"I'm just not hungry the way I used to be" is one of the first things people say on a GLP-1 — but that single sentence is actually describing three different things happening at once. Suppression, satiation, and satiety each change your relationship with food in a distinct way, at a different point in the eating process. Knowing which is which makes it easier to tell what's normal and how to eat well while it's happening.
Suppression, satiation, and satiety: what's the difference?
If you're on a GLP-1 medication, you've probably noticed your relationship with food has changed — meals feel different, hunger shows up less often, and "enough" arrives sooner than it used to. These effects come from three related but distinct mechanisms: appetite suppression, satiation, and satiety. Understanding the difference can help you recognize what's normal, what's worth mentioning to your provider, and how to eat well while on treatment.
Appetite suppression
Appetite suppression is a reduction in the drive to eat in the first place. GLP-1 receptor agonists act on areas of the brain (including the hypothalamus and brainstem) that regulate hunger signaling, slowing gastric emptying and dampening the reward and hunger cues that normally prompt you to seek out food. According to PubMed, mouse studies have mapped a hypothalamic circuit through which liraglutide quiets the hunger-driving AgRP neurons (Webster et al., Nature Metabolism, 2024, DOI (external link)), and shown that dampens the dopamine neurons that drive eating for pleasure — an effect that can weaken with repeated dosing (Zhu et al., , 2025, ).