Cognitive Health and Brain Aging: Evidence for Prevention
What the evidence shows about preventing cognitive decline and dementia, from the Lancet Commission risk-factor list to lifestyle, blood pressure, hearing and cognitive-training trials.
Content last updated . This page has not been medically reviewed.
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There is no cure for dementia, and the research on prevention is about lowering risk, not guarantees. [1] This page describes research only. It gives no supplement or medicine advice. Memory changes that worry you are a reason to see a clinician; see memory changes: when to get help.What trials show
| Intervention | Trial | Result |
|---|---|---|
| Combined lifestyle program | FINGER: 1,260 at-risk adults aged 60 to 77, 2 years | Small difference in cognition score (0.022 per year, 95% CI 0.002 to 0.042) vs general advice; musculoskeletal pain more common in the intervention group [3] |
| Structured vs self-guided lifestyle program | US POINTER: 2,111 adults aged 60 to 79, 2 years | Both groups improved; structured group improved slightly more (0.029 SD per year, 95% CI 0.008 to 0.050) [4] |
| Intensive blood pressure control | SPRINT MIND: 9,361 adults with hypertension, about 5 years follow-up | Probable dementia not significantly reduced (HR 0.83, 95% CI 0.67 to 1.04); mild cognitive impairment reduced (HR 0.81); the study may have been underpowered [5] |
| Hearing aids and counseling | ACHIEVE: 977 adults aged 70 to 84 with hearing loss, 3 years | No difference in cognitive change overall; a prespecified analysis suggested possible benefit in the higher-risk group [6] |
| Speed-of-processing cognitive training | ACTIVE: 2,021 Medicare enrollees, 20-year claims follow-up | Lower diagnosed dementia only in those who completed booster sessions (HR 0.75); no effect for memory or reasoning training [7] |
Reading the table: the effects in lifestyle trials were small, the outcomes were test scores rather than dementia diagnoses, and the groups were followed for two years. [3][4] US POINTER's authors said further follow-up is needed to judge clinical relevance and sustainability. [4] The ACTIVE dementia finding used insurance claims, not clinical assessment, and was a subgroup of a trial arm. [7] Label: mixed.
Sleep, social life and other factors
Cohort links exist for sleep and social connection, but whether changing them prevents dementia is unproven; see sleep and healthy aging and stress, loneliness and social connection. For alcohol and tobacco, see smoking, alcohol and healthy aging.What this page does not say
Supplements, "nootropics" and commercial brain-training apps are outside this page's evidence. See cognitive performance and nootropics and do brain training games work?. No source read here supports a specific medicine or supplement for preventing dementia in healthy people.Related guides
Frequently asked questions
Can dementia be prevented?
Some risk may be lowered. A Lancet Commission estimate, as described in a 2025 analysis, is that 14 modifiable factors account for about 45% of cases, but that does not mean 45% can be prevented in practice. [2]
Do lifestyle programs protect memory?
In two trials of multidomain programs, cognitive scores improved slightly more than comparison groups; dementia itself was not the outcome. [3][4]
Does lowering blood pressure prevent dementia?
In SPRINT MIND, intensive control reduced mild cognitive impairment but the reduction in probable dementia was not statistically significant. [5]
Do hearing aids prevent cognitive decline?
Not in the overall ACHIEVE trial; possible benefit in a higher-risk subgroup needs confirmation. [6]
Are brain-training games proven?
One cognitive-training approach (speed training with boosters) was linked to fewer diagnosed dementia cases in a 20-year claims analysis; other training types showed no effect. [7]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
How to read the evidence labels
Labels used on this page: established (consistent trial or cohort evidence), promising but limited, mixed, insufficient evidence, no good evidence of benefit. A risk factor identified in cohorts is not proof that changing it prevents dementia.
The risk-factor framework
WHO lists these actions as linked with lower risk: being physically active, not smoking, avoiding harmful alcohol use, a healthy diet, staying socially and cognitively active, healthy weight, managing blood pressure, cholesterol and blood sugar, using hearing aids where needed, and reducing air pollution. [1] Label: promising but limited for prevention overall.
Who should check first
References
- World Health Organization. Dementia fact sheet. Read 2026-10-22.
- Global, regional and national population attributable fraction of potentially modifiable risk factors for dementia in the adult population: an analysis using global health databases. BMJ Public Health 2025 (open access, via Europe PMC PMC12699679); describes the Lancet standing Commission 2024 report. Read 2026-10-22.
- A 2 year multidomain intervention of diet, exercise, cognitive training, and vascular risk monitoring versus control to prevent cognitive decline in at-risk elderly people (FINGER). Lancet 2015. Read 2026-10-22 (abstract on PubMed).
- Structured vs self-guided multidomain lifestyle interventions for global cognitive function: the US POINTER randomized clinical trial. JAMA 2025. Read 2026-10-22 (abstract on PubMed).
- Effect of intensive vs standard blood pressure control on probable dementia: a randomized clinical trial. JAMA 2019. Read 2026-10-22 (abstract on PubMed).
- Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE). Lancet 2023. Read 2026-10-22 (abstract on PubMed).
- Impact of cognitive training on claims-based diagnosed dementia over 20 years: evidence from the ACTIVE study. Alzheimers Dement (N Y) 2026. Read 2026-10-22 (abstract on PubMed).