As a millennial, we've been afraid of this scenario so long I think we can finally let it go.
(lemmy.dbzer0.com)
It's multiple factors. There is the cheap, ultra processed foods, but also when a doctor tells you to lose weight, they're likely to tell you to go on a diet and exercise, but without giving advice on what types of diet and exercise are most helpful. Even if they do refer you to a nutritionist, insurance likely won't cover it. Add misinformation and a culture of blaming people for their bad health to that mix and you end up with a recipe for disaster.