I really think that they should make school dinners compulsory. Two choices, both healthy and balanced, preferably seasonal, even better if it can be local or grown/raised/cooked by the kids themselves. One of the options could be vegetarian/vegan, but any other dietary requirements would have to be proven by a doctors note or religious requirements. The kids would kick off at first, but they would soon have to learn to eat what they are given. It would stop parents sending a packet of biscuits for lunch (my sister is a teacher and sees all sorts of ridiculous packed lunches sent by parents who obviously don't care) and would teach kids to try new foods. They would most probably end up healthier as well.