Long-term lignan intake, whole grain foods, and the risk of gout: results from two prospective cohort studies.

Abstract

Objective: Multiple plant-based dietary patterns are inversely associated with gout, although the individual constituents driving this association remain unclear. Dietary lignans, a major group of phytoestrogens abundant in plant foods, are metabolized by the gut microflora and may modulate gout risk. We examined the associations between dietary lignan intake, certain whole grain foods rich in lignans, and incident gout.

Methods: We analyzed data from 122,680 individuals in the Health Professionals Follow-up Study and Nurses' Health Study. We administered a food frequency questionnaire every 2-4 years. We used Cox models to evaluate associations between dietary lignans, whole grain foods, and confirmed gout.

Results: Higher intakes of matairesinol (hazard ratio [HR] and 95% confidence interval [CI] comparing extreme quintiles: 0.78 [0.69, 0.90]; P trend=0.002) and secoisolariciresinol (0.78 [0.68, 0.89]; P trend=0.002) were both associated with lower gout risk, while pinoresinol and lariciresinol were not associated with gout. We found inverse associations of whole grain cold breakfast cereals (HR for those consuming ≥1 serving/day 0.62 [0.53, 0.73]), cooked oatmeal/oat bran (HR for those consuming ≥2 servings/week 0.78 [0.70, 0.86]), and bran added to food (HR for those consuming ≥2 servings/week 0.84 [0.74, 0.95]), but not dark breads or other cooked breakfast cereals, with gout.

Conclusion: Higher intakes of matairesinol and secoisolariciresinol, as well as whole grain cold breakfast cereals, oatmeal, and added bran, were each significantly associated with lower gout risk. These findings support adherence to healthful plant-based diets for gout and suggest a potential role of the gut microbiome in gout pathogenesis.