The problem is that you can't undo millennia of evolution that has pushed us towards the situation where people are obsessed with food and struggle to limit themselves. We also shouldn't forget that not more than a century ago famine and rationing was still commonplace. Certainly my parents were still raised in an environment that hadn't gotten used to food being plentiful and were always forced to eat everything they had at all times and rewarded with food, this has been engrained in myself since I was young as well. I'm lucky that I managed to move away and isolate myself and lose a lot of weight but the important thing to note is that once I got down to a lower weight, everything was easier, getting up in the morning, walking, jogging, working out, talking to people, going outside. Now I've probably gained back 30% of what I lost and if I could take Ozempic to lose 5kg the rest would come a lot quicker because I'd be able to run further and have more energy generally.

All that is to say, these two are not mutually exclusive and if people receive this drug everything we already do to promote a healthy lifestyle will become much more realistic for many people, as far as I understand Ozempic removes the desire of hunger, it's not like people can continue their bad habits and take the drug and lose weight. Furthermore once they assume these habits, the generational cycle of raising children and over indulging will likely come to an end and we will probably not need the drugs as much.

TL;DR, people want to be healthy, they just don't have the tools or motivation to do it. Losing weight will likely be a gateway to many health improvements and benefits for future generations