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Randomized Controlled Trial
. 2012 May;54 Suppl:S98-102.
doi: 10.1016/j.ypmed.2011.12.009. Epub 2011 Dec 16.

The Effect of Black Tea on Risk Factors of Cardiovascular Disease in a Normal Population

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Randomized Controlled Trial

The Effect of Black Tea on Risk Factors of Cardiovascular Disease in a Normal Population

Theeshan Bahorun et al. Prev Med. .

Abstract

Objectives: A prospective randomized controlled clinical trial determined the effect of Mauritian black tea consumption on fasting blood plasma levels of glucose, lipid profiles and antioxidant status in a normal population.

Methods: The study group (71%) consumed 3 x 200 ml of black tea infusate/day for 12 weeks without additives followed by a 3 week wash-out. The control group (29%) consumed equivalent volume of hot water for same intervention period.

Results: The tea used had high levels of gallic acid derivatives (50 ± 0.4 mg/L), flavan-3-ols (42 ± 2 mg/L), flavonols (32 ± 1 mg/L) and theaflavins (90 ± 1 mg/L). Daily 9 g supplementation of black tea infusate induced, in a normal population, a highly significant decrease of fasting serum glucose (18.4%; p<0.001) and triglyceride levels (35.8%; p<0.01), a significant decrease in LDL/HDL plasma cholesterol ratio (16.6%; p<0.05) and a non significant increase in HDL plasma cholesterol levels (20.3%), while a highly significant rise in plasma antioxidant propensity (FRAP: 418%; p<0.001) was noted .

Conclusion: Black tea consumed within a normal diet contributes to a decrease of independent cardiovascular risk factors and improves the overall antioxidant status in humans.

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