Abstract

Background: It is unclear whether habitual green tea consumption is related to comprehensive frailty. Objectives: We conducted this study to investigate this relationship among an elderly Japanese 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 questions on their green tea consumption. We evaluated comprehensive frailty 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 greater than or equal to seven. Results: We found that a higher consumption of green tea was associated with a lower prevalence of comprehensive frailty in both sexes. Further age-stratified analysis showed that a higher consumption of green tea among women was associated with a lower prevalence of comprehensive frailty, regardless of age. In men, however, this association was found only in the older age groups. An analysis of the association between green tea consumption and the frailty subdomains showed that green tea consumption was associated with a lower prevalence of oral dysfunction and cognitive problems in both sexes. In addition, only in women was higher green tea consumption found to be associated with a lower prevalence 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.

Highlights

  • Tea, one of the most commonly consumed beverages worldwide, has beneficial effects on human health [1]

  • The mean total Kihon Checklist (KCL) score was 5.0 for men and 5.1 for women, and the prevalence of KCL frailty risk was 29.3% in men and 30.6% in women, which were not statistically significant sex differences. The proportion of those with instrumental activities of daily living (IADL) and cognitive and memory problems was higher among men than among women, whereas the proportion of those with physical function/strength problems, malnutrition problems, or socialization and housebound problems was higher among women than among men

  • Age

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Summary

Introduction

One of the most commonly consumed beverages worldwide, has beneficial effects on human health [1]. Several epidemiological studies have reported the important role of dietary factors in preventing frailty [15,16] It is unclear whether habitual green tea consumption is related to comprehensive frailty. Further age-stratified analysis showed that a higher consumption of green tea among women was associated with a lower prevalence of comprehensive frailty, regardless of age. In men, this association was found only in the older age groups. Only in women was higher green tea consumption found to be associated with a lower prevalence of IADL and mobility-related disability problems.

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