- Cognitive Health
- Health
- Brain Health
- Education
- by The Memory Exam Team
- Sept. 15, 2026
A review of 61 changeable risk factors found that prevention advice leans heavily on personal behavior and says little about the conditions people live in.
Almost every piece of advice about dementia risk, including some of ours, is addressed to you as an individual. Eat this, walk more, sleep better. A paper in The Lancet Public Health argues that this framing is incomplete in a way that matters.
What Is the Argument?
Earlier work had already counted the changeable risks. A systematic review published in 2024 reported population attributable fractions for 61 of them, which is a long list of things that influence whether someone develops dementia.
The newer paper asks a different question: of those, which ones do prevention efforts actually talk about? Its answer is that individual behavior gets most of the attention, while education, housing, access to healthcare, clean air and opportunities for social connection get much less, despite shaping brain health across a whole lifetime.
Why Does That Matter to You?
Two reasons, pulling in different directions.
The first is fairness. If risk is driven partly by circumstances, then telling people their dementia risk is a matter of personal discipline is both wrong and unkind. A great deal of what shapes brain health was settled long before anyone chose a diet.
The second is practical. The things you can change are still worth changing. The point is not that individual action is pointless; it is that individual action was never the whole story, and nobody should feel they have failed if they did everything on the list.
So What Is Worth Taking From It?
Do the things with good evidence behind them, without treating them as a guarantee or yourself as responsible for the outcome. And be sceptical of anything that promises prevention through one product, one food or one supplement, because that is the version of this story with something to sell.
Where This Information Comes From
Dunne J, Siervo M, Anstey KJ, and others. Beyond individual-level approaches to dementia prevention: a socioecological reappraisal. The Lancet Public Health 2026;11(10):e831-e835. doi:10.1016/S2468-2667(26)00171-4
Stephan BCM, Cochrane L, Kafadar AH, and others. Population attributable fractions of modifiable risk factors for dementia: a systematic review and meta-analysis. The Lancet Healthy Longevity 2024;5(6):e406-e421. doi:10.1016/S2666-7568(24)00061-8