Extremes in HbA1c Levels Linked to Dementia Risk: Dementia risks increased when HbA1c values reached 12% and higher and when they fell below 5%.

CHICAGO — Excessively high and extremely low levels of glycosylated hemoglobin were associated with an increased risk for dementia in elderly patients with type 2 diabetes, according to the findings of a cohort study involving more than 22,000 patients.