Popular science | does milk tea contain caffeine? How long will caffeine be metabolized in the body?

"Let's go for coffee at three o'clock in the afternoon." No, I'm afraid I can't sleep at night after drinking coffee. Let's go and have a cup of milk tea. In the afternoon, I wanted to have coffee and tea with my friends, but I was unexpectedly declined? The reason is that the caffeine in coffee interferes with sleep. But the behavior of girlfriends who can't sleep without coffee and milk tea is also confusing.

Caffeine is a naturally occurring stimulant found in more than 60 plants, including coffee beans, tea, cola nuts, (a plant used to flavor cola) and cocoa pods (used to make chocolate products). Of course, there is synthetic (artificial) caffeine, which is added to drugs, food and drinks. For example, some painkillers, cold medicines and over-the-counter drugs used to increase alertness all contain synthetic caffeine. Small snacks such as energy drinks and some chewing gum that are common on the market also add extra caffeine. The amount of caffeine in various foods and drinks varies, according to the National Institutes of Health:

A cup of coffee about 225 grams contains 95-200 milligrams of caffeine

A can of about 340 grams of cola contains 35-45 milligrams of caffeine

A can of about 225 grams of energy drink contains 70-100 milligrams of caffeine

A cup of about 225 grams of tea: 14-60 milligrams of caffeine

So milk tea actually contains caffeine, but it contains less caffeine than coffee drinks. It is well known that caffeine has many effects on the body: stimulating the central nervous system keeps people awake. Increase the release of gastric acid, excessive drinking will lead to stomach discomfort and so on. Worried about caffeine intake affecting sleep? Then we need to understand how caffeine works in the human body. According to BBC focus Science, the effects of caffeine are usually evident in about 10 minutes, but caffeine is not absorbed by the small intestine and distributed in all body tissues until about 45 minutes after intake. Peak blood concentration is reached within 1-2 hours. If you take the same dose of caffeine in the form of a tablet, the time to reach the blood peak often needs to be lengthened. For most people, the amount of caffeine in the body is halved about every 3-7 hours (depending on the person). This is what we often call the half-life of caffeine. 50% of the caffeine drunk at 3 p. M. is still circulating in the body before going to bed.

So how long will it take for caffeine to be fully metabolized? In fact, there is no standard answer. In 2019, Ananya Mandal, M.D., published an article pointing out that the duration of caffeine varies from person to person, depending on the amount of caffeine consumed and a number of personal factors, including age, weight, pregnancy, kidney health and individual sensitivity to caffeine. Caffeine is processed or metabolized in the liver by the cytochrome P450 oxidase system and decomposed into three metabolites dimethylxanthine: paraxanthine (84%), theophylline (12%) and theophylline (4%). These metabolites are then further broken down and excreted into the urine and finally metabolized. I believe that after reading this article, you will have a new understanding of your "coffee power". As for the best time to drink coffee (caffeinated drinks), you still need to explore for yourself. Photo Source: Internet

FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。

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