Seems like your issue seems to be with sending the wrong message to kids, so I'm going to go ahead and hijack this with a related beef of my own:
Has anyone seen the ad the govt are currently running to promote, sorry, "inform" people about the improvements to the education system? Has a kid, a teacher, a parent and a candlesti...I mean social worker on it. I saw it the other evening, and it occurred to me that all bar one of the half-dozen-plus people featured on the ad seem to be overweight, not drastically so, but a bit at least.
So on the topic of sending the wrong message to kids, are we becoming desensitised to the obseity problem that our society currently has? Is it now just 'normal' to be overweight, and is that the way we should be presenting our 'everyman'?
Oh, and genes, and stuff...