Tea consumption and the risk of depression: A meta-analysis of observational studies. (April 2015)

• Record Type: Journal Article
• Authors: Dong, Xiaoxin; Yang, Chen; Cao, Shiyi; Gan, Yong; Sun, Huilian; Gong, Yanhong; Yang, Huajie; Yin, Xiaoxu; Lu, Zuxun
• Is Part Of: Australian and New Zealand journal of psychiatry. Volume 49:Number 4(2015:Apr.)
• Page Start: 334
• Page End: 345
• Publication Date: 2015-04
• Subjects: depression -- depressive symptom -- meta-analysis -- tea consumption; Psychiatry -- Periodicals; Psychiatry -- Australia -- Periodicals; Psychiatry -- New Zealand -- Periodicals; 616.89005
• DOI: 10.1177/0004867414567759
• Languages: English
• ISSNs: 0004-8674

Abstract

Objective: Whether tea consumption decreases the risk of depression remains controversial. We performed a meta-analysis of findings from observational studies to evaluate the association between tea consumption and depression risk. Method: Embase, PubMed, and Chinese National Knowledge Infrastructure databases were searched from their inception through August 2014 for observational studies that had reported the association between tea consumption and depression risk. We used a fixed effects model when heterogeneity was negligible and a random effect model when heterogeneity was significant to calculate the summary relative risk estimates (RRs) and 95% confidence intervals (CIs). Results: Eleven studies with 13 reports were eligible for inclusion in the meta-analysis (22, 817 participants with 4, 743 cases of depression). Compared to individuals with lower tea consumption, those with higher tea consumption had a pooled RR of depression risk at 0.69 (95% CI: 0.63–0.75). Eight reports were included in the dose–response analysis of tea consumption and depression risk (10, 600 participants with 2, 107 cases). There was a linear association between tea consumption and the risk of depression, with an increment of 3 cups/day in tea consumption associated with a decrease in the risk of depression of 37% (RR = 0.63, 95% CI: 0.55–0.71). Conclusion: Tea consumption is associated with a decreased risk of depression.