Tea consumption is inversely associated with depressive symptoms in the elderly: A cross-sectional study in eastern China

Background: Epidemiological studies suggest that higher tea consumption was associated with lower risk of depressive symptoms, but this has not been found consistently. Moreover, the effect of different types of tea on depressive symptoms needs to be further explored. This study aimed to examine the association between tea consumption and depressive symptoms in Chinese elderly. Methods: We analyzed the baseline data from Zhejiang Major Public Health Surveillance Program including 9371 participants. Depressive symptoms was assessed through the application of Patient Health Questionnaire-9 scale (PHQ-9). Logistic regression models, controlled for an extensive range of potential confounders, were generated to evaluate the association between tea consumption and risk of depressive symptoms. Results: The black tea drinkers had a significantly decreased risk of depressive symptoms (p < 0.01), whereas no association was found in green tea drinkers. Compared with non-drinkers, the adjusted ORs (95% Cis) were 0.48 (0.23, 0.99) and 0.35 (0.17, 0.72) for participants consuming <3 cups and > 3 cups of black tea per day, respectively (P for trend: < 0.01). A linear association between concentration of black tea and depressive symptoms was also confirmed in our study. Limitations: Cross-sectional data could not make a causation conclusion, and the observed association in our study could not be ascribed to any specific component in tea. Conclusions: Our results indicated that higher black tea consumption was associated with a lower prevalence of depressive symptoms in the elderly. (C) 2016 Elsevier B.V. All rights reserved.