Abstract
To the Editor: The high incidence of nephrolithiasis in Israel is a serious public-health problem. Many patients present with calcium stones in conjunction with hypercalciuria. There is a general awareness that higher water intake may help reduce the risk of renal colic. Furthermore, the major health-insurance agencies conduct radio and television campaigns to encourage higher water intake. One important point, however, has been underestimated: the content of calcium in the drinking water, which in some areas may be as high as 10 mg per deciliter. We describe three patients in whom nephrolithiasis and hypercalciuria were related to an intake of . . .

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