Up to 45% of dementia risk can be prevented or delayed — WHO

The World Health Organization (WHO) released updated international guidelines on 15 July 2026, announcing that up to 45 percent of dementia risk can be prevented or delayed through the management of specific lifestyle and environmental factors. This update represents a significant expansion from the organization's initial 2019 recommendations, reflecting a growing scientific consensus on how human behavior and public health policy can influence cognitive longevity. The revised figures, which rose from a previously estimated 40 percent, stem from the identification of 14 modifiable risk factors, two more than were recognized in earlier reports.

Dementia, which is currently the seventh leading cause of death worldwide, impacts more than 57 million people, with nearly 10 million new diagnoses occurring every year. While there is no known cure for the condition — the most common form of which is Alzheimer’s disease, accounting for 60 to 70 percent of cases — the WHO stated that the prevalence of the disease is not an inevitable consequence of aging. According to global reports, the economic burden of dementia is estimated at $1.3 trillion annually, with half of that cost comprised of unpaid labor provided by families and friends, highlighting the urgent need for systemic intervention.

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Modifiable Risk Factors

The updated guidelines identify specific factors that contribute to the risk of cognitive decline. These factors span the human life course, from early life to late life, and include a mix of medical, social, and environmental exposures.

• Medical Conditions: Effective management of hypertension, diabetes, and high cholesterol is essential. The guidelines also identify hearing loss and vision loss as key areas for clinical intervention, noting that the use of hearing aids can serve as a risk-reduction strategy.
• Lifestyle Behaviors: Tobacco cessation and the reduction of alcohol consumption are strongly recommended. Maintaining a healthy diet and consistent physical activity are also central to the new guidance.
• Environmental and Social Factors: The inclusion of air pollution as a specific, modifiable risk factor is a notable update. Social isolation is also cited as a primary driver of risk, with the WHO encouraging active social engagement and cognitive training for those with mild cognitive impairment.

Notably, the WHO guidelines caution against the use of specific supplements, including vitamins B and E, omega-3 fatty acids, and multivitamins, for the sole purpose of dementia prevention in the absence of a diagnosed deficiency. The organization stated that current evidence suggests no proven benefit from these supplements for general prevention and noted the potential for unforeseen harmful effects.

Global and Policy Perspectives

The updated recommendations underscore a shift toward integrating brain health into existing primary care and noncommunicable disease (NCD) services. The goal is to provide governments and healthcare providers with evidence-based frameworks they can implement immediately to protect cognitive health.

"We know more today than ever before about what drives dementia risk, and these guidelines translate that knowledge into action. Countries now have clear, evidence-based recommendations they can put into practice immediately to protect people's cognitive health."

Dr. Tedros Adhanom Ghebreyesus, WHO Director-General, via WHO

Devora Kestel, Director of the WHO Department of Noncommunicable Diseases and Mental Health, noted that the impact of the condition extends beyond the clinical patient. Behind these numbers are individuals, families, and communities navigating profound challenges that affect not only health, but dignity, independence, and well-being, she stated. Kestel emphasized that the issue is not distant, as it touches communities globally.

As the global population continues to age, the World Health Organization maintains that understanding these risks is a critical social challenge. The organization is calling for stronger integration of services for NCDs, mental health, and brain health, noting that such investments can help individuals live longer, healthier, and more independent lives.