A recent study has revealed a concerning trend: individuals from lower-income backgrounds and racial minority groups face a higher risk of developing Alzheimer's disease and other forms of dementia. The research, published in the American Academy of Neurology's flagship medical journal, analyzed data from nationwide surveys and uncovered significant disparities in dementia risk factors among different socioeconomic groups.
The study found that lower income and racial minority status are strongly associated with a higher prevalence of dementia risk factors such as hearing loss, high blood pressure, depression, and physical inactivity. These risk factors are particularly prevalent among impoverished people and racial subgroups that have been historically underrepresented in clinical research, including Black and Hispanic Americans. The authors also noted that these groups tend to have more modifiable dementia risks, even in old age, making them ideal candidates for focused prevention efforts.
The research team, led by Dr. Eric Stulberg of Thomas Jefferson University Sidney Kimmel Medical College, analyzed data from 5,000 respondents, divided into six income groups. They found that higher incomes were associated with lower prevalence of most dementia risk factors, except for obesity, high cholesterol, and traumatic brain injury. Each step up in income category yielded a 9% lower likelihood of having an additional risk factor in middle age.
Racial disparities in dementia risk factors were also significant. Even after adjusting for income, risk factors such as diabetes, physical inactivity, obesity, and vision loss showed strong associations with Black Americans, Mexican Americans, and other racial subgroups when compared to White Americans. The study's findings suggest that low-income and minority patients are among the most likely to benefit from interventions, but also highlight the potential limitations of previous dementia research in these populations.
One of the study's most striking results is the potential impact of addressing two particular areas: vision loss and social isolation. The authors estimate that approximately 21% of dementia cases could be mitigated if vision loss were addressed, and 20% of cases linked to social isolation, both of which are considered late-life dementia risks and among the most easily preventable. However, the study also acknowledges its limitations, including the reliance on survey information reported by participants, which may not have been accurate.
The findings have sparked discussions among experts in the field. Dr. Jorge Llibre-Guerra, an assistant professor of neurology and Alzheimer's researcher at Washington University in St. Louis, praised the study for providing one of the clearest portraits to date of how income and race-ethnicity intersect to shape dementia risk across the U.S. He emphasized the importance of social and structural determinants in driving unequal dementia burdens and the need to target modifiable risk factors in lower-income and underrepresented communities.
Laura Samuel, an associate professor at the Johns Hopkins University School of Nursing, supported the study's findings, highlighting the disproportionate high levels of multiple dementia risk factors among Black, Hispanic, and low-income individuals across different stages of life. She emphasized the importance of addressing these risk factors early in life to prevent late-life dementia and the need for equitable educational opportunities to support public health strategies.
Despite some reservations about the statistical adjustments made in the study, Charles Marshall, a professor of clinical neurology at Queen Mary University of London, welcomed the findings. He stressed the importance of recognizing social determinants of health, such as race-ethnicity and socio-economic status, in the field of dementia research. Marshall advocated for addressing structural and societal factors to give everyone in society the best chance of living to old age with a healthy brain.
