These are a group of endogenous signaling molecules, primarily peptides, that govern the complex physiological control of hunger, satiety, and energy homeostasis within the human body. They function as a crucial part of the neuroendocrine system, translating metabolic status into feeding behavior and energy expenditure signals. Clinical assessment of these hormones is essential for understanding and managing disorders related to weight and metabolic balance. Dysregulation in their signaling often contributes to chronic weight management challenges.
Origin
The concept stems from classical endocrinology, specifically the discovery of hormones like insulin, but gained modern prominence with the identification of key gut-brain peptides such as leptin and ghrelin. This field of study integrates gastroenterology, neuroscience, and endocrinology to map the intricate communication network governing energy intake. Understanding their origin in various organs, including the gastrointestinal tract and adipose tissue, provides essential therapeutic targets.
Mechanism
Appetite regulation is a delicate interplay involving orexigenic hormones, which stimulate appetite (e.g., ghrelin), and anorexigenic hormones, which induce satiety (e.g., leptin, PYY, GLP-1). These signals travel via the bloodstream to the hypothalamus in the brain, where they interact with specific neuronal circuits to adjust feeding drive and energy expenditure. Imbalances in this feedback loop, often seen in obesity or metabolic dysfunction, lead to dysregulated energy intake and storage, overriding conscious control.
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