When the human body is tired, it will tell the brain through a signal substance called adenosine.
To let the brain know "I'm tired", it is necessary to dock this substance with a specific receptor in the brain. Caffeine in coffee can also bind to this receptor-and block the delivery of messengers, which is equivalent to blocking the normal binding of other receptors. In this way, the brain can't receive the signal of fatigue substances, so it won't feel tired.
However, the adenosine substances that make people feel tired have not decreased. Therefore, caffeine refreshing is just a lie about physical feelings.
Extended data refreshing drink
1, lemonade?
The intake of vitamin C and vitamin E in lemon reaches a balanced standard, which helps to strengthen memory and improve reaction flexibility. A glass of sour lemonade can not only eliminate drowsiness, but also help to improve eyesight and memory.
2, honey ginger tea
The spicy ingredients in ginger have the effect of sweating, thus warming the body and mind and helping to refresh. It is best to choose black tea as tea, because black tea is warm and can nourish the stomach and drive away the cold, and the honey is flat jujube honey.
References:
Popular Science China "Is drinking coffee really refreshing? 》