Ozempic's mechanism of action is not "ramp up your metabolism" or "make you absorb fewer calories from food." It's "make the desire to eat less intense, making it easier to remain on a diet plan." That diet plan could be, "eat exactly the same things but less of them," but it will often be, "cut out unhealthy snacks" or whatever.
If people can't be convinced to eat carrots over chips, what makes you think they're going to suddenly eat carrots over chips after eating medication that makes them want to eat less?
A lot of people struggle with intense cravings for foods that they know to be unhealthy. These cravings stack up against their willpower and sometimes overcome that willpower and they eat in ways that they know are unhealthy.
If the cravings are less intense, willpower wins more often, cravings win less often.
I think that you will indeed see that some people on ozempic eat much the same mix of foods as before, but less so. But others will in fact change their dietary mix. And I'm pretty sure that the empirical evidence supports me on this.
Yes N=2, small sample sizes, but I could also see how being less snacky makes one less likely to eat chips. (Why I almost pathologically don't keep easy to eat food in my pantry, granted this can also backfire too).
If you don't care much for food then you don't mind eating the carrots and you don't mind losing the chips. If your entire life is food, then you do mind.
I'm not sure what angle you are getting at. There is tons of data that shows that yes, people lose weight on it.