Dementia prevention requires systemic change beyond individual behavior, study shows

A new study from Curtin University is challenging the way we talk about preventing dementia. For years, the conversation has centered on what individuals can do—exercise regularly, eat well, maintain social connections, manage chronic conditions. These things matter. But researchers who mapped 61 potentially modifiable dementia risk factors found that prevention efforts have been placing the weight of responsibility almost entirely on personal choice, while largely ignoring the wider conditions that actually shape whether those choices are even possible.

The research, published in The Lancet Public Health, reveals a significant gap between where prevention efforts are focused and where the evidence actually points. The study found that while individual behaviors get most of the attention, far less emphasis is placed on social and environmental factors—education, housing, neighborhood safety, access to healthcare, air quality, and social connection—despite growing evidence that these conditions profoundly influence brain health across a person's lifetime. The implication is stark: asking someone to exercise more and eat better without addressing whether they live in a safe neighborhood, can afford healthcare, or have access to quality education is asking them to make healthier choices without providing the conditions that make those choices feasible.

Dr. Jennifer Dunne, lead author of the study and researcher at Curtin University's Dementia Centre of Excellence, framed the problem directly. Individual-focused prevention strategies risk placing blame on people for outcomes shaped by circumstances largely beyond their control. Where someone lives, what education they receive, the healthcare available to them, the air they breathe, and the economic conditions they navigate throughout their life all shape brain health. Focusing predominantly on individual behavior, she noted, amounts to asking people to make healthier choices without addressing the conditions that would make those choices possible.

The scale of the problem underscores why this reframing matters. Dementia currently affects an estimated 57 million people worldwide, a number projected to reach 139 million by 2050. In Australia alone, approximately 446,500 people are living with dementia today, with projections suggesting the number will exceed one million by 2065. Dementia has become the leading cause of death for Australians. These figures represent not just a health crisis but a social one—millions of people and families navigating a disease that current prevention strategies have largely failed to address at scale.

Professor Blossom Stephan, chair in dementia at Curtin's enAble Institute and co-author of the study, emphasized that the next step requires turning this evidence into action. Dementia prevention needs to shift toward a broader, population-wide approach that supports healthy individual choices while simultaneously improving education, neighborhoods, healthcare access, and other social conditions that shape brain health across entire populations throughout people's lives. This is not an argument against personal responsibility—it is an argument that personal responsibility cannot succeed without the infrastructure to support it.

Professor Tanya Buchanan, chief executive officer of Dementia Australia, reinforced this point. With 78 million people expected to be living with dementia worldwide by 2030, ensuring everyone has access to the supports and services needed to lower their risk has become urgent. Dementia risk reduction, she stated, is a collective responsibility. It requires not just individuals making better choices but governments and organizations implementing policies and actions that make it easier for everyone to lower their risk. The research suggests that without this systemic shift, prevention efforts will continue to fall short, leaving millions of people in conditions that make brain health protection nearly impossible.