Really now? Make food healthier? Give me a break.
No matter what you do, kids make a choice. You can throw a bag of carrots in font of them and they will refuse to eat it and wait a good hour to get something they desire. When did the schools become the food police? Give kids a choice but don't force them. Who knows, maybe they ONLY eat fruits and healthy choices at home and when they get to school, they get to spoil themselves a bit.
Don't buy the junk at home? How is that going to help? Most kids have friends and some of those friends most likely have junk food. Once you start limiting someone to something they like, they'll just find alternative ways to get what they want.
Here's the better question: Would you rather spend more money on "healthy" food and then waste money on that by kids bringing in the junk they want, or just leave the lunches as they are now and spend more money on what really matters: an education.

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