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Fatty acid intake and incident nephrolithiasis
Eric N Taylor1, Meir J Stampfer, Gary C Curhan
1Channing Laboratory and Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. entaylor@partners.org
Summary
Dietary fatty acid intake, including omega-3s like EPA and DHA, does not appear to influence kidney stone risk. This study found no consistent association between arachidonic acid, linoleic acid, or n-3 fatty acids and the development of kidney stones.
Area of Science:
- Nephrology
- Nutritional Science
- Epidemiology
Background:
- Elevated arachidonic acid may contribute to hypercalciuria and hyperoxaluria in kidney stones.
- n-3 fatty acids (EPA, DHA) might reduce cell membrane arachidonic acid and urinary calcium/oxalate.
- Increased EPA/DHA intake was hypothesized to lower kidney stone formation risk.
Purpose of the Study:
- To investigate the association between dietary fatty acid intake and incident symptomatic kidney stones.
- To determine if arachidonic acid, linoleic acid, or n-3 fatty acids affect kidney stone risk.
Main Methods:
- Prospective study of 3 large cohorts (N > 200,000) excluding prior kidney stone history.
- Fatty acid intake assessed via food-frequency questionnaires every 4 years.
- Cox proportional hazards regression used to adjust for risk factors.
Main Results:
- No association found between arachidonic acid or linoleic acid intake and kidney stone risk.
- A slight increase in stone risk was observed in older women with highest EPA/DHA intake, but not consistently across cohorts.
- Overall, fatty acid intake showed no significant link to kidney stone development.
Conclusions:
- Dietary fatty acid intake is not consistently associated with kidney stone development.
- Higher intake of arachidonic and linoleic acids does not increase kidney stone risk.
- Higher intake of n-3 fatty acids does not decrease kidney stone risk.