Published May 31, 2026 1 min read

# Much of dementia risk runs through factors you can influence

## The short version

The 2024 Lancet Commission estimates about 45 percent of dementia cases are tied to 14 factors you can influence, at the population level. That is not a promise you can cut your own risk by 45 percent. For carriers, the highest-leverage starts are exercise, blood pressure, lipids, and metabolic health.

By the OutliveAPOE4 editorial team. [How we research & source](/methodology).

Here is the single most useful number in dementia prevention: the **2024 Lancet Commission estimates that about 45% of dementia cases are tied to 14 modifiable risk factors** across life. It is a population-level estimate, not a personal guarantee, but it reframes the picture from waiting and worrying to doing something concrete.

“Modifiable” describes population risk, not a promise to an individual; our [APOE4 risk primer](/topics/apoe4-and-alzheimers-risk) puts that distinction in context. The [US POINTER review](/topics/us-pointer-trial-and-lifestyle) is the deeper evidence check, and the [exercise guide](/topics/exercise-and-apoe4) offers one concrete starting protocol.

The factors are not all equal. The largest in the model are **hearing loss, high LDL cholesterol** (low-density lipoprotein, whose particles can deposit cholesterol in artery walls), **and less education**, followed by smoking, depression, social isolation, physical inactivity, diabetes, high blood pressure, obesity, excess alcohol, traumatic brain injury, air pollution, and (added in 2024) vision loss. For carriers, the highest-leverage and best-evidenced are exercise, blood pressure, lipids, and metabolic health.

Your genotype is only one input. You cannot change it, but you can act on the factors around it, and the payoff is bigger the earlier you start, while interventions have decades to compound. None of this promises prevention, and how much any one person can shift their own risk is genuinely uncertain. But the direction is encouraging. Start with the [levers you control](/start-here), or go straight to the highest-leverage one, [exercise](/topics/exercise-and-apoe4).

## Source & references

1.  [Livingston et al. (2024), The Lancet Commission: dementia prevention, intervention, and care](https://www.thelancet.com/commissions-do/dementia-prevention-intervention-and-care)

## Related deep dives

-   [APOE4 and Alzheimer’s risk: what the numbers actually mean Relative risk, absolute risk, and age of onset: how to read the scary statistics about APOE4 and Alzheimer’s, with real ranges and the hopeful part that gets buried.](/topics/apoe4-and-alzheimers-risk)
-   [The FINGER trial: can lifestyle change the trajectory? The landmark FINGER study tested whether a combined lifestyle program could protect cognition in at-risk older adults. What it found, the global trials it inspired, and why it matters for carriers.](/topics/finger-trial-and-lifestyle)
-   [How much exercise should APOE4 carriers get? A practical weekly exercise target for APOE4 carriers, why cardio and strength protect different systems, and how to start without treating exercise as a guarantee.](/topics/exercise-and-apoe4)
-   [Blood pressure and brain health High blood pressure is one of the best-established modifiable risk factors for dementia. Why it matters so much for APOE4 carriers, the numbers, and how to keep it in range.](/topics/blood-pressure-and-brain-health)