The Lancet June 06, 2015

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): a randomised controlled trial

Ngandu T, Lehtisalo J, Solomon A, et al.

Bottom Line

The FINGER trial demonstrated that a 2-year multidomain lifestyle intervention significantly improves or maintains cognitive functioning in older adults at increased risk for dementia compared to regular health advice.

Key Findings

1. The multidomain intervention significantly improved overall cognitive performance; the estimated mean change in the comprehensive neuropsychological test battery (NTB) total Z-score at 2 years was 0.20 (SE 0.02) in the intervention group versus 0.16 (SE 0.01) in the control group.

2. The between-group difference in the change of the NTB total score per year was 0.022 (95% CI 0.002 to 0.042; p=0.030) favoring the lifestyle intervention.

3. Domain-specific cognitive benefits were substantial, with the intervention group demonstrating 83% greater improvement in executive functioning, 150% greater improvement in processing speed, and 40% greater improvement in complex memory tasks compared to controls.

4. The intervention was generally safe and well-tolerated, with an overall dropout rate of 12%. Adverse events occurred in 7% of intervention participants versus 1% of controls, with musculoskeletal pain (5% vs. 0%) being the most common [3.1.1].

Study Design

Design

RCT

Double-Blind

Sample

1,260

Patients

Duration

2 yr

Median

Setting

Multicenter, Finland

Population Adults aged 60-77 years with an increased risk of dementia (CAIDE Dementia Risk Score ≥ 6 points) and cognition at the mean level or slightly lower than expected for age.

Intervention A 2-year multidomain lifestyle intervention comprising nutritional guidance, physical exercise, cognitive training, and intensive vascular risk monitoring.

Comparator General health advice and standard vascular care (control group).

Outcome Change in cognitive performance as measured by a comprehensive neuropsychological test battery (NTB) Z-score.

Study Limitations

• The 2-year follow-up period is relatively short compared to the decades-long preclinical phase of dementia, limiting conclusions about whether the intervention truly prevents or merely delays the onset of clinical Alzheimer's disease.

• Because it was a combined multidomain intervention, it is impossible to determine the relative efficacy, necessity, or synergistic contribution of each individual component (diet, exercise, cognitive training, vascular monitoring).

• Participants were highly motivated volunteers from a specific geographic and cultural region (Finland), which may limit the generalizability of the findings to more diverse populations or individuals with lower baseline health literacy.

• Although designed as a double-blind trial, true blinding is virtually impossible in intensive behavioral and lifestyle interventions, raising the possibility of performance bias.

Clinical Significance

The FINGER trial was a landmark proof-of-concept study that established multidomain lifestyle interventions as a viable, effective strategy for protecting cognitive function in at-risk older adults. By demonstrating that modifying multiple risk factors simultaneously provides tangible cognitive benefits, it shifted the dementia field toward proactive, comprehensive prevention and spurred the creation of the World-Wide FINGERS network to adapt and implement this model globally.

Historical Context

Prior to FINGER, efforts to prevent cognitive decline largely relied on observational data or single-domain randomized trials (e.g., studying only exercise or only dietary supplements), which frequently produced conflicting or underwhelming results. Published in 2015, FINGER provided the first rigorous, large-scale RCT evidence that targeting multiple modifiable vascular and lifestyle risk factors simultaneously could successfully alter the cognitive trajectory of at-risk individuals, marking a major paradigm shift in preventive neurology.

Guided Discussion

High-yield insights from every perspective

Med Student

Medical Student

How do the four components of the FINGER multidomain intervention (diet, exercise, cognitive training, and vascular risk monitoring) theoretically intersect to prevent the pathophysiological progression of dementia?

Key Response

This tests the foundational understanding of modifiable risk factors. Exercise increases BDNF and neurogenesis; a healthy diet reduces oxidative stress and neuroinflammation; vascular control minimizes white matter lesions and microinfarcts; and cognitive training builds cognitive reserve and synaptic plasticity. Together, they simultaneously target multiple pathways of neurodegeneration.

Resident

When screening an older adult in the primary care clinic, how would you identify if they are a candidate for a FINGER-like intervention, and what specific actionable lifestyle modifications would you prescribe based on the trial's protocol?

Key Response

Focuses on clinical application. The FINGER trial used the CAIDE risk score to identify at-risk patients (middle-aged vascular risk factors). The prescription involves moving beyond generic advice to combining structured aerobic and strength training, a Mediterranean or Nordic diet, active computer-based cognitive engagement, and tight metabolic and blood pressure control.

Fellow

The FINGER trial demonstrated significant improvements in executive functioning and processing speed, but not specifically in the memory domain. How does this cognitive profile inform our understanding of the predominant neuropathology being modified by this intervention?

Key Response

Promotes subspecialty thinking. Executive function and processing speed improvements are heavily linked to vascular health and frontostriatal networks, suggesting the intervention primarily mitigated vascular contributions to cognitive impairment rather than altering pure amyloid/tau (Alzheimer's) pathology.

Attending

Given the modest absolute effect size (difference in NTB Z-score of 0.022 per year) and high resource intensity of the FINGER intervention, how do you translate these findings into realistic, sustainable recommendations for patients without overwhelming them or the healthcare system?

Key Response

Tackles real-world applicability. Attendings must weigh clinical significance versus statistical significance and resource allocation. Teaching point: While multidomain interventions are efficacious in controlled settings, real-world effectiveness relies on finding scalable, community-based adaptations that patients can maintain long-term, perhaps introducing one domain at a time.

Scholarly Review

Critical appraisal through the lens of expert reviewers and guideline development

PhD

Multidomain interventions like FINGER make it difficult to isolate the active ingredient. From a trial design perspective, how would you design a follow-up study to determine synergistic versus additive effects of the individual components without requiring an unfeasible sample size?

Key Response

Critiques the black box nature of multidomain trials. A traditional 2x2x2x2 factorial design would require massive sample sizes. A SMART (Sequential Multiple Assignment Randomized Trial) or a fractional factorial design (like the MOST framework) would be a more methodologically sound approach to identify component efficacy and interactions efficiently.

Journal Editor

In reviewing the FINGER trial, how does the use of an active control group (general health advice) rather than a pure passive control impact the internal validity and the interpretation of the effect sizes, especially regarding the Hawthorne effect?

Key Response

Editors look for validity threats. An active control mitigates the Hawthorne effect and placebo-like expectations, making the results more robust against attention bias. However, it might underestimate the true effect size compared to a do-nothing control, which a seasoned reviewer must factor into the editorial significance of the modest Z-score differences.

Guideline Committee

Should current WHO and AHA/ASA guidelines on cognitive decline prevention be updated to strongly recommend structured, multidomain lifestyle interventions over single-domain advice, and what level of evidence does the FINGER trial provide for this recommendation?

Key Response

The FINGER trial provides Level 1b evidence (and Level 1a when combined with trials like MAPT and preDIVA in meta-analyses) that multidomain interventions are effective. In fact, the WHO explicitly cited the FINGER trial in their 2019 guidelines to issue a strong recommendation for multi-domain lifestyle interventions to reduce the risk of cognitive decline, moving away from isolated single-domain recommendations.

Clinical Landscape

Noteworthy Related Trials

2016

PreDIVA Trial

n = 3,526 · Lancet

Tested

Nurse-led intensive vascular care

Population

Community-dwelling adults aged 70-78 years

Comparator

Standard care

Endpoint

Incidence of all-cause dementia

Key result: Nurse-led intensive vascular care did not result in a statistically significant reduction in the incidence of all-cause dementia over 6.7 years.

2017

MAPT Trial

n = 1,680 · Lancet Neurol

Tested

Multidomain intervention (cognitive, physical, nutrition) plus omega-3

Population

Frail older adults with subjective memory complaints

Comparator

Placebo/Standard care

Endpoint

Change in cognitive composite score at 3 years

Key result: The multidomain intervention combined with omega-3 did not significantly slow cognitive decline over 3 years compared to placebo.

2019

SPRINT MIND Trial

n = 9,361 · JAMA

Tested

Intensive blood pressure control (target SBP <120 mm Hg)

Population

Adults 50 years or older with hypertension and high CV risk

Comparator

Standard BP control (target SBP <140 mm Hg)

Endpoint

Probable dementia

Key result: Intensive BP control significantly reduced the risk of mild cognitive impairment and the combined risk of MCI or probable dementia.

Tailored to your role

Want this tailored to you?

Add your specialty or training stage to get role-specific takeaways and more questions.

Personalize this analysis