Potentially Modifiable Risk Factors for Dementia and Mild Cognitive Impairment: An Umbrella Review and Meta-Analysis.
Level 1 - systematic review of randomized trials
Umbrella review and meta-analysis synthesizing 45 systematic reviews and 212 meta-analyses of modifiable risk factors
PubMed 38346414 · doi:10.1159/000536643
What was done
An umbrella review and multi-level random-effects meta-analysis was conducted across multiple databases to synthesize systematic reviews and meta-analyses examining potentially modifiable risk factors for mild and major neurocognitive disorders (NCDs), as well as Alzheimer's disease and vascular dementia subtypes, while accounting for overlap among included reviews.
What was found
The authors analyzed 45 systematic reviews containing 212 meta-analyses. Fourteen modifiable risk factors showed significant associations with major NCD: alcohol consumption, body weight, depression, diabetes mellitus, diet, hypertension, less education, physical inactivity, sensory loss, sleep disturbance, smoking, social isolation, traumatic brain injury, and vitamin D deficiency. All 14 were linked to major NCD, whereas five were associated with mild NCD. The abstract does not report specific numerical effect sizes or risk ratios.
Why it matters
This study provides an aggregated synthesis of 14 modifiable targets for dementia prevention, highlighting several emerging factors like sensory loss, sleep disturbance, and vitamin D deficiency that are often omitted from public health action plans.
Limits
The abstract does not provide numerical effect estimates or confidence intervals. Evidence for mild NCD and vascular dementia was substantially more limited than for major NCD, and umbrella reviews are subject to the inherent methodological biases, heterogeneity, and residual confounding present in the underlying observational primary studies.
Cited by
- supports Subtle or severe sensory loss, such as hearing or vision loss, accelerates cognitive decline and is associated with increased risk or symptoms of Alzheimer's disease.