Animal proteins, including fish and eggs, contain purines that release uric acid, a large component of kidney stones. The risk of calcium stones also increases with excess consumption of animal proteins, because the breakdown of these foods causes a high excretion of calcium and low excretion of citrate (which neutralizes calcium). The Dietary Approaches to Stop Hypertension (DASH) diet emphasizes fruits and vegetables while limiting dairy and animal protein. It has been shown to reduce the risk of kidney stones.
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