Country Level Incidence of Alzheimer Disease and Related Dementias is Associated with Increased Omega6 PUFA Consumption
Cieiselski, T.; tosto, g.; Durodoye, R.; RAJABLI, F.; Akinyemi, R.; Byrd, G.; Bush, W.; Kunkle, B.; Reitz, C.; Vance, J. M.; Pericak-Vance, M. A.; Williams, S.
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INTRODUCTIONClinical and genetic studies have implicated lipid dysfunction in Alzheimer Disease (AD) pathogenesis. However, lipid consumption at the individual-level does not vary greatly within most cohorts, and multiple lipids are rarely measured in any one study. METHODSMean country-level lipid intakes were compared to Age-Standardized Alzheimer-Disease-Incidence-Rates(ASAIR) in 183 countries across all inhabited continents. Penalized spline regression and multivariable-adjusted linear regression, including a lag between intake and incidence, were used to assess the relationships between five lipid intakes and ASAIR. Validation was conducted using longitudinal within-country changes between 1990 and 2019. RESULTSOmega6 Polyunsaturated-Fatty-Acid(PUFA) intake exhibited a positive linear relationship with ASAIR(multivariable-adjusted model: {beta}=2.44; 95%CI: 1.70, 3.19; p=1.38x10-9). ASAIR also increased with saturated-fat, trans-fat, and dietary-cholesterol up to a threshold. The association between Omega6-PUFA and ASAIR was confirmed using longitudinal intake changes. DISCUSSIONDecreasing Omega6-PUFA consumption on the country-level may have substantial benefits in reducing the country-level burden of AD.
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