Metabolic Health
topic
Sleep deprivation impairs metabolic health through mechanisms including: reduced insulin sensitivity (cells become less responsive to insulin, requiring higher insulin secretion to achieve glucose uptake), elevated cortisol and growth hormone dysregulation (producing increased hepatic glucose output), altered adipokine signaling, preferential breakdown of lean mass rather than fat during energy deficit, and the hormonal changes (elevated ghrelin, reduced leptin) that increase appetite and preference for calorie-dense foods — collectively producing a metabolic profile in chronic partial sleep restriction that resembles early-stage type 2 diabetes.
Role
The metabolic consequences of sleep deprivation provide a biological mechanism for a significant portion of the global type 2 diabetes and obesity epidemic that has developed concurrently with the reduction in average sleep duration over the past 50 years. This correlation is not proof of causation but is supported by experimental evidence showing rapid, reversible induction of insulin resistance by sleep restriction in controlled settings. The person who is managing metabolic health through diet and exercise while chronically underslept is managing two of the three primary levers while ignoring the third — and experiencing the predictable frustration of incomplete results from an otherwise sound approach.