*Source: https://www.years.co/en/demenz-durch-lebensstil-verhindern*

Where the evidence is strong and where it stops

# Can lifestyle really prevent dementia?
Reducing risk yes, preventing no. The difference lies between an estimate across a whole population and a statement about an individual — and that is exactly where this field most often promises too much.

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14

modifiable risk factors per the 2024 Lancet Commission

Stufe 4

claim level reached, not level 5

0

treatments changing the course after an incidental finding

The short answer

## Reducing risk yes, preventing no
The 2024 report of the Lancet Commission names 14 modifiable risk factors and estimates what share of dementia cases could arithmetically be avoided if they were eliminated across the whole population. That is a solid statement about a population — and it is regularly passed on as a promise to an individual, which it is not.

For early detection that means: on our claim ladder this area reaches level 4, not level 5. The missing piece is the study showing that a finding in someone without symptoms leads to a treatment that changes the course. That is why we say no here, although we say yes for cardiovascular disease and diabetes.

## Frequently asked questions
Can lifestyle really prevent dementia? + Reducing risk yes, preventing no — and the difference is not pedantry. The 2024 report of the Lancet Commission names 14 modifiable risk factors, among them high blood pressure, hearing loss, smoking, physical inactivity, diabetes and social isolation. The Commission estimates what share of dementia cases could arithmetically be avoided if those factors were eliminated across the whole population. That is a sound statement about a population. It permits no statement about whether a particular person prevents their dementia through particular measures. Addressing the factors is still worthwhile, not least because the same factors simultaneously lower cardiovascular risk.

My family has dementia — should I get tested? + That depends on what you expect from the result. Blood-based markers such as pTau217 measure reliably and are increasingly used in diagnosis in people with symptoms. For someone without symptoms the situation differs: an abnormal value currently triggers no treatment that demonstrably changes the course. It can be a considerable burden without anything following from it. That is precisely why this procedure sits at evidence tier 3 here and is documented rather than used to guide action. With a family cluster and early onset, genetic counselling may be the more sensible route, with proper information and the explicit right not to know a result.

So what actually helps? + The factors with the best data are unspectacular and overlap heavily with cardiovascular prevention: blood pressure in the target range, physical activity, not smoking, treating hearing loss, controlling glucose metabolism, social participation. That is the honest core. What that list does not contain is supplements, brain-training programmes with efficacy claims, or individual biomarkers from which a treatment could be derived. Anyone tracking these factors measurably lowers their cardiovascular risk and plausibly their dementia risk — with the difference that the former is evidenced in randomised trials.

Sources

- 14 modifiable risk factors for dementia, report of the standing Commission

Livingston et al., Lancet 2024

## Read on
The framework for this answer and the areas where it turns out differently.

What prevention can prevent

Four disease areas along the same five-level ladder.

Heart disease and early detection

Same yardstick, different result: here the answer is yes.

Our evidence classification

Why pTau217 and amyloid sit at tier 3 here.

Genetic analysis

Legal framework, counselling and the right not to know.

Incidental findings

What a finding without a consequence actually triggers.

Preventive medicine

The frame above all procedures: levels, statutory care, limits.

## Family history and unsure what makes sense?
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Medical Disclaimer

This information is provided for general education and is not a substitute for professional medical advice, diagnosis or treatment. Please discuss findings and individual medical decisions with a qualified physician. Content is reviewed periodically against the current state of scientific evidence.