Is green tea bad for your heart
Is Green Tea Really That Healthy?
Tea drinkers are more health-conscious
What is the "evidence"? On the one hand, that green tea drinkers live longer and are less likely to get cancer. But this can also have completely different reasons. It is known, for example, that tea drinkers are generally more health-conscious. This was the result of a French study years ago: tea drinkers smoke less and exercise more. And that alone can mean that the average tea drinker has a longer life expectancy than her beer and soda-drinking neighbor.
Neither laboratory studies nor clinical studies bring clarity
The fact that green tea is supposed to be so healthy is based on the other hand on studies of a substance that is mainly found in green tea, but rarely in black tea: It is EGCG (epigallocatechin gallate). Animal and laboratory studies show that EGCG - especially in a highly concentrated form - prevents certain vascular deposits that are responsible for Alzheimer's and Parkinson's. But it is still a long way from such laboratory tests to conclude that tea helps against Alzheimer's. The problem is that the EGCG is hardly absorbed by the body during normal tea drinking - so it cannot work.
Some of the positive effects (including the often read higher fat burning and the associated possible weight reduction) only come about when EGCG is taken in concentrated form - for example in the form of EGCG capsules. But it is precisely these that also harbor dangers for the liver.
And so it is often: In laboratory studies, the substances contained in tea show a certain property that is positive could - but in clinical studies, i.e. if you give tea to real patients, the effect is not there. There is one exception: cardiovascular diseases. Under certain circumstances, tea can widen blood vessels and thus reduce the risk of heart attacks. But in these attempts it didn't matter whether the tea was green or black.
Health-promoting effect with green and black tea
And this knowledge is increasingly gaining ground: almost everywhere where there is a health-promoting effect, it is equally evident in green and black tea.
This could indicate that research so far has bet on the wrong substance. It is possible that the catechins are not responsible for any positive effects at all, but for example theanine, an amino acid that occurs in both black and green tea. Or it is caffeine - the positive side of which is increasingly being discovered by research.
Don't expect too much
But these are all conjectures. At the moment one can only say: There are many good reasons to drink tea: it contains a lot of fluids, no calories and no alcohol. But if you only drink it to live longer, don't expect too much!
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