There are other important components in tea that influence the stimulating and energizing effects of caffeine on the body, the most important of which are theanine and tea polyphenols. Theanine is a water-soluble free amino acid unique to tea, which can cross the blood-brain barrier and is useful for relieving stress and tension, relaxing the body and mind, improving cognitive ability, and improving sleep quality. And some studies have found that theanine can have an antagonistic effect on caffeine, which can partially counteract the increase in blood pressure caused by caffeine and reduce physical discomfort. What's more, other studies have found that theanine has a synergistic effect with caffeine, and that simultaneous intake has the effect of increasing attention span and improving agility and accuracy in behavioral tests. As a result, the body feels more awake and calm after drinking tea than it does after a cup of coffee.

Drinking tea will not be as exhilarating as drinking coffee Photo: 123rf.com.cn genuine image gallery

As for the tea polyphenols, under certain conditions, they will react with part of the coffee to make it exist in the form of a bound state, which will delay the absorption of caffeine and reduce the efficiency of the body's utilization of caffeine. There have been studies showing that the deep fermentation of Pu-erh ripe tea and the same microbial oxidation of some of the black tea, combined with the proportion of caffeine up to about 20%, while the proportion of unoxidized and fermented green tea combined with the proportion of caffeine is only & lt; 2%, the rest of the tea in the middle, which is to a certain extent, explains why some people think that the green tea refreshing and Pu-erh tea peace of mind.