The World Health Organization has published the second edition of its guideline on reducing the risk of cognitive decline and dementia, updating the 2019 recommendations with new evidence and a stronger life-course approach.
The technical guidance is intended for adults without dementia, including people with normal cognition or mild cognitive impairment. It does not promise that any single behaviour can prevent dementia in an individual.
The practical direction
WHO’s evidence base supports regular physical activity, avoiding tobacco, limiting harmful alcohol use, maintaining social and cognitive engagement and managing weight, blood pressure, cholesterol, blood sugar and depression. The updated guideline also considers air pollution and other environmental or structural conditions.
Multidomain programmes may combine several measures instead of prescribing one intervention. That reflects the fact that dementia risk is shaped by health, education, income, environment and access to care over many years.
Why equity matters
Advice is useful only when people can act on it. Safe places to exercise, affordable nutritious food, clean air, primary care and education are not evenly distributed. WHO therefore asks health systems and governments to address sociocultural and structural barriers rather than placing all responsibility on individuals.
Memory loss that disrupts daily life still requires clinical assessment. Treatable conditions—including medication effects, depression, thyroid disease and vitamin deficiencies—can sometimes resemble cognitive decline. The guideline is for population risk reduction, not self-diagnosis or a replacement for medical care.
Risk reduction is not a guarantee
The wording of the guideline is important. A population can lower avoidable risk without making dementia completely preventable. Age, inherited susceptibility and several neurological processes cannot be changed, while the effect of a modifiable factor varies between individuals. The recommendations are therefore best understood as ways to improve overall brain and cardiovascular health, not as a promise that following a checklist will stop every case.
That distinction also protects patients from exaggerated marketing. A single food, supplement, application or mental exercise should not be presented as a proven shield against dementia merely because it is associated with one component of healthy ageing. WHO instead takes a life-course and multidomain view, combining behaviours, clinical risk management, social conditions and environmental exposure.
What a health-system response can include
Primary care can connect dementia-risk work with services that already monitor blood pressure, diabetes, cholesterol, tobacco use, harmful alcohol use, hearing, mood and physical activity. Community programmes can support social participation and safer opportunities for exercise. Public policy also influences air quality, education, income security and access to nutritious food, which is why the guidance is directed at governments and service planners as well as individuals.
Programmes still need to be adapted to local circumstances. Advice that assumes safe streets, spare time, affordable food or continuous medical access may exclude the people facing the greatest risk. WHO’s emphasis on equity asks planners to examine those barriers instead of treating non-participation as personal failure.
When symptoms are already present
The document covers adults without dementia, including people with mild cognitive impairment. It does not replace assessment for someone experiencing persistent memory, language, judgement or daily-function changes. A clinician can review medicines, mood, sleep, sensory loss and other conditions that may contribute to symptoms and can decide whether specialist evaluation is appropriate. Early assessment is useful for care planning even when no reversible cause is found.
Sources: WHO risk-reduction guideline, second edition; WHO dementia fact sheet.
Screenshot of the official guideline page. Source: WHO.
