That's actually not accurate. From what's documented about that trial, every participant regardless of which group they landed in received structured lifestyle counseling matching current weight management guidelines. Everyone worked with a dietitian or similarly qualified professional throughout, aiming for a meaningful daily calorie deficit through a mix of eating less and moving more.
That's a pretty important detail when reading into the results. The dramatic percentage losses reported came from pairing the medication with genuine, professionally guided changes to diet and activity, the drug wasn't doing all the work solo. Both the medication group and the comparison group got that same lifestyle support, which keeps the comparison fair, but it also means those numbers don't translate directly to someone taking the medication alone with zero behavior changes.
For the related follow-up study comparing two different medications head to head, both arms followed the same structured behavior support program for the full study length, so that comparison was really measuring drug effectiveness layered on top of an identical lifestyle foundation for both groups.