Plasma n-3 fatty acids and the risk of cognitive decline in older adults: the Atherosclerosis Risk in Communities Study.
BACKGROUND
Plasma fatty acids may affect the risk of cognitive decline in older adults.


OBJECTIVE
We prospectively studied the association between plasma fatty acids and cognitive decline in adults aged 50-65 y at baseline and conducted a subgroup analysis.


METHODS
From 1987 through 1989, the Atherosclerosis Risk in Communities (ARIC) Study analyzed plasma fatty acids in cholesteryl esters and phospholipids in whites residing in Minneapolis, MN. From 1990 through 1992 and from 1996 through 1998, 3 neuropsychological tests in the domains of delayed word recall, psychomotor speed, and verbal fluency were administered. We selected cutoffs for statistically reliable cognitive decline in each of these domains and a measure of global cognitive change computed by principal-components analysis. Multivariate logistic regression was conducted. Focusing on n-3 highly unsaturated fatty acids (HUFAs), a subgroup analysis assessed differential association across potential effect modifiers implicated in oxidative stress and increased risk of neurodegenerative disease.


RESULTS
In the 2251 study subjects, the risk of global cognitive decline increased with elevated palmitic acid in both fractions and with high arachidonic acid and low linoleic acid in cholesteryl esters. Higher n-3 HUFAs reduced the risk of decline in verbal fluency, particularly in hypertensive and dyslipidemic subjects. No significant findings were shown for psychomotor speed or delayed word recall.


CONCLUSIONS
Promoting higher intakes of n-3 HUFAs in the diet of hypertensive and dyslipidemic persons may have substantial benefits in reducing their risk of cognitive decline in the area of verbal fluency. However, clinical trials are needed to confirm this finding.
Beydoun
May A
MA
Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. mbaydoun@jhsph.edu
Kaufman
Jay S
JS
Satia
Jessie A
JA
Rosamond
Wayne
W
Folsom
Aaron R
AR
D000368:Aged; D000375:Aging / Q000502:physiology / Q000523:psychology; D002788:Cholesterol Esters / Q000097:blood / Q000737:chemistry*; D003072:Cognition Disorders / Q000097:blood* / Q000453:epidemiology / Q000209:etiology; D015331:Cohort Studies; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage / Q000032:analysis / Q000097:blood*; D005260:Female; D006801:Humans; D006949:Hyperlipidemias / Q000150:complications / Q000178:diet therapy; D006973:Hypertension / Q000150:complications / Q000178:diet therapy; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology; D010743:Phospholipids / Q000097:blood / Q000737:chemistry*; D025341:Principal Component Analysis; D011446:Prospective Studies; D012307:Risk Factors
D002788:Cholesterol Esters; D015525:Fatty Acids, Omega-3; D010743:Phospholipids