Key result
Green tea consumption lowers SBP and DBP by ~2 mmHg versus control.
Why the study?
Does green tea consumption reduce blood pressure?
Meta-Analysis (n=1,367)
Does green tea consumption reduce blood pressure?
Mean Difference: -1.98 (95% CI -2.94–-1.01)
p-value: p=<0.001
Green tea consumption is associated with a modest but statistically significant reduction in both systolic and diastolic blood pressure.
Supports adjunctive green tea for modest BP control; confirms pooled trial evidence in hypertension.
The studies investigating the effects of green tea on blood pressure (BP) have generated inconsistent results. The aim of this study is to quantitatively evaluate the effects of green tea on BP control. PubMed, Embase, and the Cochrane Library (updated to March 2014) were searched for randomized controlled trials evaluating the effects of green tea on BP. Pooled effect of green tea consumption on BP was evaluated using fixed-effects or random-effects model. Thirteen trials comprising a total of 1,367 subjects were included in the current meta-analysis. The overall outcome of the meta-analysis suggested that green tea consumption significantly decrease systolic blood pressure (SBP) level by -1.98 mmHg (95% CI: -2.94, -1.01 mmHg; P < 0.001). Compared with the control group, green tea also showed a significant lowering effect on diastolic blood pressure (DBP) in treatment group (-1.92 mmHg; 95% CI: -3.17, -0.68 mmHg; P = 0.002). Subgroup analyses further suggested that the positive effect of green tea polyphenols on BP was only showed in studies using a low-dose green tea polyphenol, with the long-term intervention duration or ruling out the confounding effects of caffeine. The meta-analysis suggested that green tea consumption had a favorable effect on decrease of BP.
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Peng et al. (2014) conducted a meta-analysis in Hypertension and Prehypertension (n=1,367). Green tea consumption vs. Placebo, water, or no tea was evaluated on Systolic blood pressure (SBP) (MD -1.98 mmHg, 95% CI -2.94 to -1.01, p=<0.001). Green tea consumption significantly decreased systolic blood pressure by 1.98 mmHg and diastolic blood pressure by 1.92 mmHg compared to control groups.
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