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Dementia Risk in Type 1 and 2 Diabetes: A Nationwide Population-Based Comparison.

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Diabetes significantly increases dementia risk, especially type 1 diabetes (T1DM) and insulin-treated type 2 diabetes (T2DM). Insulin-requiring diabetes is a high-risk phenotype for cognitive decline.

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Area of Science:

  • Neurology
  • Endocrinology
  • Public Health

Background:

  • Diabetes mellitus is a growing concern for cognitive health.
  • The risk of dementia varies significantly based on diabetes type and treatment intensity.

Purpose of the Study:

  • To compare dementia risk across different diabetes types and treatment strategies.
  • To investigate the association between diabetes and all-cause dementia, Alzheimer's disease (AD), and vascular dementia (VaD).

Main Methods:

  • A population-based retrospective cohort study using Korean National Health Insurance Service data (2013-2024).
  • Included over 1.3 million adults aged ≥40 without prior dementia, categorized by diabetes status (non-diabetic, T2DM with oral hypoglycemic agents, T2DM with insulin, T1DM).
  • Used Cox proportional hazards models to analyze dementia risk, adjusting for various factors.

Main Results:

  • Dementia incidence was substantially higher in diabetic groups compared to non-diabetic individuals.
  • Adjusted hazard ratios for all-cause dementia were 1.29 for T2DM with OHA, 2.14 for T2DM with insulin, and 2.35 for T1DM.
  • Individuals with T1DM and insulin-treated T2DM exhibited the highest dementia risk, with similar risk levels between these two groups.

Conclusions:

  • Diabetes is linked to an elevated risk of dementia, particularly T1DM and insulin-treated T2DM.
  • Insulin-requiring diabetes represents a high-risk phenotype for cognitive decline.
  • Recommends proactive cognitive screening and optimized glycemic management, including continuous glucose monitoring, to mitigate dementia risk in vulnerable populations.