There's a lot to "relearn" when it comes to dieting. It's too bad that it mostly falls on the person eating to prepare their own meals. If they could just not think about all of that shit, and just eat, then they'd lose weight in no time (I mean, if they had a nutritious cook at home, or if the supply side of the food industry was safer, as a rule).
The other part of the equation is getting some exercise. That's a no brainer. If you're not doing it, it's your fault. I say this when it comes to myself too btw. I enjoy being lazy. But we all need at least walk more. It doesn't take much.