Green Tea Consumption and the Risk of Incident Dementia in Elderly Japanese: The Ohsaki Cohort 2006 Study

Yasutake Tomata, Kemmyo Sugiyama, Yu Kaiho, Kenji Honkura, Takashi Watanabe, Shu Zhang, Yumi Sugawara, Ichiro Tsuji

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Objective Biologic studies have shown that certain components of green tea may have protective effects on neurocognition. However, because of the lack of human epidemiologic studies, the impact of green tea consumption on the incidence of dementia has never been confirmed. The objective of this cohort study was to clarify the association between green tea consumption and incident dementia. Methods In this 5.7-year prospective cohort study, using a questionnaire, information on daily green tea consumption and other lifestyle factors was collected from elderly Japanese individuals aged 65 years or more. Data on incident dementia were retrieved from the public Long-term Care Insurance Database. Results Among 13,645 participants, the 5.7-year rate of incident dementia was 8.7%. More frequent green tea consumption was associated with a lower risk of incident dementia (hazard ratio for ≥5 cups/day versus <1 cup/day: 0.73; 95% confidence interval: 0.61–0.87). The lower risk of incident dementia was consistent even after selecting participants who did not have subjective memory complaints at the baseline. Conclusion Green tea consumption is significantly associated with a lower risk of incident dementia.

Original languageEnglish
Pages (from-to)881-889
Number of pages9
JournalAmerican Journal of Geriatric Psychiatry
Volume24
Issue number10
DOIs
Publication statusPublished - 2016 Oct 1

Keywords

  • Green tea
  • cohort study
  • dementia
  • elderly

ASJC Scopus subject areas

  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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