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Epidemiology

Association of dietary diversity with total mortality and major causes of mortality in the Japanese population: JPHC study

Abstract

Background/objectives

Eating a variety of foods has been recommended in the dietary guidelines of many developed nations, as well as global dietary guidelines. We investigated the potential effect of dietary diversity on the risk of total mortality and major causes of mortality in a large-scale cohort study involving the Japanese population.

Subjects/methods

From 1995 to 2012, 79,904 participants (37,240 men and 42,664 women) aged 45 to 74 years, without histories of ischemic heart disease, stroke, or cancer were followed-up for a median of 14.9 years. We used 133 food and beverage items listed on a 5-year follow-up food frequency questionnaire, and the daily frequency of consumption for each item (excluding five alcoholic beverages) was counted. Multivariable-adjusted Cox proportional hazards regression models were used to calculate hazard ratios (HRs) and corresponding 95% confidence intervals (CIs) to compare the highest and lowest quintiles.

Results

An inverse association was identified between total dietary diversity and mortality rates in women (highest quintile HR: 0.81; 95% CI: 0.71, 0.92; p for trend = 0.002) but the same trend was not observed in men (highest quintile HR: 0.96; 95% CI: 0.87, 1.10; p for trend = 0.266). In addition, fruit diversity was associated with lower mortality rates in men (highest quintile HR: 0.87; 95% CI: 0.79, 0.95; p for trend = 0.006), whereas soy diversity was associated with lower mortality rates in women (highest quintile HR: 0.89; 95% CI: 0.79, 1.00; p for trend = 0.004). With regard to men, meat and fish diversity were associated with higher mortality rates (highest quintiles of meat and fish diversity HR: 1.15 [95% CI: 1.06, 1.25] and 1.12 [95% CI: 1.02, 1.22], respectively).

Conclusions

These findings indicate that consuming a greater diversity of total foods and increasing the diversity of fruit and soy consumed have considerable public health implications.

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Acknowledgements

We thank the staff and participants involved in this work for their important contributions. This study was funded by the National Cancer Center Research and Development Fund (23-A-31 and 26-A-2) (since 2011), a grant-in-aid of cancer research from the Japanese Ministry of Health, Labour and Welfare (from 1989 to 2010), and a grant for a project study commissioned by the Japanese Ministry of Agriculture, Fishery, and Forestry (MAFF-CPS-2016-1-1). Editorial support in the form of medical writing was provided by Editage.

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Correspondence to Minatsu Kobayashi.

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Appendix

Appendix 1 The JPHC members are listed at the following site (as of February 2017): http://epi.ncc.go.jp/en/jphc/781/3838.html

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Kobayashi, M., Sasazuki, S., Shimazu, T. et al. Association of dietary diversity with total mortality and major causes of mortality in the Japanese population: JPHC study. Eur J Clin Nutr 74, 54–66 (2020). https://doi.org/10.1038/s41430-019-0416-y

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