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Will Green Tea Raise My Blood Pressure?

Updated on November 4, 2007

If you are prescribed any kind of blood thinner, you are given a long list of foods containing Vitamin K to avoid. Vitamin K is a natural blood thinner. The thought is that any one of these foods can made your blood thinner, like Wafarin, work too well. You don't want to accidentally cut yourself and not have it stop bleeding. And, as you have probably guessed, green tea is on the list of no-nos for people taking blood thinning medication. Other foods include salads, spinach and garlic.

You Don't Need To Cut It Out Entirely

If you are taking blood thinners, you don't have to cut out green tea entirely. One or two cups of iced or hot green tea can still be enjoyed without any undue concern.

And if you don't take blood thinners, you now have another reason to indulge in a bottle of iced green tea or a box of green tea bags. Regular green tea is not only loaded with antitoxins, but helps keep your blood moving.

But if it does get your circulation moving, can green tea affect your blood pressure?

Well, It Depends...

The answer is going to be a lot longer than the question. Put the kettle on.

Green tea by itself will NOT raise your blood pressure, if you drink in moderate amounts, like one to three cups a day. However (and you knew a however was coming into this, didn't you?) green tea does contain caffeine, which can definitely raise your blood pressure if you overindulge in it. If you buy ready-made bottle of green iced tea, check the ingredients. They may have a lot of sugar or artificial sweeteners in it that can raise your blood pressure.

You can still drink iced green tea. Just make it yourself. That way, you can control the sweeteners and will know right away if you are using decaffeinated green tea or caffeinated green tea. Some people prefer the taste of caffeinated green tea while others can't detect any difference. Try to get the plain green tea bags or loose leaf if you're really into tea, and avoid heavily flavored green tea bags. Most green tea bags available in the United States are blended with natural and artificial sweeteners to make the taste more acceptable to what the average American palette is used to. Green tea is an acquired taste.

Be Sure To Brew It Properly

If you are worried about your caffeine intake, brew your green tea very lightly. The longer the tea brews, the stronger the taste (which in green tea can be very bitter) and the more caffeine is put into the tea. If you are making iced green tea, you don't really have to worry about brewing time, because your tea will be watered down.

But if you prefer your green tea hot (like I do), then your have to take some time learning how to properly brew green tea. Check the instructions on the box of tea - some will taste okay if you use boiling water, but most will not. And yes, it makes a BIG difference in the taste. You need to use hot water - water that's just about to come to the boil, but not actually boiled - in order to get the best flavor.

For more information on brewing green tea, click here.

Do you think this guy really loves green tea?


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  • profile image

    frank 9 years ago

    check you facts. Vitamin K is a fat-soluble vitamin that plays an important role in blood clotting. Without it blood would not clot. It reverses the effect of blood thinners.

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    Karin Greening 8 years ago

    when doing a search on Yahoo & seeing your link you have stated that vitamin K is a natural blood thinner!

    Nothing like putting a false statement on the Internet - vitamin K is the opposite - should a person's blood be too thin, not clot, they would get a shot of vitamin K.

    Guess your web site is not worth the time of day!

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    Organic Tea 8 years ago

    Yes. Caffeine constricts blood vessels, which leads to higher blood pressure. This is short term, and will go away as the caffeine is metablolized. As far as caffeine causing blood pressure to rise over the long term, that is still unclear. And as for the caffeine in coffee and tea somehow being not as bad for you as the caffeine in soda and energy drinks, that's b.s. Caffeine is caffeine no matter where it is found. In fact, much of the caffeine in soda and energy drinks is caffeine that has been extracted from coffee beans in the process or making decaf coffee, and is then sold to the soda makers. Of course, if you want caffeine, coffee and tea are much better sources than soda, since they contain other helpful molecules (antioxidants etc.), and aren't loaded with sugar

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    queen cleopatra 8 years ago

    i didn't know that green tea is a no-no beverage for hypertensive people. i abandoned coffee but retained drinking a cup of tea thrice a week. the infrequency is incidental because i tend to forget things these days. but thanks for this hub, i now knew that it is just ok to forget the tea once in a while. :)

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    cazort 7 years ago

    Here's an interesting study (even the summary is kinda dense reading) about green and black tea and blood pressure:

    The results are interesting; they did find that tea raises blood pressure somewhat, and does so slightly more than would be expected on the basis of caffeine content alone. However, the effects are short-lived, with no effects on ambulatory (long-term) blood pressure -- which is what matters most from a health perspective.

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    Heather 7 years ago

    Misinformation abounds in this article! First of all, don't post a warning about green tea causing HBP because of *artificial sweeteners and sugar* in bottled green tea. That's like telling someone not to eat eggs because you might crave bacon and bacon is bad for you. Just stick to the point please, and don't contribute to internet misinformation. Secondly, there is not a single study that supports the idea that green tea increases blood pressure, in fact, many indicate it can reduce blood pressure, and the more the better! Here is a study that indicates green-tea drinkers lower their risk of HPB by %50!!

    Likewise, your information about caffeine and blood pressure is also wrong. Many studies show coffee and tea have no effect on long-term blood pressure, and can even be beneficial. The only increase comes immediately after consumption, and even this often only occurs in non-regular tea drinkers.

    And Vitamin K-- it causes blood to CLOT. The reason doctors tell Wafarin users to restrict Vitamin K is because it can reduce the medication's effectiveness, not make it work "too well". Please check your facts, or delete this article.

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    HHHHBP 5 years ago

    just drink water man, no fooling around there.

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    messercola enrico 5 years ago

    acstractin one thu afect blood thinner

  • profile image

    Issac 5 years ago

    Seriously, just buy decaf green tea...

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