An estimated 7.2 million Americans over the age of 65 are currently living with Alzheimer’s disease (AD). By 2060, that figure is projected to rise to nearly 13.8 million. These stark numbers reflect more than just demographic ageing; they signal a public health emergency that calls for urgent, proactive responses. While advancing age is the strongest predictor of cognitive decline, research has shown that losing cognitive function is not an unavoidable part of the ageing process.
As the prevalence of Alzheimer’s and related dementias grows at an alarming pace, researchers from Florida Atlantic University’s Charles E. Schmidt College of Medicine argue that prevention strategies must move beyond reliance on pharmacological treatments. In a recent commentary published in The American Journal of Medicine, authors call on clinicians, policymakers, and public health leaders to embrace lifestyle-based interventions as an underutilised yet powerful means of reducing the burden of cognitive decline, both in the United States and globally.
Charles H. Hennekens, M.D., co-author of the commentary and the First Sir Richard Doll Professor of Medicine and Preventive Medicine, highlighted the urgency of this approach: “While deaths from cardiovascular disease have declined since 2000, deaths from Alzheimer’s disease have surged by more than 140%. At the same time, it is estimated that as much as 45% of dementia risk may be linked to modifiable lifestyle and environmental factors.” His point underscores how small but widespread behavioural changes could have profound effects on population health.
The commentary stresses that lifestyle factors—such as physical inactivity, poor diet, obesity, alcohol use, hypertension, diabetes, depression, and social or intellectual isolation—play a pivotal role in determining dementia risk. The authors note that the very same therapeutic lifestyle changes already proven to reduce cardiovascular disease, cancer and other chronic illnesses may also improve brain health, and that when multiple risks are targeted simultaneously, their combined impact can be substantial.
Robust scientific evidence supports this view. The researchers highlight the POINTER trial, the first large-scale U.S.-based randomised study to evaluate lifestyle changes in older adults at elevated risk of cognitive decline. Participants who engaged in a structured programme—incorporating regular exercise, a hybrid Mediterranean–DASH diet, cognitive training, and social engagement—showed clinically meaningful improvements in global cognition over two years. Gains were particularly evident in executive functions, including memory, attention, and decision-making.
These findings closely align with the results from the Finnish FINGER trial, which also demonstrated that multidomain lifestyle interventions can improve cognitive outcomes in at-risk populations. Together, the two studies provide compelling evidence that the same strategies known to protect the heart and reduce cancer risk may also preserve brain function. According to Hennekens, these results suggest that lifestyle changes can be a “transformative” tool for brain health.
The biological mechanisms underpinning these benefits are increasingly well understood. Exercise stimulates the release of brain-derived neurotrophic factor, which promotes hippocampal growth, while also enhancing blood flow and reducing inflammation. Healthy dietary patterns lower oxidative stress and improve insulin sensitivity, while quitting smoking helps preserve the structural integrity of the brain. Regular social interaction and cognitive activity enhance neuroplasticity, thereby building resilience against cognitive decline. These mechanisms provide a clear scientific rationale for why lifestyle interventions can be so effective.
Finally, the implications for policy, health systems and society are profound. Pharmacological treatments for dementia are costly, often offer modest benefits, and may cause side effects ranging from headaches to serious complications. In contrast, lifestyle interventions are low-risk, cost-effective and broadly beneficial. Modelling studies suggest that reducing key risk factors by even 10% to 20% each decade could cut the burden of cognitive decline by up to 15%. With the societal cost of dementia care already exceeding $400 billion annually in the United States alone, the researchers argue that investing in preventive, lifestyle-focused strategies represents one of the most powerful tools available to mitigate the personal and economic toll of cognitive decline.
More information: John Dunn et al, Prospects for Clinicians to Reduce Cognitive Decline in Elderly Patients, The American Journal of Medicine. DOI: 10.1016/j.amjmed.2025.08.042
Journal information: The American Journal of Medicine Provided by Florida Atlantic University
