What is the reason why drinking coffee is not refreshing?

Coffee has the same properties as theobromine in cocoa and theophylline in green tea, and the percentage reduction after roasting is extremely small. After caffeine enters the human body, it will affect the brain, heart, blood vessels, stomach and intestines, muscles and kidneys. An appropriate amount of caffeine will stimulate the cerebral cortex, promote sensory judgment, memory, and emotional activity, and make myocardial function more lively. Blood vessels dilate, blood circulation is enhanced, and metabolic function is improved. Of course, caffeine also helps to lose weight.

Caffeine can also reduce muscle fatigue and promote digestive juice secretion. In addition, because it promotes kidney function to expel excess sodium ions (chemicals that hinder the metabolism of water molecules) from the body, caffeine does not deposit in the body like other narcotic and excitatory substances (* products, paint solvents, stimulants, etc.), which is harmful to health.

Caffeine is excreted by the body in about two hours. In these two hours, the second hand will go very far, the minute hand will go around a very round circle, then you in front of the desk … What will happen? Drinking coffee is not refreshing, but people who want to sleep more and more are probably not. After careful analysis, there may be the following reasons why drinking coffee does not lift one's spirits:

Physical factors. You have a lot of powerful caffeine antibodies in your body, which resist the refreshing effect of caffeine.

You often drink coffee. Just like people who often drink alcohol will develop a strong resistance to alcohol, taking a drug for a long time will develop resistance, and you are resistant to caffeine.

There are substances that convert or resist caffeine in the food or drink you eat at the same time.

You are so sleepy that even coffee can't compete with your drowsiness.

Of course, most of those who can be awakened by coffee should enjoy it. Researchers at the University of Barcelona report that it takes only 10 minutes for coffee to work; it takes 45 minutes for caffeine to reach its maximum in the bloodstream, but it takes only a few minutes to reach half of it. The effects of caffeine range from two to three hours to as long as four or five hours, depending on everyone's sensitivity and metabolic rate to coffee.

Interestingly, even decaffeinated coffee can cheer the respondents up a hundred times. is this the magic of coffee? Or maybe it's because of our inner belief in it.