Research: CHOI and COLLEAGUES,

Listed in Issue 173

Abstract

CHOI and COLLEAGUES,  Division of Rheumatology, Department of Medicine, Arthritis Research Centre of Canada, Vancouver General Hospital, University of British Columbia, Vancouver, Canada. hchoius@bu.edu researched the relationship between vitamin C intake and risk of gout.

Background

Several metabolic studies and a recent double-blind, placebo-controlled, randomized trial have shown that higher vitamin C intake significantly reduces serum uric acid levels. Yet the relation with risk of gout is unknown.

Methodology

We prospectively examined, from 1986 through 2006, the relation between vitamin C intake and risk of incident gout in 46 994 male participants with no history of gout at baseline. We used a supplementary questionnaire to ascertain the American College of Rheumatology criteria for gout. Vitamin C intake was assessed every 4 years through validated questionnaires.

Results

During the 20 years of follow-up, we documented 1317 confirmed incident cases of gout. Compared with men with vitamin C intake less than 250 mg/d, the multivariate relative risk (RR) of gout was 0.83 (95% confidence interval [CI], 0.71-0.97) for total vitamin C intake of 500 to 999 mg/d, 0.66 (0.52-0.86) for 1000 to 1499 mg/d, and 0.55 (0.38-0.80) for 1500 mg/d or greater (P < .001 for trend). The multivariate RR per 500-mg increase in total daily vitamin C intake was 0.83 (95% CI, 0.77-0.90). Compared with men who did not use supplemental vitamin C, the multivariate RR of gout was 0.66 (95% CI, 0.49-0.88) for supplemental vitamin C intake of 1000 to 1499 mg/d and 0.55 (0.36-0.86) for 1500 mg/d or greater (P < .001 for trend).

Conclusion

Higher vitamin C intake is independently associated with a lower risk of gout. Supplemental vitamin C intake may be beneficial in the prevention of gout.

References

Choi HK, Gao X and Curhan G. Vitamin C intake and the risk of gout in men: a prospective study. Archives of Internal Medicine. 169(5): 502-7. Mar 9 2009. Source: NLM. NIHMS147237 [Available on 03/09/10]   PMC2767211 [Available on 03/09/10].

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