A Nature Aging analysis by Migeot and colleagues examines how social and environmental exposures accumulated across the lifespan — the exposome — influence brain aging and dementia risk through identifiable biological pathways. The authors argue that current risk models, largely derived from high-income populations, miss context-specific drivers such as structural inequality, pollution burden and economic insecurity. They propose globally inclusive, context-sensitive measurement frameworks to guide equitable dementia prevention.
Key Points
- Lifetime social and environmental exposures shape dementia risk through biological pathways
- Dementia risk models derived from high-income populations underrepresent global exposure patterns
- Context-sensitive measurement frameworks proposed to guide equitable brain health prevention
Longevity Analysis
Brain aging trajectories are substantially determined by cumulative exposures — air quality, socioeconomic position, education, chronic stress — that precede clinical symptoms by decades, placing much of dementia risk outside the clinical encounter. For practitioners, this reframes cognitive risk assessment to include environmental and social exposure history alongside conventional vascular and metabolic markers. At the population level, dementia prevention strategies validated only in high-income cohorts may transfer poorly to the regions carrying the fastest-growing burden.
Original published by Nature Aging, by Joaquin Migeot.