Abstract
Background
High protein intake leads to a decline in renal function in the advanced stages of chronic kidney disease (CKD). An effective diet for maintaining renal function in healthy individuals or patients in the early stages of CKD has not been established. This cohort study was conducted in Saku, Nagano Prefecture, Japan, to investigate the impact of dietary habits on renal function.
Methods
In this cross-sectional cohort study, we used the Saku Control Obesity Program (UMIN000016892), including 4,446 participants who submitted a brief-type self-administered diet history questionnaire and underwent routine physical examination. The amount of food intake was divided into quartiles. After adjusting for age and sex, multivariate logistic regression analysis was used to calculate the odds ratio (OR) for the risk of developing CKD (estimated glomerular filtration rate [eGFR] < 60 mL/min/1.73 m2).
Results
In total, 3,899 participants were analyzed. The overall prevalence of patients with eGFR < 60 mL/min/1.73 m2 was 11% (n = 434, male; 7.1%, female; 4.1%). The groups with a high intake of chicken (approximately 63.4 g/day, adjusted OR: 0.632, P = 0.003), natto (fermented bean; approximately 21.7 g/day, adjusted OR: 0.679, P = 0.01), and plant protein (approximately 0.8 g/ideal body weight/day, adjusted OR: 0.695, P = 0.042) showed a low risk of developing CKD compared to the group with the lowest intake.
Conclusions
Our cross-sectional study showed that the intake of chicken meat, natto, and plant protein was associated with high eGFR levels. This information can be of value for preventing CKD incidence in healthy Japanese individuals.
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Data availability
The data are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors thank all the participants for their dedication to this research project. We sincerely thank all researchers and co-medical staff of Saku Central Hospital for their excellent medical examinations and follow-up surveys. There is no conflict of interest in all the authors listed.
Funding
This study was partly supported by a fund from a Research-in-Aid Grant for Cardiovascular Diseases from the Ministry of Health, Labor and Welfare.
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Shaw Watanabe and Shu Wakino conceived the idea of the study. The authors wish to acknowledge AM, MI, and MY for valuable technical assistance. KA developed the statistical analysis plan and conducted the statistical analyses. HI contributed to the interpretation of the results. KA drafted the original manuscript. TK supervised the conduct of this study. All authors reviewed the manuscript draft and revised it critically on intellectual content. All authors approved the final version of the manuscript to be published.
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The study protocol was reviewed and approved by the ethics committee of Saku Central Hospital and adhered to the principles of the Declaration of Helsinki. Informed consent was obtained from all individual participants included in the study.
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Adachi, K., Yasuda, M., Ida, M. et al. Impact of dietary habits on renal function in Saku, a rural Japanese town: a cohort study. Clin Exp Nephrol (2024). https://doi.org/10.1007/s10157-024-02479-6
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DOI: https://doi.org/10.1007/s10157-024-02479-6