Different types of dietary protein may have different effects on the risk of kidney stones. Earlier studies have found an association between high animal protein intake and an increased incidence of stone disease, at least in men, while vegetable protein intake has not been associated with stone risk. A new study suggests that the risk of stones may vary depending upon whether the source of the animal protein is dairy or nondairy. Higher nondairy animal protein intake was associated with a trend toward an increase in stone risk, whereas higher dairy protein intake in young women was associated with a lower risk of stone disease.
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