Could the neighborhood you live in impact your dementia risk? What studies are really saying
New research is drawing sharper links between dementia risk and where people live, from segregated census tracts to entire regions of the country. Here’s what the latest studies say about neighborhoods, brain aging and Alzheimer’s disease.
Can Your Neighborhood Really Affect Your Dementia Risk?
According to multiple recent studies, the neighborhood where you live may play a meaningful role in shaping long-term brain health.
A 2026 study published in Alzheimer’s & Dementia, the Journal of the Alzheimer’s Association, followed 119 adults over roughly 20 years and found that greater exposure to neighborhood segregation, particularly during midlife, was associated with higher levels of blood biomarkers linked to neurodegeneration later in life. Participants who experienced rising segregation over time showed elevated levels of glial fibrillary acidic protein (GFAP) and neurofilament light chain (NfL), which reflect brain stress and nerve cell injury. Researchers did not find a significant association between segregation and amyloid beta levels, suggesting the effects may work through inflammation and neuronal injury pathways rather than amyloid buildup. Because the study is observational, it cannot prove neighborhood segregation directly causes Alzheimer’s.
How Does Neighborhood Social Vulnerability Affect Alzheimer’s Risk?
Older adults living in neighborhoods with higher social vulnerability had roughly twice the odds of developing Alzheimer’s disease compared with those in the least socially vulnerable areas, according to a 2025 study.
Researchers analyzed data from 6,781 adults aged 65 and older enrolled in the Chicago Health and Aging Project, a long-running study of residents on the South Side of Chicago. Each participant was assigned a Social Vulnerability Index score based on their census tract, a measure developed by the CDC that captures socioeconomic status, household composition, disability, minority status and language, housing and transportation. Individuals in the most vulnerable neighborhoods experienced cognitive decline about 25% faster than those in the least vulnerable areas. The associations remained even after accounting for individual characteristics, suggesting community-level conditions may independently shape Alzheimer’s risk.
How Does the Region You Live in Impact Dementia Diagnosis Rates?
Diagnosis rates for Alzheimer’s disease and related dementias vary widely by region, ranging from about 1.7 to 5.4 new diagnoses per 100 older adults across U.S. healthcare areas.
A 2024 study in Alzheimer’s & Dementia found the South generally had higher recorded diagnosis rates, while parts of the West and Northeast had lower rates. Researchers stressed the differences may reflect healthcare access, specialist availability and screening practices rather than actual disease prevalence.
“Even within a group of people who are all 80, depending on where you live, you might be twice as likely to actually get a diagnosis,” said Julie Bynum, the study’s lead author and a geriatrician at the University of Michigan Medical School, per NPR. Erin Abner, a University of Kentucky epidemiologist not involved in the research, added, “Where we live is a powerful influence on our brain health.”
What Did the Duke Study Find About Disadvantaged Neighborhoods and Brain Aging?
People living in the most disadvantaged neighborhoods had a 43% higher risk of developing dementia than those in the least disadvantaged areas, according to a 2024 study led by researchers at Duke University and the University of Otago.
Published in Alzheimer’s & Dementia, the study analyzed national health and census data from more than 1.4 million people in New Zealand over 20 years, classifying neighborhoods by income, employment, education and access to resources. Researchers also drew on the Dunedin Study, which has followed nearly 1,000 people born in 1972 and 1973 from birth into adulthood. By age 45, participants who had spent more of their lives in disadvantaged neighborhoods already showed signs of accelerated brain aging, including differences in brain structure and poorer cognitive performance, decades before dementia typically appears. The associations held even after accounting for individual socioeconomic status.
Do Dementia Risk Factors Differ Across Regions and Countries?
Yes. A 2026 study in The Lancet Healthy Longevity analyzed harmonized data from 214,251 respondents aged 50 and older across 14 countries and found notable variation in dementia risk factors, along with some surprising similarities.
Low education was far more prevalent in many lower-income countries, at 85.6% in China compared with 12.0% in the U.S., while obesity was more common in higher-income countries, reaching 44.9% in the U.S. versus 13.3% in India. More than 50% of individuals in every country studied had at least two of the 12 established dementia risk factors, and similar clusters of cardiovascular, behavioral and social or sensory factors appeared across settings.
“I was less surprised by the differences and more surprised by some of the similarities, particularly in the ways these risks are patterned across settings,” said lead author Emma Nichols, a research scientist at the USC Schaeffer Institute for Public Policy & Government Service. “Risk for these late-life outcomes isn’t predetermined. These are risk factors you experience over the life course, and you can have an impact on changing your own risk.”
This article was created by content specialists using various tools, including AI.
