> can "cure" brain tumour with painkillers too. That's the same thing - silencing symptoms, while the cause persists

Bad comparison. Taking painkillers doesn’t cause the underlying condition to go away. GLP-1 agonists do. The obesity goes away. The inflammation goes away. Hell, the dietary choices get changed. In some cases, including ones I’ve personally seen multiple times now, even after treatment is stopped.

> If they exercise, that's normal they gain weight. Muscles build up

They’re not gaining a persistent few pounds of muscle in a week that then get worked off with exercise.

The next few generations of humanity are going to be genuinely fascinating. One group with fewer and fewer transmissible diseases, without obesity, aging slower. The other anti-vax, anti-medicine and whatnot.