Association Between Habitual Green Tea Consumption and Comprehensive Frailty Risk Assessed by Kihon Checklist Indexes Among Japanese Elderly Population
Abstract Background: It is unclear whether habitual green tea consumption is related to comprehensive frailty. Objective: We conducted this study to investigate this relationship among a Japanese elderly population.Methods: This was a cross-sectional study of baseline data from 2012. The study included 5668 Japanese participants (2766 men and 2902 women, aged 65 years or older). The subjects completed a validated self-administered food frequency questionnaire that included green tea consumption. We evaluated comprehensive frailty by using a 25-item Kihon Checklist (KCL), which comprised seven domains (instrumental activities of daily living [IADL], physical function, malnutrition, oral or eating function, socialization and housebound, cognitive function, and depression). Frailty was defined as a KCL score ≥7. Results: We found that higher consumption of green tea was associated with a lower risk of frailty in both sexes. Further age-stratified analysis showed that higher consumption of green tea among women was associated with a lower risk of frailty, regardless of age. In men, however, these associations were found only in the older age groups. An analysis of the association between green tea consumption and frailty subdomains showed that green tea consumption was associated with a lower risk of oral dysfunction and cognitive problem in both sexes. In addition, only in women, higher green tea consumption was inversely associated with a lower risk of IADL and mobility-related disability problems.Conclusions: Green tea consumption is inversely associated with the prevalence of comprehensive frailty in Japanese men and women. Longitudinal studies are required to confirm this association.