3 years ago

Fish intake, genetic predisposition to alzheimer's disease and decline in global cognition and memory in five cohorts of older persons.

Jean-François Dartigues, Cécilia Samieri, Philippe Amouyel, David A Bennett, Martha-Clare Morris, Daniel I Chasman, Claudine Berr, Francine Grodstein, Christophe Tzourio
Fish are a primary source of long-chain omega-3 fatty acids, which may help delay cognitive aging. We pooled participants from the French Three-City study and four US cohorts (Nurses' Health Study, Women's Health Study, Chicago Health and Aging Project and Rush Memory and Aging Project) with diet and cognitive data (n = 23,688 Caucasians aged ≥65 years, 88% female, baseline year range, 1992-1999, median follow-up range, 3.9-9.1 years) to investigate the relation of fish intake to cognitive decline and examine interactions with Alzheimer's disease-related genes. We estimated cohort-specific associations between fish and change in composite scores of global cognition and episodic memory using linear mixed models, and pooled results using inverse-variance weighted meta-analysis. In multivariate analyses, higher fish intake was associated with slower decline in both global cognition and memory (P-trend ≤ 0.031). Consuming ≥4 versus <1 fish serving/week was associated with 0.018 (95% CI: 0.004, 0.032) standard units lower rate of memory decline; an effect estimate equivalent to that found for 4 years of age. For global cognition, no comparisons of higher versus low fish intake reached statistical significance. In this meta-analysis, increasing fish intake was associated with decreasing memory decline. We found no evidence of effect modification by Alzheimer's disease genes.

Publisher URL: http://doi.org/10.1093/aje/kwx330

DOI: 10.1093/aje/kwx330

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