Abstract
Background/Objectives
To clarify the effects of intake of legumes and isoflavones on all-cause mortality in middle-aged and older Japanese.
Subject/Methods
The subjects were 2136 randomly chosen community-dwelling Japanese men and women aged 40–79 years who participated in a first-wave survey (1997–2000; baseline). The subjects were followed from baseline to December 31, 2017 (mean period of 16.6 ± 4.2 years). Intake of legumes, soybeans, and isoflavones at baseline was assessed using a 3-day dietary record with photographs. The relationships of intake amounts of legumes and isoflavones to mortality were assessed using Cox proportional hazards regression controlling for age, sex, education, employment, body mass index, smoking habits, medical histories, drinking, and energy intake.
Results
There were 491 deaths during the follow-up period. We found inverse associations of the intake of total soy products and intake of each of the isoflavones with all-cause mortality (p for trend < 0.05) in subjects aged < 60 years: the multivariate-adjusted hazard ratios (95% confidence intervals) for all-cause mortality in the highest intake group (third tertile) of total soy products and total isoflavones were 0.32 (0.13–0.78) and 0.35 (0.17–0.73), respectively, compared with the reference group (first tertile). In contrast, there were no significant associations of intake amounts of legumes, soybeans, and isoflavones with all-cause mortality in subjects aged 60 years or older.
Conclusions
The findings suggest that a higher intake of isoflavones might decrease the risk of all-cause mortality, especially in middle-aged Japanese.
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Acknowledgements
The authors wish to thank the study participants and their colleagues at NILS-LSA for their assistance with the survey in this study.
Funding
This work was supported in part by a grant from the Research Funding for Longevity Sciences of the National Center for Geriatrics and Gerontology, Japan (No. 19–10), and by grants from JSPS KAKENHI: JP15K16228 and JP20K05925. The funders/sponsors had no role in the design, conduct, or reporting of the study or in the decision to submit the manuscript for publication.
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All authors developed the idea for this study and approved the final version of the manuscript. RO, FA, and HS collected the data. RO, YN, and CT obtained the measurements and performed data analysis. FA and HS provided medical advice regarding interpretation of the data. MN drafted the manuscript with help of RO, FA, and HS.
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Nakamoto, M., Otsuka, R., Tange, C. et al. Intake of isoflavones reduces the risk of all-cause mortality in middle-aged Japanese. Eur J Clin Nutr 75, 1781–1791 (2021). https://doi.org/10.1038/s41430-021-00890-w
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DOI: https://doi.org/10.1038/s41430-021-00890-w
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