Up to 45% of dementia risk can be prevented, delayed: WHO

The World Health Organization (WHO) has released updated global guidelines asserting that up to 45% of dementia risk could be prevented or delayed by addressing modifiable risk factors across a person's life. Published July 15, 2026, the new framework shifts the perception of dementia from an inevitable consequence of aging to a manageable public health priority.

Dementia, caused by brain diseases that impair memory and thinking, is the seventh leading cause of death globally. More than 57 million people currently live with the condition, and nearly 10 million are diagnosed every year. Alzheimer disease remains the most common form, estimated to account for 60 to 70% of all cases. The economic toll is substantial, costing the global economy an estimated $1.3 trillion annually, with approximately half of that figure driven by unpaid care from friends and family.

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While no cure exists, the Who states that a significant portion of risk is linked to factors under individual or systemic control. This updated guidance builds upon the agency's first set of recommendations issued in 2019, incorporating a grown evidence base including findings from the 2024 Lancet Commission. Experts note that the "up to 45%" figure describes a theoretical maximum if all targeted risks were optimally managed over a lifetime.

The Modifiable Risk Factors

The WHO's updated recommendations categorize risk reduction into lifestyle adjustments, the management of medical conditions, and environmental exposures.

Lifestyle and Behavioral Changes The guidelines encourage increased physical activity, tobacco cessation, and the reduction of harmful alcohol consumption. The agency specifically recommends the adoption of healthy dietary patterns.

To protect cognitive reserve, the WHO recommends cognitive stimulation and training for adults with normal cognition or those experiencing mild cognitive impairment. This includes mental stimulation and participation in social activities.

The agency explicitly does not recommend the routine use of omega-3 polyunsaturated fatty acids, multivitamins, minerals, or vitamins B and E in the absence of a diagnosed deficiency. The WHO cites a lack of evidence and potential harmful effects, stating that benefits do not outweigh these unexpected risks.

Medical and Sensory Management Rigorous control of noncommunicable diseases (NCDs) is central to the strategy. This includes the management of hypertension, diabetes, and high cholesterol. Midlife onset of type 2 diabetes is significantly associated with higher risk, whereas late-life onset is not. Treatment for depression—via medication or psychotherapy—is also highlighted as a way to lower risk.

The WHO recommends the use of hearing aids for those with hearing loss. New evidence integrated into the framework also highlights untreated vision loss as a risk factor.

Environmental Factors For the first time, the WHO has included the reduction of exposure to ambient air pollution as a recommended strategy.

Expert Perspectives and Implementation

"We know more today than ever before about what drives dementia risk, and these guidelines translate that knowledge into action,"

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

Devora Kestel, director of the WHO's NCDs and mental health department, wrote that the issue "touches all of us" and affects dignity, independence, and well-being.

Dementia Prevention Guide

Based on the latest WHO and Lancet Commission data, the following interventions are recommended across different life stages:

• Early Life (Under 18): Prioritizing the completion of secondary education to build a higher cognitive reserve.
• Midlife (18 to 65): Managing vascular pathways by treating high LDL cholesterol, hypertension, and type 2 diabetes; quitting smoking and reducing alcohol intake.
• Late Life (Over 65): Utilizing hearing aids and vision correction; maintaining social engagement and cognitive stimulation to prevent isolation.
• Universal: Reducing exposure to air pollution.

The WHO emphasizes that because there is no widely accessible treatment or cure, prevention is the most effective strategy to reduce the number of cases. The agency calls for the stronger integration of brain health services with existing mental health and NCD primary care. Implementation will require sustained policy action, including urban design to promote physical activity and environmental laws to improve air quality.