Almost 50% of Dementia Cases Could Be Prevented: New Advice on How to Achieve It

The World Health Organisation’s latest update on dementia prevention guidelines has sparked hope that nearly half of all cases can be prevented or delayed. But as we welcome this new advice, it’s essential to separate the wheat from the chaff and examine what lies beneath the headlines.

At its core, this new advice is about shifting the focus from individual choices to systemic change. The WHO is urging countries to rethink their approach to public health by acknowledging that environmental and social determinants play a significant role in dementia risk.

For instance, the guidelines emphasize the importance of reducing exposure to air pollution, which can affect people living in industrial areas or large cities. This may come as a surprise to some, but it highlights the need for governments to take a comprehensive approach to public health.

A healthy diet rich in leafy greens, berries, nuts, and olive oil, and low in processed and ultra-processed foods, is now considered essential for reducing dementia risk. The WHO’s stance on dietary recommendations echoes the growing body of evidence that suggests a Mediterranean-style diet can have profound benefits for cognitive health.

However, some aspects of the guidelines are more nuanced than others. The recommendation against vitamin and mineral supplements to reduce cognitive decline and dementia risk may be disappointing to those who had pinned their hopes on this approach. The WHO’s cautious stance on menopausal hormone therapy (MHT) is also understandable, given the “messy” evidence base.

To make a significant impact, policymakers must stop treating public health as a secondary concern. Investing in whole-of-population interventions – such as promoting healthy diets, increasing physical activity, and improving air quality – can help reduce dementia risk.

Eliminating modifiable risk factors will require coordinated efforts from governments, healthcare providers, and communities to create environments that support healthy aging. As Scientia Professor Kaarin Anstey notes, this is a tall order, but it’s essential for creating a future where half of all dementia cases are preventable or delayed.

The WHO’s guidelines offer a glimmer of hope that we can make a difference, but only if we’re willing to take bold action. Governments must invest in evidence-based interventions and policies that prioritize public health over individual choices. Will they rise to the challenge? Only time will tell.