Associations Between Blood Nutritional Biomarkers and Cerebral Amyloid-: Insights From the COGFRAIL Cohort Study

Understanding the relationship between blood nutrients and neurodegeneration could contribute to devising strategies for preventing Alzheimer's disease. We investigated the associations between fatty acids, vitamins D, B6, B12, folate, homocysteine, and the cerebral load of amyloid beta (A beta). This cross-sectional study included 177 older adults (70-96 years, 65% female) with objective cognitive impairment, prefrail, or frail. Cerebral A beta load was determined using positron emission tomography Standardized Uptake Value ratios. Fatty acids were assessed in erythrocytes, vitamins D and homocysteine in serum, and the other vitamins in plasma. Linear regression models corrected for multiple comparisons evaluated the associations between each nutrient and A beta. The principal component factor followed by linear regression grouped the fatty acids strongly correlated (factor) and associated with A beta. Higher concentrations of polyunsaturated fatty acids (PUFAs): clupanodonic acid (22:5n-3; beta: -0.13; p = .001), mead acid (20:3n-9; beta: -0.07; p = .036), and adrenic acid (22:4n-6; beta: -0.05; p = .031) were associated with lower global A beta load, whereas linoleic acid (18:2n-6) was associated with higher global A beta load (beta: 0.18; p = .042). Clupanodonic acid was inversely associated with A beta in all cerebral regions except the thalamus. The factor composed of mead, clupanodonic, and arachidonic (20:4n-6) acids was associated with a lower global A beta load (beta: -0.02; p = .002). Some erythrocyte PUFAs were inversely associated with A beta load in the brain, and most of them were metabolites of the essential fatty acids linoleic and alpha-linolenic. Given the cross-sectional design, these results must be carefully interpreted, and longitudinal studies are needed.