Black Tea = Happy Heart

14 Mar

Black Tea Is Shown To Lower Blood Pressure


Western Australian tea drinkers are helping build evidence that black tea may aid in maintaining cardiovascular health — with local researchers showing three cups of black tea daily lowers blood pressure by 2 to 3mmHg.

Lead author Jonathon Hodgson from the University of Western Australia’s School of Medicine and Pharmacology says many studies have looked at black and green tea in relation to heart and vascular disease outcomes.

“Meta-analyses of these studies indicate that drinking more tea, compared to drinking less or no tea, is associated with about a 10 to 20 per cent lower risk of heart disease and stroke,” Prof Hodgson says.

Seeking to investigate if this association was causal, the team from UWA and researchers from Unilever, conducted the first human intervention study to look at black tea and blood pressure outcomes.

“There have been a number of human intervention studies looking at effects on vascular function, with reasonably consistent findings that tea can increase the relaxation of blood vessels — an outcome linked with blood pressure and risk of heart disease,” he says. “This was the first large study specifically designed and powered to look at blood pressure as the primary outcome.”

Ninety-five Australian participants aged between 35 and 75 were required to drink three cups of black tea or three cups of a placebo, with the same flavour and caffeine content as the tea, daily for six months. Using 24-hour blood pressure measurement taken at the end of the trial, the group found a reduction in the systolic and diastolic blood pressure of the tea-drinkers of between 2 and 3mmHg.


According to Prof Hodgson, while a reduction of 2 or 3mmHg is not large, it is still a valuable effect when combined with other interventions.

“If you put the effect of tea together with other dietary and lifestyle changes, such as weight loss or reduced salt and alcohol intake, you might get up to a 10mmHg reduction in blood pressure without drug therapy,” he says.

The group believe high flavonoid levels in black tea cause an increase in nitric oxide, a compound that acts on cells in blood vessel walls to cause relaxation, blood vessel dilation and, ultimately, a reduction in blood pressure. According to Prof Hodgson, the findings also show promise for those who prefer to not drink tea.

“You can get the same benefits if you eat enough of other flavonoid-rich foods such as apples, plums and red grapes — no tea required.”

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Quite a bit of research has been done over the years demonstrating the benefits of tea. So if the mood strikes you today, here is a handy dandy tea brewing chart. Drink tea and enjoy a happy heart ^_^

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3 Responses to “Black Tea = Happy Heart”

  1. Coral March 14, 2012 at 18:42 #

    1) Woot!

    2) What is “yellow tea”? Never heard of that!

  2. tearoomdelights March 19, 2012 at 08:38 #

    Hurrah for tea! If you combine it with eating dark chocolate, you’re practically on a health kick.

    • A. Theria March 20, 2012 at 00:21 #

      All the best things in life as delicious ^_^

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