I didn't eat much breakfast or lunch for much of high school. I'd have a poptart for breakfast. My mom would give me enough money for lunch. I would buy a peanut butter bar and a chocolate shake and save the rest for shopping. It sounds awful, but it's true. I don't think there was anything my parents could have done to change it. I think you've got to focus on making the meal they do eat nutritious and something they will eat.