Meta-Analysis of the Association between Tea Intake and the Risk of Cognitive DisordersReportar como inadecuado

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Alzheimer’s disease is a common neurodegenerative disorder in elderly. This study was aimed to systematically evaluate the association between tea intake and the risk of cognitive disorders by meta-analysis.

Methods and Findings

PubMed, Embase and Wanfang databases were systematically searched and a total of 26 observational studies were included in this study. Odds ratios ORs and the corresponding 95% confidence intervals CIs were calculated and pooled by using fixed or random effects models according to the degree of heterogeneity.


The overall pooled analysis indicated that tea intake could significantly reduce the risk of cognitive disorders OR = 0.65, 95%CI = 0.58–0.73. Subgroup analyses were conducted based on study design, population, frequency of tea drinking and type of cognitive disorders. The results showed that tea drinking was significantly associated with the reduced incidence of cognitive disorders in all of subgroups based on study design and frequency of tea drinking. In particular, tea drinking was inversely associated with the risk of cognitive impairment CoI, mild cognitive impairment MCI, cognitive decline and ungrouped cognitive disorders. Moreover, for population subgroups, the significant association was only found in Chinese people.


Our study suggests that daily tea drinking is associated with decreased risk of CoI, MCI and cognitive decline in the elderly. However, the association between tea intake and Alzheimer’s disease remains elusive.

Autor: Qing-Ping Ma, Chen Huang, Qiao-Yun Cui, Ding-Jun Yang, Kang Sun, Xuan Chen , Xing-Hui Li



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