Many people assume hunger disappears once they feel full, but the brain may continue responding to food cues even after satiety. New research published in the journal Appetite suggests that images of food can still activate reward signals in the brain, potentially explaining why people sometimes continue eating even when they are no longer hungry.
In the study, researchers used EEG brain recordings to track how participants responded to food images before and after eating to satiety. While participants reported feeling full and rated the food as less appealing afterward, their brain’s reward-related signals remained active when exposed to the same food cues.
This suggests that learned responses to food — such as repeated exposure to images, advertisements or familiar eating environments — may continue to stimulate the brain’s reward system even when the body’s energy needs have already been met.
Researchers say this disconnect between satiety signals and brain reward responses may help explain overeating in modern environments saturated with food cues. While hormones like ghrelin trigger hunger and leptin signals fullness, external stimuli such as advertisements, social cues and visual exposure to food may override these signals, prompting people to eat out of habit rather than true hunger.
SOURCE:
News Medical, March 4, 2026