The effectiveness of "health education" is somewhere between extraordinarily modest and nonexistent. It's not that people don't know what's healthy, it's that when it comes time to resist compulsion that is difficult, uncomfortable, and undesirable.
> [...] along with the lack of health education in schools.
I don't think that's too much of a factor?
I mean, check how much (or rather how little) people learn of the stuff that _is_ covered in school. Tweaking the curriculum would just mean that instead of not paying attention in algebra, students would not pay attention in 'health education class'.
In my school there was a strong emphasis on what a healthy diet is baked into the curriculum. Along with my family's relatively healthy cooking, that set me up for cooking and eating well on my own through college and life after that. I would edge away from takes related to "it just wouldn't work"
I mean the education system is its own mess for other reasons, but it's not a complete failure