There are some good points in here about NAFLD. It's worth pointing out that (i) high sucrose (and/or fructose) intake makes it hard for people to self regulate appetite (i.e. not overeat). And (ii) the above stated ill effects of high sugar consumption are basically stopped in the presence of a caloric deficit -- e.g. IIRC there are controlled chimp studies on this and inadvertent human 'experiments' like with food shortages in Cuba in the 90s. But I don't think (ii) is particularly relevant for rich countries whereas (i) is.

>This is not about self-discipline, it is about public policy.

it can be instructive to compare school lunches in the US vs other rich countries. Not everyone serves highly processed junk food for lunch.