45% of Dementia Risk Could Be Prevented, WHO Says

The World Health Organization says up to 45% of dementia risk could be prevented or delayed by tackling modifiable risk factors across the life course. The updated guidance emphasizes that while there is no cure for dementia, early action can significantly reduce risk.

WHO says the main risk factors include tobacco use, harmful alcohol consumption, social isolation, physical inactivity, air pollution and noncommunicable diseases such as high blood pressure and diabetes. It also points to healthy diet, cognitive stimulation, social engagement and regular exercise as part of a broader prevention strategy.

The updated recommendations also include managing cardiometabolic conditions such as hypertension, diabetes and high cholesterol, along with supporting hearing health where appropriate. WHO says these measures are backed by current evidence and can help countries build stronger prevention plans.

The guidance aligns with recent global research showing that a large share of dementia cases may be linked to preventable factors. The Lancet Commission similarly concluded that around 45% of cases could be delayed or prevented by addressing a set of 14 modifiable risks, including vision loss and elevated LDL cholesterol.

A key message from the WHO is that prevention should not wait until old age. The agency stresses that risk reduction should begin early and continue throughout life, because education, healthy behavior and good chronic-disease management all shape brain health over time.

The guidance also warns against relying on supplements without a diagnosed deficiency. WHO says vitamins B and E, omega-3s and multivitamins have not shown enough benefit to recommend them for dementia prevention in people who do not need them medically.

The broader implication is that dementia prevention is not only a health-system issue but also a public-policy issue. Cleaner air, better primary care, stronger screening and more awareness about healthy aging can all reduce future burden.

For families and caregivers, the message is practical: regular activity, good blood pressure control, less smoking and drinking, and social engagement can make a real difference over time. WHO’s point is that brain health is shaped by everyday choices as well as by medical care.