in part because no influential industry or institution has anywhere near enough incentive to encourage or facilitate prevention/mitigation of such conditions.

The food industry certainly doesn't. To the contrary, that industry takes full advantage of the fact that most people what to buy food that is as quick, easy, shelf-stable, and tasty as possible for the least amount of money as possible. Hence, a ubiquitous supply of ultra-processed, fiber-less, sugar-laden food. As long as that's what people want to buy, that's what they'll continue to sell.

The medical/pharmaceutical industry doesn't either. When it comes to chronic diseases, their whole business model is built on treating the symptoms of those diseases as opposed to addressing their underlying causes. And while I certainly don't believe the industry actively encourages people to get sick, the fact of the matter is that the industry makes a lot more money selling pharmaceuticals and procedures to sick people than it does helping prevent such sickness in the first place.

The bottom line is that when it comes to your health, there ain't no one out there looking out for you. So it behooves you to take personal responsibility for it.

(FWIW, the same can be said for personal finance).