Nearly Half of Dementia Cases Could Be Prevented, but Current Public Health Campaigns Miss the Mark

Two Curtin University studies, published in *The Lancet Healthy Longevity* and *Clinical Nutrition*, estimate that up to 45 % of dementia cases stem from modifiable lifestyle and environmental factors. A review of campaigns in eight countries found awareness efforts produce only modest knowledge gains and limited behaviour change. A parallel cohort of ~500 000 adults linked sarcopenic obesity to a 30 % higher dementia risk, while obesity alone was not a risk when muscle strength was preserved.

PharmaphorumAlmost half of dementia cases could be prevented – but change is neededAlmost Half of Dementia Cases Could Be Prevented

Risk factors identified include physical inactivity, smoking, low education, social isolation, hypertension, diabetes and poor diet. The cohort analysis showed sarcopenic obesity—low muscle strength with excess fat—raised dementia risk by 30 %, whereas obesity without muscle loss showed no association. Modeling suggests that personalised risk profiling could improve modifiable-risk status by 26 % over three years.

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With ageing populations driving rising dementia prevalence, preventing half of cases could substantially reduce future health-care burdens. Dementia is expected to become increasingly common as populations age, so even modest reductions could alleviate pressure on health systems.

Almost Half of Dementia Cases Could Be Prevented

Professor Mario Siervo noted that awareness alone seldom yields lasting behaviour change and advocated for personalised risk assessments delivered through trusted community networks. Professor Blossom Stephan warned that the belief dementia is inevitable, combined with time, cost and motivation barriers, hampers preventive action.

Nearly Half of Dementia Cases Could Be Prevented Through Lifestyle Changes

The review highlighted a persistent knowledge-action gap, finding passive information dissemination ineffective. Interactive, culturally tailored programmes led by local health workers or peer educators consistently outperformed mass-media approaches.

Almost half of dementia cases could be prevented – but change is needed

Modelled 26 % risk-factor improvement lacks long-term empirical validation; further studies are needed across diverse settings.

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• “Up to 45 per cent of dementia cases are linked to modifiable factors we can change, such as our lifestyle, health status and environment,” — Professor Mario Siervo, Curtin University

Almost half of dementia cases could be prevented – but change is needed

• “But simply telling people what those risks are isn’t enough; awareness campaigns are important, but on their own they rarely lead to meaningful or lasting behaviour change.” — Professor Mario Siervo

Almost half of dementia cases could be prevented – but change is needed

• “There is still a widespread belief that dementia is an unavoidable part of ageing, which is not the case,” — Professor Blossom Stephan, Curtin University

Almost half of dementia cases could be prevented – but change is needed

• “But even when people are aware of the risks, barriers such as time, cost and motivation can prevent them from making changes to their lifestyle.” — Professor Blossom Stephan

Almost half of dementia cases could be prevented – but change is needed

The authors call for online education that guides step-by-step brain-health actions, personalised risk assessments, and community-based programmes led by trusted local figures. Programs must be accessible, culturally relevant, and co-designed with target communities to translate knowledge into sustained preventive behaviour.

Almost half of dementia cases could be prevented – but change is needed