Opportunity, Not Blame: How We Talk About Dementia Prevention Matters

I recently came across a company advertising that up to 45% of dementia cases may be preventable.

I’d seen this statistic before in the medical literature. But seeing it in a consumer advertisement made me stop and think about how easily a well-intentioned message could be heard as something very different.

As a breast cancer survivor, I’ve felt the unintended weight of statements like that before. When public messaging focuses heavily on prevention, it’s easy for people to hear something very different than what was intended:

“If you got sick, you must have done something wrong.”

After my diagnosis, I did what I suspect many cancer patients do. I replayed my life, looking for the missing piece. Was it something I ate? Was it stress? An environmental exposure? Then came the well-meaning questions from others trying to make sense of it.

• “Does it run in your family?”
• “Did you eat organic?”

Most people aren’t trying to be insensitive. They’re looking for reassurance that if they make the “right” choices, it won’t happen to them. That’s a very human response.

After a diagnosis, people naturally look backward, searching for an explanation. Psychologists call one part of this hindsight bias—the tendency to see an outcome as more predictable once we already know what happened.¹ But for the person living with the disease, those questions can quietly become guilt.

The statistic itself comes from excellent research and has appeared in peer-reviewed journals and expert consensus reports.² The problem isn’t the science—it is how easily the message can be misunderstood. Discussions about reducing risk can unintentionally start to sound like assigning blame.

Dementia, like cancer, is extraordinarily complex. Age, genetics, biology, environmental exposures, vascular health, and simple chance all contribute to who develops disease and who doesn’t. Living a healthy lifestyle may lower your risk, but it can never eliminate that risk entirely. Likewise, developing dementia does not mean you failed to take care of yourself.

Once we separate personal responsibility from population health, the research becomes far more encouraging than discouraging.

What the “45% Preventable” Figure Actually Means

The statistic comes from the 2024 Lancet Commission on Dementia Prevention, Intervention, and Care.² After reviewing decades of research, the authors estimated that up to 45% of dementia cases might be delayed or prevented at the population level if 14 modifiable risk factors were addressed across the lifespan.

That does not mean 45% of individuals could avoid dementia simply by making different daily choices.

Many of these factors—including early childhood education, air pollution, high LDL cholesterol, traumatic brain injury, hearing loss, hypertension, obesity, diabetes, smoking, depression, physical inactivity, social isolation, excessive alcohol use, and vision loss—are deeply influenced by public policy, access to healthcare, and socioeconomic conditions, not just personal decisions.²

It’s also worth remembering that “modifiable” doesn’t always mean something a person can change now. We can’t go back and undo decades of untreated hearing loss, change the educational opportunities someone had as a child, or erase years of limited access to healthcare. These are factors researchers study because they help us understand risk across populations—not because they allow us to judge an individual’s story.

Where the Science Points

When we look closer at the evidence, a few interconnected areas stand out.

Untreated hearing loss represents one of the largest modifiable risk factors in the Lancet analysis.² There are several possible reasons for the connection. Hearing loss reduces sensory input to the brain, makes the brain work harder to process speech, and can contribute to social isolation. In one large study, treating hearing loss didn’t slow cognitive decline across the entire study population, but it did appear to help people who were already at higher risk. Observational studies have also linked hearing-aid use with less cognitive decline.^3,4

Cardiovascular health plays an equally central role: what protects the heart generally protects the brain, making the management of blood pressure, cholesterol, and diabetes crucial over a lifetime.² Regular physical activity supports cardiovascular and metabolic health, while sleep is increasingly being studied for its relationship to brain health and the glymphatic system—the brain’s waste-clearance pathway.⁵ Finally, lifelong learning and social connection build cognitive reserve, giving the brain greater capacity to maintain function despite age-related or neuropathological changes.⁶

Changing the Frame

The goal isn’t to stop talking about dementia prevention. Quite the opposite—we should be talking about it more. But we can do it in a way that encourages action without unintentionally creating guilt.

Consider these two ways of saying essentially the same thing:

“Up to 45% of dementia cases are preventable.”

“Research suggests there are more opportunities than we once realized to reduce the risk of dementia over a lifetime.”

The science is similar, but the emotional response is entirely different. The first statement can sound more absolute and may invite people to look backward in search of an explanation. The second emphasizes opportunity and invites people to look forward.

When we communicate about brain health, we should hold two truths at once: there are meaningful steps we can take to reduce risk, and no one develops dementia because of a single decision or a single missed opportunity.

Opportunity, Not Blame

The point of prevention research is to understand where we may have opportunities to reduce risk—not to look back and assign responsibility after someone develops dementia.

The goal was never to leave patients feeling responsible for a disease they couldn’t completely control, but to highlight where better healthcare, public policy, and daily habits can make a real difference. Many people who develop dementia did everything “right,” and living well can lower risk without eliminating it.

If we want patients and families to engage with brain health, we have to meet them with context rather than soundbites—offering clear opportunities to lower risk without ever leaving room for blame.

References

1. Roese NJ, Vohs KD. Hindsight bias. Perspect Psychol Sci. 2012;7(5):411-426. doi:10.1177/1745691612454303
2. Livingston G, Huntley J, Liu KY, et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. Lancet. 2024;404(10452):572-628. doi:10.1016/S0140-6736(24)01296-0
3. Lin FR, Pike JR, Albert MS, et al. Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. Lancet. 2023;402(10404):786-797. doi:10.1016/S0140-6736(23)01406-X
4. Yeo BSY, Song HJJMD, Toh EMS, et al. Association of hearing aids and cochlear implants with cognitive decline and dementia: a systematic review and meta-analysis. JAMA Neurol. 2023;80(2):134-141. doi:10.1001/jamaneurol.2022.4427
5. Nedergaard M, Goldman SA. Glymphatic failure as a final common pathway to dementia. Science. 2020;370(6512):50-56. doi:10.1126/science.abb8739
6. Stern Y, Arenaza-Urquijo EM, Bartrés-Faz D, et al. Whitepaper: defining and investigating cognitive reserve, brain reserve, and brain maintenance. Alzheimers Dement. 2020;16(9):1305-1311. doi:10.1016/j.jalz.2018.07.219