These drugs are turning into a band-aid on the fact that it's more profitable to sell addictive, high-calorie foods in the US than foods that promote long-term health.
We'll decay people's heart muscles before we put a tax on unhealthy food to help fund Medicare and Medicaid.
The food is most of it, but it also doesn't help that our environments and society don't allow for as much mobility and exercise as our bodies evolved to expect. You can't force people to sit in a chair for 8-10+ hours a day staring at screens and then be surprised when a bunch of them are unhealthy. It's more profitable if you ignore people's health and keep them in place and working on task without interruption though so here we are.