Hunger & Satiety Signals
topic
Hunger and satiety regulation involves a complex hormonal system — ghrelin (the 'hunger hormone', rising before meals and falling after eating, with chronic sleep deprivation producing chronically elevated ghrelin), leptin (the 'satiety hormone', secreted by fat cells to signal adequate energy stores, with obesity producing leptin resistance analogous to insulin resistance), GLP-1 and PYY (gut hormones released post-meal that signal fullness and slow gastric emptying), and CCK (cholecystokinin, released in response to protein and fat, producing strong satiety) — collectively governing the homeostatic regulation of food intake.
Role
Hunger and satiety signal literacy transforms the experience of appetite from an amorphous subjective state into a comprehensible physiological process driven by specific, modifiable hormonal variables. The person who understands that ultra-processed foods are specifically engineered to produce weak GLP-1 and CCK satiety signaling (through rapid gastric emptying and low protein-fat content), while stimulating ghrelin production and activating dopamine reward pathways, is equipped to understand why those foods produce continuing hunger despite adequate caloric intake — and why the solution is dietary composition change rather than stronger willpower.