Study Links Neighborhood Disadvantage to Brain Health Metrics

In a recent study involving nearly 3,000 brain MRI examinations, researchers found a significant association between residing in socioeconomically disadvantaged neighborhoods and deteriorating brain health indicators. The findings were published in Radiology.

John-Paul J. Yu, MD, PhD, an associate professor at the University of Wisconsin School of Medicine and Public Health, highlighted the study's implications, noting, "We’ve shown very robust, measurable metrics that our living environment has an outsized impact on the brain at the molecular and cellular level."

This retrospective analysis examined whether individuals living in the most disadvantaged neighborhoods showed higher brain age gaps and decreased total brain volume. The brain age gap reflects the difference between a person's actual age and their brain's apparent age as estimated from MRI data.

The researchers evaluated brain MRIs from 2,826 patients—1,094 men and 1,732 women—aged 18 to 96. The imaging data was collected from consecutive clinical MRI examinations at the University of Wisconsin Hospitals and Clinics from January to June 2024. Patients with imaging evidence of existing disease were excluded from the study. Volumetric measures were adjusted for intracranial volume and analyzed while controlling for age and sex.

Each participant's Area Deprivation Index (ADI) score was calculated based on their zip code, reflecting neighborhood-level socioeconomic deprivation. The ADI incorporates 17 socioeconomic indicators including income, education, employment, and housing characteristics based on the 2023 American Community Survey.

The results revealed individuals from the most disadvantaged neighborhoods exhibited higher brain age gaps and reduced total brain volumes. "We found that residents in the most disadvantaged neighborhoods had an accelerated brain age compared with people living in less deprived areas," Dr. Yu noted.

Furthermore, the study identified that these individuals had increased volumes of white matter hyperintensities, indicative of cardiovascular damage within the brain. Dr. Yu explained, "White matter hyperintensities are essentially the footprints of cardiovascular damage in the brain."

Increased volumes of these hyperintensities are linked to heightened risks of memory loss, cognitive decline, and dementia. Dr. Yu emphasized that the implications of this research extend beyond basic science, affecting public health and clinical practices by illustrating how environment influences neurological outcomes.

He concluded, "Neighborhood disadvantage, quantified by indices such as the ADI, is an important determinant... It’s important to factor in this data when planning health intervention programs and identifying areas needing improved access to care."

For further details, the full study titled "Evaluating the Effect of Neighborhood-level Disadvantage on Brain Health: An Imaging Epidemiology Study" can be accessed in Radiology.