🔎 Recent Discoveries
Dementia research is advancing rapidly. This section covers the framework connecting all pathways, the scientists driving progress, global challenges, and the open controversies that honest science demands we engage with.
The Threshold Modelstrong evidence
Cognitive decline manifests when the burden of multiple interacting pathologies (amyloid, tau, vascular, TDP-43, alpha-synuclein, inflammation, metabolic dysfunction) exceeds an individual's cognitive reserve (built through education, bilingualism, s…
The Cascade Model
Rather than parallel pathways, the evidence supports an interconnected cascade: INITIATING EVENTS (genetics + environment, decades before symptoms) lead to EARLY PATHOLOGY (amyloid seeding, vascular damage, metabolic dysfunction, or chronic infection…
Why Different Treatments Work at Different Stages
Different interventions work at different stages:
Leading Scientists
The dementia research field is led by a remarkable group of scientists spanning genetics, immunology, clinical trials, and prevention.
Global Burden
Current: ~55 million people with dementia worldwide. 2050 projection: 139-152 million. Dementia is the 7th leading cause of death globally. Total economic cost: trillions of dollars annually (direct + informal care). Informal caregiving accounts for …
Racial & Ethnic Disparitiesstrong evidence
The "amyloid paradox": Black and Hispanic adults show LOWER amyloid levels on brain scans but HIGHER dementia rates \u2014 suggesting the disease may work differently in different populations. Current diagnostic tests were developed mainly using Whit…
Is Alzheimer's Even One Disease?strong evidence
At least 3-5 molecular subtypes of Alzheimer's have been identified. LATE mimics Alzheimer's but involves a completely different protein. Mixed pathologies are the norm in elderly. Precision medicine \u2014 matching treatments to the specific subtype…
Open Questions
Are anti-amyloid drugs worth the cost and risk? The benefit is real but small. Does the infection hypothesis hold up? The shingles vaccine data is compelling but needs more confirmation. Is the "45% preventable" number realistic? Probably not fully a…