At a risk of being ignorant: Isn’t obesity a function of calories intake and calories burn rate? If so, why do we even need a drug for that? What should a possible drug target here? Assuming no changes in behaviour and thus a continued steady daily caloric surplus, would it even work?
I wonder if rather than a placebo they had a control group also try to lose with caloric restriction and defined plateaus where they maintain a weight for some period of time. For example instead of lose 1lb/week for 52 weeks, lose 1lb/week for 12 weeks, maintain weight for 8 weeks, repeat. Maybe the element of the body "remembering" a weight happens when you plateau at a weight for a while? Kinda like giving the body some time to adjust as you lose.