No trial reviewed here shows that lifestyle changes prevent dementia, but two large trials found that programs combining exercise, diet and mental and social activity modestly improved scores on cognitive tests. In the FINGER trial, a two-year program improved a cognitive composite slightly more than control, [ngandu-2015] and in US POINTER a structured program beat a self-guided one by 0.029 standard deviations a year. [baker-2025] This guide covers what each trial tested, what it found, what it could not show and what a reader can reasonably do. Our overview of dementia covers the wider picture.
Can lifestyle changes prevent dementia?
Not shown. The multidomain trials measured cognitive function and were not designed to count how many people developed dementia. The US POINTER authors state that the trial was not powered to assess cognitive impairment or dementia outcomes, and that the durability and long-term clinical significance of the interventions are unknown. [baker-2025]
That sits alongside a population-level argument. The Lancet Commission on dementia urged policy makers to prioritise risk reduction to prevent or delay dementia, and it described the evidence for multidomain interventions as preliminary, with few completed studies and more than 40 trials ongoing. [livingston-2024] Reducing risk across a population is not a promise for one person. Our guide to hearing loss and dementia covers the biggest single risk factor on that list.
What did the FINGER trial find?
It found a small gain in cognition for a two-year multidomain program compared with control. FINGER was a population-based randomised trial in six centres in Finland. Of 2,654 people screened, 1,260 were randomly assigned to the intervention (631) or control (629), and the program combined diet, exercise, cognitive training and vascular risk monitoring. [ngandu-2015]
The mean change in the neuropsychological test battery total score at two years was 0.20 in the intervention group and 0.16 in the control group, a between-group difference of 0.022 per year (95% confidence interval 0.002 to 0.042; p = 0.030). Of the 1,260, 153 (12%) dropped out. Adverse events occurred in 46 intervention participants (7%) against six controls (1%), most often musculoskeletal pain. [ngandu-2015] The authors concluded that a multidomain intervention could improve or maintain cognitive functioning in at-risk older adults from the general population. [ngandu-2015]
What did the US POINTER trial find?
It found that a structured program improved a cognitive composite slightly more than a self-guided one, and that both improved. US POINTER enrolled 2,111 older adults aged 60 to 79 at risk of cognitive decline, who were sedentary and had a suboptimal diet plus other risk criteria. They were randomly assigned to a structured program (1,056) or a self-guided one (1,055) for two years at five US sites, and 89% completed the year-two assessment. [baker-2025]
The structured group attended 38 facilitated team meetings and followed aerobic exercise four days a week for 30 to 35 minutes, resistance training two days a week, flexibility work two days a week, the MIND diet, web-based cognitive training three times a week, and twice-yearly review of blood pressure, cholesterol and blood sugar. The self-guided group received public education materials, six peer team meetings and encouragement without goal-directed coaching. [baker-2025]
The cognitive composite rose by 0.243 standard deviations a year in the structured group and 0.213 in the self-guided group, a difference of 0.029 (95% confidence interval 0.008 to 0.050; p = 0.008). The benefit appeared greater for people with lower baseline cognition. Fewer serious adverse events were reported in the structured group (151) than in the self-guided group (190). [baker-2025]
Left view: US POINTER, mean rate of increase per year in the global cognitive composite, Baker et al. (2025), 1,056 structured and 1,055 self-guided. Right view: FINGER, estimated mean change in the neuropsychological test battery total score at two years, Ngandu et al. (2015), 631 intervention and 629 control. The two composites are scaled differently, so compare within a view and not between views.
| Question | FINGER | US POINTER |
|---|---|---|
| Who | 1,260 at-risk older adults in Finland | 2,111 at-risk older adults in the US |
| Length | Two years | Two years |
| Comparison | Control | Self-guided program |
| Difference | 0.022 a year | 0.029 SD a year |
| Measured | Cognitive test composite | Cognitive test composite |
| Counted dementia? | No | No, not powered for it |
What do these trials not show about preventing dementia?
They do not show that any program prevents dementia, and they do not show which part of a program does the work. The US POINTER authors list their limits: only five sites, selective enrolment, a trial not powered for dementia outcomes, a self-guided group that was not a true no-intervention control, participants who knew which program they were in, and long-term significance still unknown. [baker-2025]
Both interventions bundled exercise, diet, cognitive training and health checks, so the trials cannot give a figure for exercise alone or diet alone. The trial was supported by the Alzheimer’s Association, whose employees took part in its design and conduct, and a blueberry council provided rebates for the structured group. [baker-2025] The authors call the clinical significance of the difference something that needs further research.
What can you do with this evidence?
Treat the programs as a menu of reasonable habits and not as a proven shield. The structured US POINTER program is the most detailed example of what was tried: regular aerobic exercise, resistance and flexibility work, a diet built on MIND guidelines, regular cognitive challenge, social engagement and monitoring of blood pressure, cholesterol and blood sugar. [baker-2025] These are our summary of the trial’s components, not a prescription, and anyone with a health condition should check with a doctor before raising their exercise.
A walking session
The structured US POINTER program included aerobic exercise four days a week for 30 to 35 minutes. This timer is a way to practise one session length, not a treatment. Choose a pace that lets you talk, and stop if you feel unwell.
15:00
Walk at a pace that is a little brisk but still lets you hold a conversation. If you can, walk with someone, since social contact was part of the programs tested.
Done. Note how you feel, and whether it is a habit you could repeat on most days.
Hearing and blood pressure checks are the least glamorous items on the list. A hearing test, in particular, is worth having for its own sake, and our guide to hearing loss and dementia covers what trial evidence there is on treating it. No screener on this site measures dementia risk. The self-assessment hub lists the seven we do have.
When to seek help
Speak to a doctor if you or someone close notices memory or thinking changes that affect daily life, rather than waiting to see whether they pass. Our guide to the early signs of dementia covers what to look for, and depression or dementia covers why low mood can look like cognitive decline.
If you care for someone with dementia, our guide to supporting someone with dementia covers the practical side. If you feel unable to keep yourself safe, contact your local emergency services or a crisis helpline.
How MyFreud can help
Habits are easier to keep when you can see them. Daily mood tracking in MyFreud shows how your days go over weeks, and the notepad is somewhere to log walks, social plans and questions to ask a doctor. It does not replace medical care.
Download MyFreud and start today: App Store or Google Play.