I've seen adverts in Europe warning against childhood obesity, and that's really where this needs to be tackled. They were particularly clever in focussing on behaviours, like educating adults on the amount of food children really need, rather than showing images of fat children. I've seen adverts in the US that depict fat children, which of course attracted a great deal of criticism. I'd actually agree that it's a delicate matter and one best handled by trying to change habits and not through stigmatising obesity. Children have little control here, so it's the parents that need to be reached. Barring a diagnosed medical reason, I think we should consider extreme childhood obesity and poor nutrition the same way we'd view a child being left unwashed and deprived of education. This is how we break the ham cycle passed down from parent to child and make it possible these children will live long enough to see their own grandchildren.