Green tea consumption and SARS-CoV-2 infection among staff of a referral hospital in Japan

  • Akiko Nanri
    Correspondence
    Corresponding author. Department of Food and Health Sciences, International College of Arts and Sciences, Fukuoka Women’s University, 1-1-1 Kasumigaoka, Higashi-ku, Fukuoka, 813-8529, Japan Tel.: +81 92-661-2411;
    Affiliations
    Department of Food and Health Sciences, International College of Arts and Sciences, Fukuoka Women’s University, 1-1-1 Kasumigaoka, Higashi-ku, Fukuoka, 813-8529, Japan

    Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
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  • Shohei Yamamoto
    Affiliations
    Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
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  • Maki Konishi
    Affiliations
    Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
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  • Norio Ohmagari
    Affiliations
    Disease Control and Prevention Center, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
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  • Tetsuya Mizoue
    Affiliations
    Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan
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Open AccessPublished:January 12, 2022DOI:https://doi.org/10.1016/j.nutos.2022.01.002
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      Summary

      Background & Aim

      This study examined the association between green tea consumption and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection among Japanese.

      Methods

      Participants were staff of a large referral hospital in Tokyo. Green tea consumption was ascertained via a questionnaire. SARS-CoV-2 infection was identified through in-house records of PCR-confirmed COVID-19 cases or antibody tests. Multiple logistic regression was used to estimate the odds ratio of SARS-CoV-2 infection according to green tea consumption.

      Results

      Of 2640 participants (767 men and 1873 women; aged 21-75 years), 74 (2.8%) were confirmed or suspected to have been infected with SARS-CoV-2 during the epidemic. Overall, SARS-CoV-2 infection was not significantly associated with green tea consumption. There was a suggestion of a decrease in the odds of this infection associated with green tea consumption of ≥4 cups/day (odds ratio 0.51, 95% confidence interval 0.20–1.31).

      Conclusions

      Green tea consumption was not appreciably associated with the risk of SARS-CoV-2 infection. A lower odds of infection among those who consumed high green tea consumption deserves further investigation.

      Keywords