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Does Green Tea Have Caffeine?

By Antonia Čirjak January 31 2020

A cup of green tea.
A cup of green tea.

Green tea is a well-known drink that comes from China and is a type of tea whose production differs from other teas. There are several different kinds of green tea; they vary based on the time of harvest, growing conditions, and several other factors. Often times, when discussing green tea, we mention the positive impact it can have on our health. This hasn’t been scientifically proven, however, so the health benefits are only mentioned in more informal publications. Green tea does contain caffeine, although in significantly smaller amounts than other caffeinated drinks.

Caffeine In Green Tea

Caffeine occurs naturally in fruits and leaves of a large number of plants, including those used to make tea. It stimulates the nervous system and boosts your alertness. People all over the world use caffeinated drinks as a cure for fatigue. It also has several health benefits such as increased brain function and a faster metabolism. However, it should be consumed in moderation.

One cup of green tea has around 35 mg of caffeine. However, this can differ depending on the assortment of the tea plant used. The caffeine in green tea is completely natural, so sometimes, a cup can have up to 50 mg of caffeine. If tea is made with older tea leaves, most of the time, it will have less caffeine than the one made with younger leaves. It is also worth noting that bagged teas usually have more caffeine than the tea you make from loose leaves.

Another thing influencing how much caffeine makes it into your cup of green tea is how long it is brewed. The longer you brew it, making the water hotter and hotter, the more caffeine your tea will have. Since green tea has less caffeine than most other drinks, it is entirely safe to consume a few cups of it daily. However, if people are overly sensitive to caffeine, they should be more careful and consult their doctor to be safe.

Origins Of Green Tea

The origins of tea production and consumption can be traced back to ancient China. Most commonly, it is believed that the tradition of drinking tea has originated during the time of the Shang Dynasty in the Yunnan region of China. It was most likely used as a medicine. The first credible source mentioning tea drinking dates back to the 3rd century, and it is a text dealing with the medical benefits of drinking tea. Another important book from 1211 called “The Book of Tea,” written by a priest named Eisai, notes how green tea can have positive effects on the body. 

The entire history of tea is hugely complex and spans many centuries, but certain vital moments should be noted. Tea arrived in Japan in the 6th century, and following that began its expansion all over eastern Asia. During the 16th century, Portuguese priests were introduced to tea. In the 17th century, tea started to become more and more popular in Britain. The British were responsible for introducing tea production and consumption to India. 

Health Effects Of Green Tea

Many articles are dealing with the health benefits of green tea; however, there is no scientific evidence of this. Still, there is enough reason for people to believe that drinking green tea can improve your health, even by a little bit. Green tea has very little calories, only 1 per 100 mL. It can have a positive effect that usual caffeinated drinks have, enhancing our mental alertness. There is some evidence that green tea can affect the risk of cancer and other cardiovascular diseases, however.

Some studies have uncovered that drinking green tea daily can lower the risk of developing cardiovascular diseases. It can also lower the risk of a stroke and decrease the total cholesterol in the blood. However, we should be careful when consuming green tea in excessive amounts. One should drink it in moderate amounts because it can cause liver toxicity in some people when consumed in large quantities.

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