WHO: Up to 45% of dementia risk can be prevented or delayed
New WHO guidelines state that addressing 14 modifiable lifestyle and environmental risk factors could prevent or delay up to 45% of dementia cases.
The World Health Organization (WHO) has announced that up to 45% of dementia risk could be prevented or delayed through targeted interventions, citing a range of modifiable factors including lifestyle choices, environmental exposures, and management of chronic conditions. The updated guidelines, released on July 15, 2026, reflect a significant expansion of the evidence base since the agency’s first dementia risk reduction recommendations in 2019, emphasizing prevention as the most effective strategy amid the absence of a cure.
Dementia, a condition caused by brain diseases that impairs memory, thinking, and daily functioning, affects more than 57 million people globally, with nearly 10 million new cases diagnosed annually. Alzheimer’s disease accounts for 60–70% of cases, according to the WHO. While the condition is not an inevitable part of aging, the organization stressed that addressing risk factors could drastically reduce its prevalence. “We know more today than ever before about what drives dementia risk, and these guidelines translate that knowledge into action,” said WHO Director-General Dr. Tedros Adhanom Ghebreyesus.
The guidelines highlight 14 evidence-based modifiable risk factors, including tobacco use, excessive alcohol consumption, physical inactivity, social isolation, air pollution, and noncommunicable diseases (NCDs) such as hypertension and diabetes. These factors, the WHO noted, account for up to 45% of dementia risk. The organization also emphasized the role of early intervention, recommending cognitive training and stimulation for adults with mild cognitive impairment, as well as better management of cardiometabolic conditions like high cholesterol.
Environmental factors, particularly air pollution, were singled out as critical areas for action. The WHO urged countries to implement measures to reduce exposure to pollutants, alongside promoting healthier lifestyles. “Stronger integration of services for noncommunicable diseases, mental health, and brain health is essential,” the guidelines stated. This includes expanding access to hearing aids, which may be incorporated into risk-reduction strategies.
Despite the focus on individual behaviors, the WHO acknowledged the broader societal and economic implications of dementia. The condition costs the global economy an estimated $1.3 trillion annually, with half of this burden attributed to unpaid care provided by families and friends. “Understanding risk factors and taking action to prevent dementia can improve health and quality of life, helping people live longer, healthier and more independent lives,” the organization said.
The updated guidance builds on a 2024 report by the Lancet Commission on dementia, which identified 14 modifiable risk factors and suggested that addressing them could delay or prevent 45% of dementia cases. While the report noted potential links between dementia and factors like sleep disorders, anxiety, and menopause, it highlighted that causal relationships remain unproven. The WHO’s recommendations align with this framework, advocating for a life-course approach to prevention that begins in early adulthood.
However, the guidelines explicitly advise against the use of vitamin B, vitamin E, omega-3 fatty acids, or multivitamins for dementia prevention, citing a lack of evidence for benefits that outweigh potential harms. This stance shows how much evidence-based interventions over unproven supplements.
Devora Kestel, director of the WHO’s Department of Noncommunicable Diseases and Mental Health, emphasized the personal and communal impact of dementia. “Behind these numbers are individuals, families, and communities navigating profound challenges that affect not only health, but dignity, independence, and well-being,” she wrote in a foreword to the guidelines. The WHO called on governments and health systems to act swiftly, framing prevention as both a public health imperative and an economic opportunity.
As the global population ages, the urgency of these recommendations grows. The WHO’s updated guidelines provide a roadmap for countries to mitigate dementia’s rising toll, combining individual action with systemic changes in healthcare and environmental policy. With the right strategies, the organization argues, the burden of dementia can be significantly reduced, offering hope for millions affected by the condition.
