Seven years after its last update, WHO said as much as 45% of dementia risk could be prevented or delayed by tackling modifiable factors, adding new advice to avoid air pollution from traffic and fireplaces.
The guidance backs a Mediterranean-style diet, exercise, cognitive stimulation, hearing aids for hearing loss, and social engagement, while urging lower tobacco, alcohol, obesity, diabetes and high blood pressure risks.
WHO strongly advised against using vitamin B or E, omega-3 and multivitamin supplements to prevent cognitive decline, and conditionally advised against menopausal hormone therapy for that purpose in women 65 and older.
More than 57 million people live with dementia worldwide and nearly 10 million new cases are diagnosed each year, with WHO and panel experts saying meaningful reductions will require government-led, population-wide action rather than individual effort alone.
WHO now links air pollution to dementia. Are our cities’ environmental policies failing to protect our cognitive health?
If supplements are useless for dementia prevention, why is research still exploring them for treating cognitive decline?
With dementia risks varying by sex and country, is a universal prevention strategy doomed to fail?
Dementia Prevention in 2026: The Expanding Role of Air Pollution and Modifiable Risk Factors
Overview
The World Health Organization's updated 2026 guidelines on dementia prevention turn the latest research on risk factors into clear, evidence-based recommendations. These guidelines aim to empower both individuals and healthcare systems to protect brain health by focusing on proactive management of health conditions like hypertension, diabetes, and high cholesterol. By effectively controlling these conditions, people can lower their risk of developing dementia. The guidelines highlight that early diagnosis and consistent treatment not only improve cardiovascular health but also help safeguard cognitive function over time.