You can lower your dementia risk by acting on 14 modifiable factors that a major 2024 scientific review says account for nearly half of dementia cases worldwide. Dementia is a loss of memory, thinking, and reasoning severe enough to disrupt daily life, and while age and genes matter, these 14 factors are things you can influence. The 2024 Lancet Commission on dementia estimates that around 45% of dementia cases could theoretically be prevented or delayed by addressing these factors across a lifetime. That figure is a population-level model, not a personal guarantee, but it points clearly toward habits worth building now.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- The 14 factors on the list
- Which changes carry the strongest evidence?
- Where to start if you have several risk factors
- What the numbers do and do not mean
- A practical starting checklist
- Frequently Asked Questions
The 14 factors on the list
The Commission groups its 14 factors across life stages, from childhood through later years. Two were added in 2024: high LDL cholesterol in midlife and untreated vision loss.
Here is the full list, according to Alzheimer Europe's summary of the Commission: The two newest additions rest on large datasets. High LDL cholesterol was included after cohort studies of more than a million people plus a Mendelian analysis of 27 studies, and untreated vision loss was added from two large meta-analyses.
- Less education (early life)
- Hearing loss
- High LDL cholesterol
- Depression
- Traumatic brain injury
Which changes carry the strongest evidence?
Most of these 14 factors come from observational studies, which show association rather than proof of cause. The strongest interventional evidence comes from a controlled trial. The U.S.
POINTER study, published in JAMA in July 2025, followed 2,111 diverse older adults across five sites for two years. A structured program combining exercise, diet, cognitive and social engagement, and health monitoring improved global cognition more than a self-guided approach. Notably, the Alzheimer's Association reports that benefits held across age, sex, ethnicity, cardiovascular status, and APOE-e4 genotype — the gene variant that raises Alzheimer's risk. That consistency suggests the program can help a wide range of people, not just a narrow group.
Where to start if you have several risk factors
You do not need to fix everything at once. Blood pressure is a practical starting point with clear brain benefits. The National Institute on Aging reports that controlling high blood pressure may slow age-related brain damage and delay mild cognitive impairment, a common precursor to dementia.
Managing blood pressure also overlaps with diabetes, cholesterol, and heart health. The same NIA report describes a study where personalized health coaching for older adults with two or more risk factors — such as low activity, hypertension, diabetes, or smoking — produced modest two-year gains in cognition and better risk-factor control versus education alone. That points to a simple approach: pick the factors you already have, and get structured support to address them together.
What the numbers do and do not mean
The headline "45%" is easy to misread. It is a modeled estimate of what might happen across a whole population if these risk factors were eliminated — not the amount any one person can cut their own risk. The Commission itself flags important limits.
Much of the evidence is observational, and it warns of reverse causation, where early dementia changes behavior, and confounding, where a hidden factor drives both the risk factor and the disease. For example, physical inactivity may partly reflect very early brain decline rather than cause it. This does not make the advice useless. It means you should treat these factors as strongly supported opportunities that also improve heart, metabolic, and sensory health — while keeping realistic expectations about any single change.
A practical starting checklist
Use this short list to turn the research into next steps: For the full evidence behind each factor, the 2024 Lancet Commission report is the primary source.
- Get your blood pressure, LDL cholesterol, and blood sugar checked, and treat what is high.
- Ask about a hearing test if you strain to follow conversations; treat hearing and vision loss.
- Build regular physical activity and social contact into your week.
- Stop smoking and keep alcohol modest.
- Protect your head during sports, cycling, and falls.
Frequently Asked Questions
Does addressing these factors guarantee I won't get dementia?
No. Age and genetics still matter, and the ~45% figure is a population estimate, not a personal guarantee. These steps improve your odds, not certainty.
I'm already older — is it too late to benefit?
Evidence suggests not. The U.S. POINTER trial showed cognitive benefits in older adults, and blood pressure control can still help slow brain changes later in life.
Which factor should I tackle first?
If you have high blood pressure, start there — it has clear brain benefits and overlaps with diabetes, cholesterol, and heart health.
