What it means
Researchers sometimes separate two ideas. Satiation is what makes you stop eating during a meal. Satiety is how long you stay satisfied afterward. Both come from a mix of stomach stretch, gut hormones, blood sugar, brain reward signals and habit.
Gut hormones released after eating, including GLP-1, PYY and cholecystokinin, help signal fullness, while ghrelin tends to rise before meals. Studies suggest protein is among the most filling nutrients, and high-volume foods with fiber and water can help too, though results vary between people.
GLP-1 medicines strengthen satiety by acting on appetite centers in the brain and slowing stomach emptying. Many people feel full after much smaller portions.
A common tip on these medicines is to eat slowly and stop at the first sign of fullness. Eating past that point is a frequent trigger for nausea and reflux.
Why it matters
Stronger satiety is the main way GLP-1 medicines help people eat less without constant hunger.