Evidence supporting the use of: Fiber (unspecified)
For the health condition: Kidney Stones

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Dietary fiber is sometimes recommended as part of general lifestyle measures for the prevention of kidney stones, particularly calcium oxalate stones. The scientific basis for this recommendation is moderate and indirect. Fiber, especially insoluble fiber, can bind to calcium in the intestine, thereby reducing the absorption of calcium and oxalate—two key components in the most common type of kidney stone. Some observational studies have found that higher fiber intake is associated with a lower risk of kidney stone formation. However, randomized controlled trials specifically examining the effect of fiber supplementation on kidney stone incidence or recurrence are lacking, and the evidence is not robust enough to warrant fiber as a primary treatment strategy.

Most guidelines for kidney stone prevention emphasize increased fluid intake, moderation of animal protein, salt, and oxalate-rich foods, and adequate dietary calcium. Fiber is sometimes included as part of a healthy dietary pattern recommended for stone prevention, but it is not considered a standalone therapy. Overall, while fiber is beneficial for general health and may play a minor supportive role in reducing stone risk, the scientific evidence directly linking fiber supplementation to kidney stone prevention is limited. Thus, its use is best seen as part of a comprehensive dietary approach rather than a targeted treatment for kidney stones.

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