There's no magic words or pills that a doctor can give someone to solve this problem - it cant be outsourced.
[1] - https://www.youtube.com/watch?v=5LTWJOi3bCo [video]
All the consumer warnings in the world won't solve the problem.
I agree, warnings will solve nothing. We've had warnings for a long time. I would expect more drastic measures like presidential executive orders of eminent domain like those used to seize steel mills during WWII. Companies making unhealthy things could become government property and liquidated, maybe. How to get people to not be sedentary? No idea. Draft everyone and put em in boot camp I guess? Half kidding, but I don't know what we can do. Maybe someone will create a virus that targets people with preexisting issues like diabetes and heart disease to wipe the financial burden/liability. Or perhaps a new VR MMO that gets everyone addicted to it and people have to move around a lot, funded using the defense budget. Oh and this system is required to renew your government ID or drivers license. All government offices become "remote only" so everyone needs one. Internet LTE modem built in.
The only solution I think would work is both very simple and very hard.
Convince people that they are responsible for their health behaviors, and have the power to change them if they want.
This is a very heavy lift because most people have been indoctrinated to believe that they are powerless to enact change, and purely products of their environment. This is reinforced by a host of organizations that profit or gain power by people believing this.
Doctors, therapists, governments and others can help people make changes, but can't do it for them. People need to take responsibility for their problems and implementing solutions in order for any help to be effective.