Of course the school system could suggest that they opt out of the USDA/DoE/Stassi surplus comodities program and start letting the kids brownbag it or get something from the food truck parked at the cafeteria's side door.
I realize that doing so would mean the loss of one deputy superintendant, two surplus commodities purchase specialists, several warehouse persons, and the fleet of trucks needed to haul all that welfare cheese around.
When the former daughter got to high school they had hot dogs and burgers (plus fries and a can of soda) as the main choice, plus whatever the culinary class on school release from the "local" juvie center dreamed up. (Which, btw, was usually pretty good.) If kids did not want what was in the cafeteria they were allowed out - within a 6 block radius (walking only, no cars) - to hit the local resteraunts. The joys of a very urban school for highly gifted/weird kids.
stay safe.