A recent study published in “Alzheimer’s & Dementia: Behavior & Socioeconomics of Aging” reveals a correlation between living in socially vulnerable and environmentally stressed neighbourhoods and the biological markers of Alzheimer’s disease. The research indicates that individuals in these areas face measurable risks linked to dementia.
The investigation, conducted by Wake Forest University School of Medicine, examined over 600 participants aged 54 and above, focusing on three composite measures: the Area Deprivation Index (ADI), Social Vulnerability Index (SVI), and Environmental Justice Index (EJI). These indices assess factors such as socioeconomic disadvantage, community disaster preparedness, and environmental burdens.
The study found that Black participants showed higher scores in all three indices compared to White participants, suggesting greater exposure to neighbourhood disadvantages. Among Black participants, high SVI and EJI scores correlated with increased variability in cerebral blood flow, while high ADI scores linked to decreased cerebral blood flow and cortical thickness. For White participants, a weaker association was observed between SVI scores and a particular Alzheimer’s biomarker.
The findings underscore the moderate influence of place-based social determinants on Alzheimer’s biomarkers, predominantly affecting Blacks or African Americans. This suggests differential impacts based on racial identities and experiences, potentially linked to structural racism. The study advocates for targeted interventions addressing these determinants to improve Alzheimer’s disease outcomes.
Future research should explore the long-term effects of exposure to these social determinants across life stages. Longitudinal studies are essential to comprehend how early and mid-life exposures influence later-life dementia biomarkers. Addressing structural inequalities and enhancing resource distribution in disadvantaged neighbourhoods remain critical to reducing Alzheimer’s risk and progression.
