Green tea intake can significantly reduce both systolic and diastolic blood pressure.
In this meta-analysis, studies were sourced from the PubMed, Embase, and Cochrane Library databases from their inception to August 2019. The selection criteria focused on randomized placebo-controlled trials, exploring the effects of green tea on blood pressure control. The final selection consisted of twenty-four trials involving 1697 subjects, and the results were pooled using the generic inverse-variance method with random-effects weighting. The quality of the included studies was independently ascertained using the Jadad score, while potential publication bias was evaluated using funnel plots, and the Egger and Begg tests.
The pooled results showed that green tea intake led to notable reductions in both systolic and diastolic blood pressure, though the outcomes revealed significant heterogeneity among the trials. The funnel plots and tests used to investigate the publication bias did not find any substantial evidence to suggest this was an influencing factor in the results.
