What is Alzheimer's disease?
Alzheimer's is a slow brain disease that gradually takes away memory, thinking, and eventually the ability to manage daily life. It's the most common cause of dementia. There's no cure yet, but risk can be lowered and progression sometimes slowed.
Alzheimer's disease is a slow, progressive brain disease marked by abnormal amyloid plaques and tau tangles, the loss of neurons, and shrinkage in the brain's memory regions. It accounts for about 60–70% of dementia. Early signs include trouble remembering recent events, misplacing things, searching for words, and changes in judgment or mood. Age, genetics (APOE4), cardiovascular risk factors, hearing loss, low education, and social isolation all raise risk. Today's medications (cholinesterase inhibitors, memantine, and newer anti-amyloid antibodies) modestly slow decline. Lifestyle — movement, food, sleep, social connection, blood pressure control — remains the most powerful lever for prevention.
The Lancet Commission (2024) identifies 14 modifiable risk factors that together account for ~45% of dementia risk.
Based on 2 sources — see references
What the studies found›
Anti-amyloid antibodies (lecanemab, donanemab) slow decline modestly in early disease.
Multidomain lifestyle programs (FINGER) improve cognition in at-risk older adults.
What does the research say?
Overall strength of the research behind this answer: Strong Human Research. The detail lives in the sections below — jump straight to the part you need.
Background: what it is and why it matters›
A neurodegenerative disease first described by Alois Alzheimer in 1906.
Diagnosis brings together clinical evaluation, cognitive testing, imaging, and — more and more — blood biomarkers.
About 7 million Americans live with Alzheimer's; that number is expected to double by 2050.
What we do about prevention today matters more than any single treatment.
Persian Perspective›
Persian medicine focused on keeping elders warm, nourished, engaged, and socially connected — practices modern dementia care increasingly supports.
Where tradition and science agree
- Persian tradition and modern neurology agree that the aging brain thrives on rhythm, connection, and purpose.
Where tradition and science differ›
- Modern medicine can now image amyloid and offer disease-modifying antibodies; tradition put its weight on caregiving and dignity.
How to use this information›
- Look after hearing, blood pressure, blood sugar, sleep, movement, and social connection — the levers with the strongest evidence behind them.
- Eat MIND-style: greens, berries, nuts, olive oil, fish, whole grains.
- Keep learning; stay part of your community.
One small step today: Book a hearing test if you are over 55 and have not had one this year.
Alzheimer's is a hard word. But most of what protects the brain is what makes a life good — movement, food, sleep, love, learning. Start there.
FAQs›
Is Alzheimer's genetic?
A small fraction runs strongly in families; most cases come from many genes plus environment.
Can it be prevented?
Not guaranteed — but risk can be lowered significantly.
Do the new drugs cure it?
No. They modestly slow early decline in selected patients.
Safety
- Anti-amyloid drugs carry real risks (brain swelling/bleeding) and require specialist care.
If a symptom is new, severe, or persistent — or you are pregnant, on medication, or managing a chronic condition — please speak with a qualified clinician who knows you. Read Safety First.
Full references (2)
- Livingston G et al. — Lancet Commission on dementia (Lancet, 2024)
- van Dyck CH et al. — Lecanemab in early Alzheimer's (NEJM, 2023)
Where evidence is uncertain, we say so. Trust grows through honesty.
About this article
- Evidence confidence
- Strong evidence
- Originally published
- July 6, 2026
- Last editorial review
- July 6, 2026
- Last scientific review
- July 6, 2026
- Next scheduled review
- July 6, 2027
- Purpose
- Educational only. Not medical advice.
- Governance
- How we review · Report a correction
Version history
- July 6, 2026Published in the Hakim Cornerstone Library.
- July 6, 2026Editorial review completed — clarity, structure, and internal links refreshed.
- July 6, 2026Scientific review completed — evidence and safety guidance verified.