WORLD NEWS
What WHO’s “45% of dementia risk” figure really means
WHO has issued its first full update in seven years on reducing dementia risk. The “up to 45%” figure is not an individual prevention rate; it is a population-level estimate of risk linked to modifiable factors.
What WHO means by 45%
WHO released the second edition of its dementia risk-reduction guideline on 15 July 2026. “Up to 45%” does not mean that every person can cut their dementia risk by exactly 45%. It is a population-level estimate of risk associated with modifiable factors such as tobacco, harmful alcohol use, physical inactivity, social isolation, air pollution, high blood pressure and diabetes. Age and genetics cannot always be changed, so a person can still develop dementia despite healthy habits.
What the guideline recommends and rejects
The guideline supports regular physical activity, stopping tobacco use, reducing alcohol consumption, a healthy diet, social engagement and cognitive activity. It also calls for clinical management of hypertension, diabetes and high cholesterol, and says hearing aids may form part of a risk-reduction strategy when appropriate. Reducing air-pollution exposure is a new recommendation. By contrast, WHO does not recommend vitamins B or E, omega-3 fatty acids, or multivitamin and mineral supplements for this purpose when no deficiency has been diagnosed.
Why this is not only an individual responsibility
Risk reduction cannot be reduced to personal willpower. Clean air, access to care, treatment for cardiovascular and metabolic conditions, hearing support, safe places to exercise and social connection depend partly on public policy and local conditions. WHO wrote the guideline for health professionals and policy-makers as well as individuals. More than 57 million people were living with dementia in 2021, and nearly 10 million people are newly diagnosed each year.
When memory changes are worrying
This is not a cure or a personal guarantee of prevention. No single food, supplement, test or exercise should be presented as a way to stop dementia. Repeated memory problems or difficulty carrying out familiar daily tasks should lead to professional assessment before online self-diagnosis or purchases marketed as prevention. Risk-reduction advice does not replace diagnosis and treatment when symptoms are present.
What to verify in WHO sources
WHO’s announcement explains the 45% figure and the headline recommendations. The full second-edition guideline, ISBN 978-92-4-012355-7, sets out the evidence and identifies areas where it remains insufficient. WHO’s dementia fact sheet provides the global burden and explains that dementia is a syndrome caused by several brain diseases. The next practical checkpoint is how national health authorities incorporate the guidance into local clinical and public-health policy.
WHO announcement and the meaning of 45%