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Original ArticlesNephrolithiasis
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DASH-Style Diet and 24-Hour Urine Composition

Eric N. Taylor, Meir J. Stampfer, David B. Mount and Gary C. Curhan
CJASN December 2010, 5 (12) 2315-2322; DOI: https://doi.org/10.2215/CJN.04420510
Eric N. Taylor
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Meir J. Stampfer
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David B. Mount
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Gary C. Curhan
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Abstract

Background and objectives: We previously observed associations between a Dietary Approaches to Stop Hypertension (DASH)-style diet and large reductions in kidney stone risk. This study examined associations between a DASH-style diet and 24-hour excretions of urinary lithogenic factors.

Design, setting, participants, & measurements: We studied 3426 participants with and without nephrolithiasis in the Health Professionals Follow-up Study (HPFS) and the Nurses' Health Studies (NHS) I and II. A dietary DASH score was based on seven components: high intake of fruits, vegetables, nuts and legumes, dairy products, and whole grains and low intake of sweetened beverages and red and processed meats. We used analysis of covariance to adjust for age, stone history, body size, and other factors.

Results: Comparing participants in the highest to lowest quintiles of DASH score, multivariate-adjusted urinary calcium excretion was 3% greater in HPFS (P trend 0.12), 10% greater in NHS I (P trend <0.01), and 12% greater in NHS II (P trend 0.05). Urinary oxalate was 4% to 18% greater (P trend all ≤0.03), urinary citrate was 11% to 16% greater (P trend all <0.01), and urinary volume was 16% to 32% greater (P trend all <0.001). Higher DASH score was associated with higher urine potassium, magnesium, phosphate, and pH, and lower relative supersaturations (RSS) of calcium oxalate (women only) and uric acid.

Conclusions: A DASH-style diet may reduce stone risk by increasing urinary citrate and volume. The small associations between higher DASH score and lower RSS suggest unidentified stone inhibitors in dairy products and/or plants.

Footnotes

    • Received May 20, 2010.
    • Accepted July 12, 2010.
    • Copyright © 2010 by the American Society of Nephrology
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    Clinical Journal of the American Society of Nephrology
    Vol. 5, Issue 12
    1 Dec 2010
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    DASH-Style Diet and 24-Hour Urine Composition
    Eric N. Taylor, Meir J. Stampfer, David B. Mount, Gary C. Curhan
    CJASN Dec 2010, 5 (12) 2315-2322; DOI: 10.2215/CJN.04420510

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    DASH-Style Diet and 24-Hour Urine Composition
    Eric N. Taylor, Meir J. Stampfer, David B. Mount, Gary C. Curhan
    CJASN Dec 2010, 5 (12) 2315-2322; DOI: 10.2215/CJN.04420510
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