine is a xanthine alkaloid, a central nervous system stimulant that temporarily repels drowsiness and restores energy). Caffeine stimulates the nervous system because it stimulates the nervous system. it binds to a receptor protein called adenosine A2A on the brain cell membrane, making it more sensitive and refreshing.

When drowsiness strikes, many people like to drink a cup of coffee to drive away drowsiness. But there are always some people who should still fall asleep even after drinking a few cups of coffee. why?

The explanation for why coffee is refreshing is that caffeine in coffee (caffeine content varies widely) stimulates the nervous system and makes it more sensitive. Researchers at the Osaka Institute of Life Sciences have further found that caffeine binds to a receptor protein called adenosine A2A on the brain cell membrane after people have drunk coffee or black tea. They studied mice and found that mice who drank more coffee slept significantly less than those who drank no or less coffee.

But British scientists don't think so. researchers at the University of East London conducted an experiment in which they recruited 88 volunteers who drank more than two cups of coffee a day and divided them into two groups. one group told them to drink decaf coffee, which was actually given them regular coffee, while the other group told them to drink regular coffee but served decaf coffee. Then both groups were asked to test their attention and response. if caffeine really increases attention and response, that is, it makes people feel more energetic, then the second group should do better than the first group, but the real result is just the opposite. the score of the first group is better than that of the second group. Scientists believe that what really works is not caffeine, but the psychological cues they get from coffee, that is, they think caffeine will make them feel better, whether it's real or not.

There are two very different conclusions in the study of caffeine. Some scientists have put forward a compromise explanation, that is, caffeine does reduce people's need for sleep, but it does not mean that it can improve people's efficiency at work, that is, attention and resilience. It is also right to think about it. After all, "awake" and "spirit" are two different concepts that can exist at the same time. Of course, if you like coffee very much, there is also some good news for you. Studies have shown that a variety of substances rich in coffee are good for immunity, which is not as good as ordinary drugs, but at least it can be regarded as a supplement. In addition, in a British study of more than 100 people, scientists found that coffee also helps to improve people's memory. Dr Michael Asa, of the University of California, Irvine, said: "We know that caffeine can enhance cognitive ability, but no research has shown that caffeine can improve memory. This study shows that caffeine can help slow forgetting within 24 hours. The similar images used in the study required subjects to have better memory and discrimination, which also highlighted the effect of caffeine on memory enhancement. "

As a beverage with a long history, numerous studies have shown that as long as it is not excessive, coffee is still a good drink, please rest assured to drink, if you drink it and then imply that "I will be very refreshed today", then it can also refresh you.

In short, coffee, tea, soft drinks and energy drinks basically contain caffeine, which can be refreshing. However, whether it is the role of caffeine, the role of the spirit, or both, its refreshing effect is very obvious. But be sure to pay attention to occasions when drinking, such as not suitable for drinking coffee before sleep or before sports competitions.

Author: Shan Shaojie