Tea Drinking — A Risk Factor for Urolithiasis?
A small increase in urinary oxalate concentration produces a considerable increase in supersaturation with respect to calcium oxalate1. Although dietary oxalate is responsible for only 10–15% of total urinary oxalate2, ingestion of oxalate-rich foods (e.g. rhubarb, spinach, chocolate) causes a marked increase in urinary oxalate excretion3. Tea, a major source of oxalate, is a popular beverage and, therefore, could be a clinically important risk factor for calcium oxalate urolithiasis. We have used a case control design to estimate this risk.
KeywordsOxalic Acid Calcium Oxalate Case Control Design Urinary Oxalate Calcium Oxalate Stone
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