What Triggers Hunger? Understanding Ghrelin and Metabolic Signals

Hunger can be triggered by more than an empty stomach. The smell, sight or even thought of food can prompt the body to feel ready to eat. The stomach also releases ghrelin, a hormone that signals the brain to increase appetite. As time passes between meals, the body may draw on stored nutrients, and falling glucose levels can create hunger signals. The brain and liver help monitor the body’s fuel supply. The brain responds mainly to low glucose, while the liver monitors changes in both glucose and fat availability.

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