Refined carbohydrate-rich diet is associated with long-term risk of dementia and Alzheimer's disease in apolipoprotein E ε4 allele carriers.
Level 3 - non-randomized controlled study
Prospective cohort study with 12-year follow-up
PubMed 32506713 · doi:10.1002/alz.12114
What was done
The study evaluated 2,777 elderly participants from the French Three-City Study followed over a 12-year period. Refined carbohydrate intake was estimated by quantifying dietary glycemic load. Proportional hazards regression models were used to assess associations between glycemic load and incident dementia and Alzheimer's disease, as well as the interaction with APOE-ε4 carrier status, adjusting for potential confounders.
What was found
After adjustment for potential confounders, high afternoon-snack glycemic load was associated with increased dementia and Alzheimer's disease risk in APOE-ε4 carriers (hazard ratio = 1.27, 95% CI [1.03-1.56]). Numerical estimates for non-carriers or overall daily glycemic load were not reported in the abstract.
Why it matters
This paper provides long-term epidemiological evidence linking high glycemic load intake to elevated dementia risk specifically in genetically vulnerable APOE-ε4 carriers.
Limits
The observational design cannot establish causality and is subject to residual confounding. The finding was restricted to afternoon-snack glycemic load in APOE-ε4 carriers rather than total dietary glycemic load. The abstract does not report dietary measurement frequency or absolute event rates, and findings are from an elderly French population.
Cited by
- partial High-glycemic carbohydrates and wheat are associated with dementia and neurobehavioral disorders.