Why Do We Get Hungry?

Hunger is regulated by a complex interplay of hormones and neural signals. When the stomach is empty, it releases the hormone ghrelin, which travels to the hypothalamus and stimulates appetite. Simultaneously, falling blood glucose levels activate hunger centres in the brain. After eating, the gut releases hormones like leptin, cholecystokinin, and peptide YY that signal satiety. The hypothalamus integrates all these signals to regulate when and how much we eat. Emotional and environmental cues — the sight and smell of food, stress, boredom — can also trigger hunger independently of metabolic need.