An updated meta-analysis of cohort studies: Diabetes and risk of Alzheimer's disease.
Level 3 - non-randomized controlled study
Systematic review and meta-analysis of observational cohort studies
PubMed 28088029 · doi:10.1016/j.diabres.2016.10.024
What was done
Authors conducted a systematic review and meta-analysis of longitudinal population-based cohort studies published up to May 2016 without language restrictions to evaluate the association between diabetes mellitus and the risk of Alzheimer's disease (AD). Analyses were performed using Stata software, including subgroup analyses stratified by population (Eastern vs. Western cohorts).
What was found
A total of 17 studies involving 1,746,777 individuals were included. Pooled analysis demonstrated that individuals with diabetes had a significantly higher incidence of AD compared to those without diabetes (RR: 1.53, 95% CI: 1.42–1.63). In stratified analyses, the relative risk of AD was 1.36 (95% CI: 1.18–1.53) across 12 Western cohorts and 1.62 (95% CI: 1.49–1.75) across 5 Eastern cohorts.
Why it matters
This large meta-analysis confirms that diabetes is consistently associated with an elevated risk of Alzheimer's disease across diverse populations, supporting metabolic health as a potential target in dementia prevention.
Limits
The findings are derived entirely from observational cohort studies, preventing causal conclusions. The abstract does not provide details on study heterogeneity, diabetes type (type 1 vs. type 2), diabetes duration, glycemic control, medication use, or adjustment for confounders such as APOE genotype and vascular co-morbidities.
Cited by
- supports Type 2 diabetes is associated with an increased risk of developing Alzheimer's disease.