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Plasma folate concentration and cognitive performance: Rotterdam Scan Study - Source: The American Journal of Clinical Nutrition, Sep 2007

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By LM de Lau, et al. • www.ProHealth.com • September 21, 2007


Background: Evidence is increasing for beneficial and independent effects of folate on cognitive function, but the underlying biologic mechanism is as yet unknown. [Folate, from the Latin “folium” for leaf, is a water-soluble B vitamin that helps produce and maintain new cells.]

Objective: We examined the independent association of plasma folate concentration with cognitive performance and explored the nature of this association by evaluating brain-imaging markers for cerebrovascular disease and brain cell loss.

Design: In the population-based Rotterdam Scan Study, 1033 nondemented participants aged 60-90 years underwent extensive cognitive testing and brain imaging. We cross-sectionally examined the association between plasma folate concentration and cognitive test performance by multivariate linear regression. To evaluate the role of vascular or other mechanisms in this association, we subsequently studied whether plasma folate was related to the presence of white matter lesions and hippocampal and amygdalar volumes.

Results: After multivariate adjustment, the mean change in test score per 1-SD increase in plasma folate was 0.05 (95% CI: 0.01, 0.09) for global cognitive function, 0.08 (95% CI: 0.04, 0.13) for psychomotor speed, and 0.02 (95% CI: -0.04, 0.07) for memory function.

Adjustment for homocysteine concentration only slightly diminished these associations. [Folic acid and other B vitamins help break down homocysteine, an amino acid that at elevated levels in the blood is associated with increased risk of atherosclerosis.]

The odds ratio relating a 1-SD increase in plasma folate to the presence compared with the absence of severe white matter lesions was 0.79 (95% CI: 0.66, 0.94), whereas no relation was seen between folate status and hippocampal or amygdalar volume.

Conclusions: Higher plasma folate concentrations are associated with better global cognitive function and better performance on tests of psychomotor speed, regardless of homocysteine concentration. These associations may be mediated by vascular mechanisms.

Source: The American Journal of Clinical Nutrition. 2007 Sep;86(3):728-34. PMID: 17823439, by de Lau LM, Refsum H, Smith AD, Johnston C, Breteler MM. Departments of Epidemiology and Biostatistics and Neurology, Erasmus Medical Center, Rotterdam, Netherlands; Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, UK.





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