I hate to say it, but the parents have lost the battle for you before it even began. This is absolutely disgusting...that the parents would pack all that sugary junk for his snack!!! I am surprised the school hasn't said anything...I know my son's school has guidelines about what can be sent and they promote healthy lunches and snacks, don't allow chocolate or sugary treats, etc. If that is what he is eating for morning snack, there is no way you are going to get anywhere with lunch I am afraid. He is loaded full of sugar and junk and isn't likely to care if he misses lunch because he doesn't like what you are serving. How is his behaviour? Does he act out a lot, have trouble sitting still, etc? I would expect that kind of food to have en effect on behaviour as well as health Poor kid!!!