If a trial reports '15% weight loss', is that what I would lose?
Updated: 2026-09-09 · GLP-1 and weight
Short answer
No. That figure is a group average, and behind it sits a wide distribution: some people land well above it and others well below, including no change. Trials talk about responders and non-responders for exactly this reason. Participants were also selected by inclusion and exclusion criteria that may not match you.
In plain English
- An average summarises the group; it describes no individual participant.
- 'Responders' usually means those passing a threshold set in advance.
- Trials include support, monitoring and often structured lifestyle changes.
- Exclusion criteria — age, existing conditions, other medicines — limit who the result extends to.
What we know
- Trials report both averages and the share of participants reaching specific thresholds.
- Individual variability in response is consistently described for this drug class.
What we don't know yet
- There is no reliable way to predict in advance who will respond, or how much.
- Results outside trial conditions typically differ from published ones.