Hormonal
In healthy elderly individuals, age-associated deterioration in glucose tolerance is driven by decreased insulin secretion and action, where the severity of insulin resistance is determined by body fatness rather than chronological age itself.
For older adults, maintaining low visceral fat and high aerobic fitness is more critical for glucose tolerance than chronological age. While beta-cell function declines with age, managing body composition can mitigate insulin resistance. Focus on preserving muscle mass and reducing visceral adiposity rather than accepting metabolic decline as inevitable.
We conclude that the deterioration in glucose tolerance that occurs in healthy elderly subjects is due to a decrease in both insulin secretion and action with the severity of the defect in insulin action being explained by the degree of fatness rather than age per se.
Why this rating
Large sample size (67 elderly, 21 young), rigorous methodology (minimal models, IVGTT, mixed meals), and multivariate analysis controlling for confounders.
Source
Mechanisms of the Age-Associated Deterioration in Glucose Tolerance
Rita Basu et al. · Diabetes · 2003
DOI 10.2337/diabetes.52.7.1738
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