Can you actually reduce your risk of Alzheimer's? What the evidence says
You can't guarantee you'll never get dementia — no product, drug or habit can promise that. But the honest, evidence-backed answer is yes, you can meaningfully influence your risk. The 2024 Lancet Commission estimates that around 45% of dementia cases are linked to 14 modifiable risk factors — things like blood pressure, hearing, activity, sleep and mental engagement. You can't change your age or your genes. You can know where you stand and act on the factors that are yours to move.
"Reduce your risk" is not "prevent" — and the difference matters
It's worth being precise, because the internet is full of products that quietly promise the impossible. Reducing risk means shifting the odds and, in some studies, delaying onset — not eliminating the possibility. Dementia has causes we don't fully control, including age and genetics. Anyone claiming to prevent or cure dementia is overstating what the science supports. What the evidence does support is that a stack of everyday factors, acted on consistently, is associated with lower risk. That's a real, worthwhile lever — just not a magic one.
What the big studies actually found
Four bodies of evidence anchor the case for risk reduction:
- The Lancet Commission (2024) concluded that ~45% of dementia cases are associated with 14 modifiable risk factors across life — from less education early on to hearing loss, high blood pressure, obesity, smoking, depression, physical inactivity, diabetes and social isolation later.
- The FINGER trial (2015) tested a two-year multidomain programme — diet, exercise, cognitive training and vascular monitoring together — and found it improved or maintained cognition in at-risk older adults compared with a control group. The signal was in combining levers, not relying on one.
- The ACTIVE trial followed older adults for a decade and linked speed-of-processing cognitive training to a lower risk of dementia — the strongest cognitive-training evidence to date.
- SPRINT-MIND (2019) found that intensive blood-pressure control significantly reduced the risk of mild cognitive impairment versus standard control — a reminder that what protects your heart tends to protect your brain.
None of these is a cure, and each has limits researchers openly discuss. But together they point the same direction: the brain's long-term trajectory is not fixed, and midlife habits are part of the story. Newer leads sit outside that established set — the most closely watched being the shingles vaccine and dementia risk, where several large studies have found that vaccinated people are diagnosed with dementia less often, though no completed trial has yet shown cause and effect. A second closely-watched lead has already been tested and settled the other way: GLP-1 drugs such as Ozempic looked strongly protective in health records, then showed no benefit at all when trialled in early Alzheimer's — a useful reminder of how far an observational signal can be from a result.
The factors you can actually change
Out of the Lancet Commission's list, the ones most within your control tend to cluster into a handful of levers:
- Your heart numbers — blood pressure, cholesterol, blood sugar and weight. Vascular health is one of the clearest links to brain health.
- Movement — regular physical activity is the single most consistently protective behaviour in the research.
- Hearing — one of the largest midlife risk factors, and one of the most treatable.
- Mental engagement — novel, challenging activity builds "cognitive reserve," the brain's buffer against decline.
- Sleep, mood and connection — deep sleep, treated depression and regular social contact each carry weight.
Why "know your number" beats generic advice
"Sleep well, exercise, eat vegetables" is true but useless — everyone already knows it, and nobody knows which lever matters most for them. The more useful move is to see where you actually stand across these factors, so you can put your effort where it counts and watch it change over time. That's the whole idea behind a personal risk profile.
See where you stand today — a free, three-minute brain-health risk profile that turns the list above into your personal priorities.
Get your free risk profileCan you prevent Alzheimer's disease?
No — nothing can guarantee prevention. But strong evidence links modifiable factors to lower risk and, in some studies, delayed onset. The accurate word is risk reduction, not prevention.
What percentage of dementia is preventable?
The 2024 Lancet Commission estimates around 45% of dementia cases are associated with 14 modifiable risk factors. That's a population estimate, not a personal guarantee — but it shows how much of the risk runs through things you can influence.
What's the single best thing I can do?
There isn't one — the evidence favours a stack. If you had to start somewhere, regular physical activity and getting your blood pressure and hearing checked are among the highest-value, best-supported moves.
Is it too late if I'm already in my 60s?
No. The changes behind dementia build over decades, so earlier is better — but studies suggest acting on modifiable factors can still help later in life. Speak with a qualified healthcare professional about your situation.
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This article is educational and is not medical advice, diagnosis, or treatment. Studies cited describe the interventions and risk factors in general, not Solenna specifically. Solenna does not prevent, treat, or cure Alzheimer's disease or any form of dementia; individual results vary and no outcome is guaranteed. If you are concerned about your cognitive health, consult a qualified healthcare professional.