Should schools forbid homemade lunches?

This question is inspired by this article.

Looks like a school district in the Chicago area is sick of kids bringing crap food for lunch, and has decided that they have to either eat the school’s cafeteria food or go hungry. To be fair, they’re improving the school lunch nutrition, and it’s probably healthier if the kid is used to bringing Twinkies and Coke from home. On the other hand, there are got to be parents in a dither, either because their homemade lunches are nutritionally superior, or they’re in a dither because “how dare you tell my family what we can or cannot eat!”

Do you think this will help with childhood health and obesity issues, or does the end fail to justify the means here?