Brain HealthWhite Matter Damage Drives Alzheimer's — Not Just a Side Effect
A major review in Ageing Research Reviews argues that white matter damage in the brain plays an active role in causing Alzheimer's disease, rather than being a passive byproduct. Using advanced imaging techniques like diffusion tensor imaging, researchers show that white matter deterioration often appears before memory loss or gray matter shrinkage — making it a potentially powerful early biomarker. The damage stems from multiple interacting causes including amyloid and tau protein buildup, inflammation, vascular problems, and cellular aging. Crucially, the review proposes that white matter breakdown can itself accelerate protein aggregation and neuroinflammation, creating a damaging feedback loop. This opens the door to new treatment strategies focused on protecting or regenerating myelin — the insulating sheath around nerve fibers — as a way to slow Alzheimer's progression.
