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Diabetes, Edentulism, and Cognitive Decline: A 12-Year Prospective Analysis.

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The combination of diabetes mellitus (DM) and edentulism (tooth loss) significantly worsens cognitive function and accelerates cognitive decline in older adults, particularly those aged 65-74. This highlights a critical link between oral health, metabolic conditions, and brain health.

Keywords:
cohort studiesdental healthepidemiologygerontologyoral-systemic disease(s)public health

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Area of Science:

  • Gerontology and Geriatric Medicine
  • Neuroscience and Neurology
  • Public Health and Epidemiology

Background:

  • Diabetes mellitus (DM) is a known risk factor for dementia.
  • Tooth loss (edentulism) is increasingly linked to cognitive impairment and dementia.
  • The combined impact of DM and edentulism on cognitive decline remains understudied.

Purpose of the Study:

  • To assess the effect of co-occurring DM and edentulism on cognitive decline in older adults.
  • To investigate if this effect varies across different age groups (65-74, 75-84, 85+).

Main Methods:

  • A 12-year longitudinal cohort study using data from the Health and Retirement Study (2006-2018).
  • Included 5,440 adults aged 65-74, 3,300 aged 75-84, and 1,208 aged 85+.
  • Linear mixed-effect regression models were used to analyze cognitive decline rates stratified by age.

Main Results:

  • Co-occurrence of DM and edentulism was associated with worse cognitive function in adults aged 65-74 and 75-84.
  • This combination accelerated cognitive decline rates in the 65-74 age group.
  • DM alone accelerated decline in 65-74 year olds; edentulism alone accelerated decline in 65-74 and 75-84 year olds.

Conclusions:

  • The co-occurrence of diabetes mellitus and edentulism significantly impairs cognitive function and hastens cognitive decline in older adults, especially those aged 65-74.
  • Both diabetes and edentulism as individual factors also contribute to accelerated cognitive decline in specific age groups.
  • Findings underscore the importance of managing both metabolic health and oral health for cognitive preservation in aging populations.