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Article: The influence of dietary minerals on calcium oxalate kidney stones.(Nutritional Influences on Illness)
- Article from:
- Townsend Letter for Doctors and Patients
- Article date:
- October 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 The Townsend Letter Group. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Calcium
About 30 to 50% of patients with kidney stones have idiopathic hypercalciuria (excessive urinary calcium). Calcium restriction is usually not indicated, however, as:
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1. Chronic high calcium intake (up to 2 grams daily) in patients with normal vitamin D levels does not significantly increase urinary calcium, presumably because of a parathormone-mediated decrease in 1,25-dihydroxyvitamin D levels which, in turn, decreases the fraction of calcium absorbed. (1)
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2. Despite a low calcium diet, some hypercalciuric patients will continue to have high urinary calcium excretion ...