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Dietary Salt, Urinary Calcium, and Kidney Stone Risk

Linda K. Massey Ph.D., R.D.,
DOI: http://dx.doi.org/10.1111/j.1753-4887.1995.tb01536.x 131-134 First published online: 1 May 1995


Both salt-loading studies and reports of free-living populations find that urinary calcium excretion increases approximately 1 mmol (40 mg) for each 100 mmol (2300 mg) increase in dietary sodium in normal adults. Renal calcium stone-formers with hypercalciuria appear to have greater proportional increases in urinary calcium (approximately 2 mmol) per 100 mmol increase in salt intake. Thus, reduction of dietary NaCl may be a useful strategy to decrease the risk of forming calcium-containing kidney stones.

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