Drinking coffee can also replenish water to the body.

But many people always remind themselves to drink no more than one cup of coffee a day, or not to drink coffee in the afternoon. Why is that? Because coffee can put pressure on the heart and can lead to diabetes and high blood pressure. Recently, some anti-caffeine groups have claimed that drinking coffee can lead to dehydration by increasing urination, because a very large number of people go to the bathroom after drinking coffee.

A British research team recently studied whether coffee causes dehydration and said the survey was the first of its kind among people who regularly drank coffee. The conclusion can be summed up in one word: no!

It should be noted that this paper, published in the international academic journal Public Library of Science (PLoS One), is not a sports study. In fact, the researchers also asked the 50 male subjects not to exercise, and they wanted to determine what effect coffee drinking had on people.

Because women are unable to control variables because of their physiological cycle, the subjects of this study do not include women. The 50 male subjects drank coffee for four days and did not drink coffee for four days. As part of the study, they drank four cups of 200ml (six to seven ounces) of coffee a day, while others drank four cups of 200ml of water a day. In other ways, they continued to drink normal liquids and foods determined by the three-day pre-experimental food diary. Of course, alcohol is forbidden.

Under the condition of no change in all the environment, the subjects were strictly tested for whole body water content, body weight, blood value, urine volume and renal function. The results of the study found that these indicators have not changed.

In other words, the human body does not drain valuable liquids out of the body because of the drinking of coffee. Coffee can replenish your body like water. The British team concluded: "these data show that when men who are used to caffeine drink coffee in moderation, coffee replenishes the body's daily fluid needs and does not adversely affect the body's fluid balance."

The results are consistent with the findings of the American Society of Sports Medicine (American College of Sports Medicine) on hydration in 2005. "although caffeine intake has a moderate diuretic effect on some individuals, it does not affect caffeine drinkers who habitually replace water intake with coffee, so athletes can eat caffeinated drinks on a daily basis, as long as they are not pure caffeine enthusiasts," the Institute of Sports Medicine wrote. "

This suggestion seems to contradict the daily perception that people go to the bathroom soon after a cup of coffee. The American Academy of Sports Medicine and other experts recommend that it is best to avoid drinking coffee directly after a lot of dehydration exercise. In this case, it is best to drink non-caffeinated drinks to replenish water, so that the body's water balance will return to normal more quickly in the short term.