Green tea: Beneficial effects on the cardiovascular system
Numerous studies have shown the beneficial effects of green tea on health. For example, it was found that the sum of plant substances contained in green tea has a protective effect on the cardiovascular system.
Green tea is becoming an increasingly popular beverage around the world, not least because of its pronounced health benefits. Green tea can reduce the risk of cardiovascular disease thanks to its ingredients. But it's not a miracle cure.
Reduced risk of high blood pressure
Green tea has long been known for its health benefits. Among other things, it has a positive effect on the cardiovascular system.
"The results of recent studies indicate that regular consumption of green tea reduces the risk of high blood pressure, stroke and heart attack," says Silke Raffeiner, nutrition expert at the South Tyrolean Consumer Centre, in a recent press release.
"This effect is due to the polyphenols contained in green tea, which are among the secondary plant substances."
Possible protection against cancer
Green tea may also protect against cancer. However, this has not yet been definitively proven, according to a meta-study that looked at around 140 individual studies.
Green tea contains epigallocatechin gallate (EGCG) from the tannin group. This substance can render aggressive oxygenated compounds, called free radicals, harmless. Since free radicals play a role in tumor development, it is believed that antioxidants such as EGCG may protect against cancer.
Tooth decay protection
On the other hand, the protective effect of green tea against tooth decay is well documented. Sodium fluoride is added to many toothpastes to prevent tooth decay and strengthen tooth enamel. Green tea naturally has a relatively high fluoride content, and the polyphenols in tea also kill carious bacteria and inhibit plaque formation.
Appreciated as a pick-me-up
Finally, green tea is also appreciated as a pick-me-up. Because the caffeine in tea is bound to tannins and is absorbed more slowly, the effect is delayed compared to coffee, but lasts longer.
The caffeine content depends on the type of tea used and how it is prepared. On average, a cup of green tea (250 milliliters) contains about 38 milligrams of caffeine.
In comparison, a cup of espresso coffee (25 to 30 milliliters) contains about 30 milligrams of caffeine and a cup of filter coffee (150 milliliters) contains 60 to 90 milligrams.
Consume with moderation
There are no official recommendations as to how much green tea you should drink to experience the positive effects. According to Professor Dr. Medical Hans Hauner, nutritionist and member of the Scientific Council of the Deutsche Herzstiftung eV applies to green tea like all other foods: to be consumed in moderation.
“I think one or two cups of green tea a day is a good guide. Approach green tea slowly and see how you tolerate it,” the expert recommends in a statement.
The caffeine it contains may have a stimulating effect on the cardiovascular system and may be associated with unpleasant symptoms such as palpitations, tremors, dizziness and restlessness.
If you must take cardiovascular medications or other medications, it is best to ask a doctor how much green tea is safe.
Organic and fair trade products
As the South Tyrol Consumer Advice Center explains, the optimal brewing temperature is 70-85°C, the recommended steeping time is two to four minutes. Tea leaves can be steeped up to three times.
Because conventionally grown green tea can be contaminated with pesticides and other residues, organic and fair trade green tea is the best choice.
However, the European Food Safety Authority EFSA advises against dietary supplements containing green tea extract. These would sometimes have very high levels of catechins, which could damage the liver. (ad)
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This text corresponds to the specifications of the specialized medical literature, medical guidelines and current studies and has been verified by health professionals.
This article contains general advice only and should not be used for self-diagnosis or treatment. It cannot substitute a visit to the doctor.