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Beta cell function declines with age in glucose tolerant Caucasians.

K C Chiu1, N P Lee, P Cohan

  • 1Division of Endocrinology, Diabetes and Hypertension, University of California, Los Angeles, School of Medicine, Los Angeles, California, USA. kchiu@mednet.ucla.edu

Clinical Endocrinology
|December 7, 2000
PubMed
Summary

Aging impairs beta cell function, crucial for type 2 diabetes risk. Insulin sensitivity remains unaffected by age, suggesting beta cell decline drives age-related glucose intolerance.

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Area of Science:

  • Endocrinology
  • Metabolic Health
  • Aging Research

Background:

  • Type 2 diabetes arises from impaired insulin sensitivity and beta cell function.
  • The impact of aging on these two key diabetes components is debated.
  • Understanding age-related changes is vital for predicting diabetes risk.

Purpose of the Study:

  • To investigate the independent effects of aging on insulin sensitivity and beta cell function.
  • To determine if age-related glucose intolerance is linked to reduced insulin sensitivity or beta cell dysfunction.

Main Methods:

  • A cross-sectional study of 149 healthy, glucose-tolerant Caucasians.
  • Insulin sensitivity (%S) and beta cell function (%B) were assessed using the homeostasis model assessment.
  • Regression analyses examined the relationship between age and metabolic parameters.

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Main Results:

  • Beta cell function (%B) significantly declined with age (P=0.008), decreasing by approximately 1% per year.
  • Insulin sensitivity (%S) showed no significant association with age (P=0.769).
  • Body mass index and diastolic blood pressure influenced %S, while age, waist-hip ratio, gender, and systolic blood pressure did not.

Conclusions:

  • Aging is associated with a decline in beta cell function, not insulin sensitivity.
  • The observed age-related decrease in beta cell function is a primary driver of impaired glucose tolerance.
  • These findings highlight the critical role of beta cell health in maintaining metabolic function throughout the lifespan.