Sustained energy equilibrium is a state of metabolic balance where the energy derived from food intake precisely matches the total energy expenditure over a prolonged period, resulting in a stable body weight and composition. Critically, this equilibrium is achieved without relying on extreme caloric restriction or unsustainable dietary practices, allowing for consistent high-level physical and cognitive function. It represents a metabolically flexible state where the body efficiently switches between fuel sources.
Origin
The term is a refinement of the basic principle of energy balance in thermodynamics, applied to the context of chronic human metabolism and wellness. Sustained emphasizes the long-term, homeostatic nature of the balance, and equilibrium highlights the stability of the energy stores. It is a clinical goal for patients seeking long-term weight management and optimal metabolic health.
Mechanism
The mechanism is governed by the hypothalamic control of appetite and satiety, mediated by regulatory hormones such as leptin and ghrelin, which are appropriately sensitive to energy stores. A state of equilibrium implies low levels of chronic metabolic stress, which prevents the dysregulation of thyroid and cortisol hormones that can impair basal metabolic rate. Furthermore, high metabolic flexibility allows the body to efficiently utilize fatty acids for energy, thereby maintaining stable blood glucose and avoiding energy dips.
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