The World Health Organization (WHO) has just unveiled an updated version of its guidelines aimed at lowering the risk of dementia and cognitive decline. This second edition, released on July 15, 2026, builds on its 2019 guidelines, suggesting that up to 45% of dementia cases could potentially be delayed or even prevented altogether.
The report synthesizes the latest findings and aims to provide useful recommendations for individuals and healthcare professionals alike, thereby reducing the future burden of dementia.
Dr. Tedros Adhanom Ghebreyesus, WHO’s Director-General, emphasized that our understanding of dementia risk has improved significantly and that these guidelines offer actionable insights. He noted that countries now possess clear, evidence-backed suggestions for safeguarding cognitive health.
Dementia currently impacts over 57 million people globally, with this number climbing each year, particularly in low- and middle-income regions. While research for a cure continues, the WHO suggests a notable fraction of dementia cases—about 45%—are tied to modifiable risk factors, which means we can potentially take action.
Crucially, many of these risk factors overlap with other chronic conditions, such as cardiovascular disease and type 2 diabetes. Addressing these issues at a global scale could lead to more years of healthy living for countless individuals.
The WHO has organized the recommended interventions into four categories:
- promoting healthy behaviors
- managing existing health conditions that could elevate dementia risk
- addressing environmental risk factors
- targeting multiple risk factors simultaneously
Discussing healthy behaviors, the report points to activities that stimulate cognitive and social engagement, as well as physical activity, alcohol moderation, and proper nutrition.
Research indicates individuals with higher education levels or cognitively demanding jobs tend to have a lower risk of dementia, possibly due to what’s termed “cognitive reserve.”
- cognitive training
- cognitive stimulation through games
- engaging in activities like reading or making music
Dr. Ryuta Kawashima, a professor in brain imaging, remarked that these guidelines affirm what some academics have argued: keeping the brain engaged is crucial. Simple activities like reading aloud or playing games require no fancy tech—just consistency and a willingness to explore.
Interestingly, about one in four older adults report feelings of isolation. The report estimates that tackling loneliness could prevent around 5% of dementia cases, as social interactions might build cognitive reserves.
Regular physical activity is also linked to reduced risks of Alzheimer’s disease and cognitive decline. This effect is even more pronounced with sustained, intense exercise over time.
Alcohol consumption is implicated in approximately 2.6 million deaths annually and is connected to various health conditions, including cognitive decline. The report suggests that eliminating alcohol could prevent 1% of dementia cases, while abstaining for six to twelve months might improve cognitive functions.
Furthermore, tobacco use remains a significant preventable cause of death, with mid-life smoking being more strongly associated with dementia than smoking in older age.
The report critiques the efficacy of supplements like vitamin B, vitamin E, omega-3, or multivitamins, recommending them only in cases of deficiency, citing either inadequate evidence or potential harm.
When it comes to diet, the authors emphasize that a balanced diet should:
- include essential nutrients
- provide balanced energy intake
- consist of a variety of nutritious foods
- be moderate with harmful foods or nutrients
Certain diets—like the Mediterranean, DASH, and MIND diets—are linked to better cognitive health. A well-rounded diet may have benefits due to its antioxidant and anti-inflammatory properties, reducing risks of high blood pressure and obesity.
Additionally, managing existing health conditions associated with cognitive decline is crucial. The specific conditions mentioned include:
- obesity, with a call for dietary interventions for those affected
- diabetes, as type 2 diabetes significantly increases dementia risk
- hypertension, a well-recognized dementia risk factor
- dyslipidemia, where statins can be beneficial in controlling cholesterol levels and may protect against dementia
- hearing loss, as it is linked to cognitive decline; reducing hearing loss could cut dementia cases by 7%
The report found insufficient evidence regarding other conditions, like sleep quality and its relationship to dementia risk. This surprised some experts, given the established links between poor sleep and increased dementia risk.
Environmental concerns are also highlighted, particularly the impact of PM2.5—tiny particles that can cross the blood-brain barrier and may contribute to neurodegeneration.
Sources of PM2.5 include:
- vehicle emissions
- industrial pollution
- wildfires
- domestic wood burning
These pollutants are associated with several health issues, including cognitive decline.
The WHO emphasizes a “multidomain” and “tailored” approach—addressing multiple risk factors in a way that suits specific populations. For instance, a recent study in Latin America involved supervised exercise routines and locally relevant dietary advice for older adults at risk, showing promising cognitive benefits.
Participants in this program experienced significant cognitive improvements compared to a control group who only attended a few meetings.
Reflecting on the report’s evolution from 2019, Dr. Perlmutter pointed out the new inclusion of air pollution as a significant risk factor for dementia, emphasizing the growing evidence around its impact on neuroinflammation and degeneration.
Despite this, the overarching message remains consistent: significant opportunities for reducing dementia risk lie in addressing modifiable lifestyle and vascular factors early on.
He noted that the evidence base is stronger now, and he appreciated the WHO’s endorsement of multidomain interventions as effective tools. In terms of practical steps, he advises focusing on building a healthy lifestyle, prioritizing physical activity, maintaining blood sugar levels, and minimizing exposure to harmful environments.
Kawashima added that even small, daily cognitive challenges can be important. Simple activities like reading aloud or learning something new can go a long way.
Ultimately, as La Puma succinctly stated, in our modern era, cultivating cognitive resilience requires intentional effort, and it is within our reach.
