WHO releases updated dementia prevention guidelines, adding air pollution and brain training

The World Health Organization (WHO) released updated guidance on dementia prevention, the first comprehensive revision since 2019. The new recommendations emphasize that up to 45 percent of dementia cases could be prevented or delayed by addressing modifiable risk factors such as smoking, alcohol consumption, physical inactivity, social isolation, high blood pressure, and exposure to air pollution.

"We know more today than ever before about what drives dementia risk, and these guidelines translate that knowledge into action," WHO Director-General Dr. Tedros Adhanom Ghebreyesus said in a statement.

The guidance adds air quality to the list of recognized risk factors, advising individuals to monitor air-quality alerts and limit exposure to heavy traffic pollution. It also expands recommendations for cognitive stimulation, encouraging activities that challenge the brain for both people with normal cognition and those with mild cognitive impairment.

"The biggest change is recognizing dementia prevention as a lifelong issue, not something that begins in old age," said Dr. Fawad Mian, a board-certified neurologist.

Social engagement is highlighted as a protective factor, with WHO urging participation in community activities, volunteering, and regular interaction with friends and family. Traditional lifestyle measures—regular physical activity, tobacco cessation, reduced alcohol intake, a healthy diet, blood-pressure control, diabetes and cholesterol management, and hearing health—remain central to the recommendations.

The agency advises against routine use of vitamin B, vitamin E, omega-3, and multivitamin supplements for dementia prevention unless a deficiency is diagnosed. WHO calls on governments to incorporate these evidence-based measures into public-health policies to curb the growing global burden of dementia, which currently affects more than 57 million people worldwide.