One resource you might find helpful when trying to communicate with kids about the problems with high intakes of sugars and starchy foods is the movie Fat Head, by Tom Naughton. Click to go to his web site and read more about this movie.
In an interview, Tom describes that he hears comments from parents that their kids have really been able to relate to the movie. The interview is also interesting as Tom relates his own experiences with low-carb living and how this has evolved over time for him. The comments about kids and the Fat Head movie are in the last few minutes (24 min interview). Tom’s next project is a book for kids, with accompanying DVD. The interview is at NEquals1Health.com Link