The latter may be a bigger problem for some than the former. Kids probably don't notice the 'unhealthy' aspect, but will surely suffer from how others treat them.

My mom was a chubby kid and told me she did everything within her power to protect me from having to go through what she did. As it turned out, I was a really skinny kid whom she had to coax to eat anything. Then, something changed near puberty, and I've had a constant battle with fat ever since. Most of my life, this has been fat related to body image, but now that I'm older, it's easier to gain more and it has affected my health.

That said, I don't think there's anything that could have been done differently when I was a kid. I don't feel that education will help kids that likely know what healthy food is anyway. I think making the convenience foods less convenient will. Yank the junk food and soda machines out. Speaking as a former kid, if I could get it, I'd eat it.