Dietary Long-Chain n-3 Fatty Acid Intake and Arthritis Risk in the Women’s Health Initiative

      Abstract

      Background

      The prevalence of arthritis in the United States is substantial and on the rise. Long-chain n-3 polyunsaturated fatty acids, which have anti-inflammatory properties, have been shown to provide therapeutic benefit to arthritis patients; however, to date few have examined these associations with arthritis risk.

      Objective

      The study objective was to examine the associations of long-chain n-3 polyunsaturated fatty acids intake with osteoarthritis (OA) and rheumatoid arthritis (RA) risk among postmenopausal women.

      Design

      This was a prospective cohort study.

      Participants

      The sample for this analysis consisted of 80,551 postmenopausal women, aged 55 to 79 years and with no history of arthritis, recruited into the Women’s Health Initiative Observational Study and Clinical Trials cohort between 1993 and 1998. Women completed a 120-item food frequency questionnaire at baseline.

      Main outcome measures

      After a median follow-up of 8 years, 22,306 incident OA and 3,348 RA cases were identified.

      Statistical analyses performed

      Adjusted Cox regression models were used to estimate hazard ratios and 95% CI for the associations between dietary LCn-3PUFA intake and OA and RA risk.

      Results

      Individual and total long-chain n-3 polyunsaturated fatty acids (Quintile 5 vs Quintile 1: hazard ratio 1.04, 95% CI 0.99 to 1.09 for OA; hazard ratio 1.01, 95% CI 0.90 to 1.13 for RA) were not associated with OA and RA risk. Further, no associations were observed between n-6 polyunsaturated fatty acids intake and either arthritis outcome.

      Conclusions

      This study is the first to examine associations of long-chain n-3 polyunsaturated fatty acids intake with OA risk and the largest to examine associations with RA risk. Despite their therapeutic potential, the study provides no evidence of benefit of these nutrients in relation to arthritis risk.

      Keywords

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      Biography

      J. L. Krok-Schoen is an assistant professor, James Comprehensive Cancer Center and School of Health and Rehabilitation Sciences, The Ohio State College of Medicine, The Ohio State University, Columbus.

      Biography

      T. M. Brasky is an assistant professor, James Comprehensive Cancer Center, The Ohio State University, Columbus.

      Biography

      M. B. Lustberg is an associate professor, James Comprehensive Cancer Center, The Ohio State University, Columbus.

      Biography

      R. P. Hunt is a statistical research associate Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA.

      Biography

      M. L. Neuhouser is a member and program head of the Cancer Prevention Program, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA.

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      T. E. Rohan is a professor and chair, Department of Epidemiology and Population Health, Albert Einstein College of Medicine, New York, NY.

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      T. A. Baker is a professor, Department of Psychology, University of Kansas, Lawrence.

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      W. Li is a professor, University of Massachusetts School of Medicine, Boston.

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      L. Carbone is chief, Division of Rheumatology, Medical College of Georgia at Augusta University, Augusta.

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      R. H. Mackey is an assistant professor, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA.

      Biography

      L. Snetselaar is a professor and chair, Preventive Nutrition Education, College of Public Health, The University of Iowa, Iowa City.