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Evaluating the American Urologic Association (AUA) dietary recommendations for kidney stone management using the National Health And Nutritional Examination Survey (NHANES)

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Abstract

The objective of this study is to evaluate the conventional dietary recommendations for stone prevention among patients in the National Health and Nutritional Examination Survey (NHANES) and compare dietary components and special diets between stone formers and non-stone formers. We analyzed the NHANES 2011–2018 dietary and kidney condition questionnaires, among 16,939 respondents who were included in this analysis. Dietary variables were selected based on the American Urological Association (AUA) guideline for Medical Management of Kidney Stones and from other studies on kidney stone prevention. Weighted multivariate logistic regression models were used to assess the relationship of dietary food components (categorized into quartiles) and dietary recommendations with kidney stone formation (yes vs no), adjusted for total caloric intake, comorbidities, age, race/ethnicity, and sex. The prevalence of kidney stones was 9.9%. Our results showed association of kidney stones with lower levels of potassium (p for trend = 0.047), which was strongest for < 2000 mg (OR = 1.35; 95% CI 1.01–1.79). Higher vitamin C intake was inversely associated with stone formation (p for trend = 0.012), particularly at daily intake levels between 60 and 110 mg (OR = 0.76; 95% CI 0.60–0.95) and above 110mcg (OR = 0.80; 95% CI 0.66–0.97). There were no associations between other dietary components and kidney stone formation. Higher levels of dietary vitamin C and potassium intake may be indicated for stone prevention and warrants further investigation.

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Acknowledgements

Kevin Liu Kot and Kevin Labagnara contributed equally.

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The authors did not receive support from any organization for the submitted work.

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Contributions

All authors contributed to the study conception and design. Material, data collection and analysis were performed by Kevin Liu Kot and Kevin Labagnara. The first draft of the manuscript was written by Kevin Liu Kot and Kevin Labagnara and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. Conceptualization: KLK. Methodology: KLK, KL. Formal analysis and investigation: KLK, KL. Writing—original draft preparation: KLK, KL. Writing—review and editing: KLK, KL, JK, JL, KG, IA, AS. Supervision: IA, AS.

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Correspondence to Kevin Liu Kot.

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The authors have no relevant financial or non-financial interests to disclose.

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This research study was conducted retrospectively from data obtained by NHANES. This study was approved by the NHANES ethical review board.

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Liu Kot, K., Labagnara, K., Kim, J.I. et al. Evaluating the American Urologic Association (AUA) dietary recommendations for kidney stone management using the National Health And Nutritional Examination Survey (NHANES). Urolithiasis 51, 60 (2023). https://doi.org/10.1007/s00240-023-01423-9

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