Colorado provides free breakfast and lunch to all students. We voted on this last year.
Many school districts have sourced-out food service to outside companies in order to save money and the headache of preparing and serving the meals. The outside companies are now responsible for that. When our district switched to their first outside company, it was all pre-packaged food that was heated and the students removed the packaging from their meal before they ate. The current company, Chartwells, at least removes the packaging before serving the meals to the students, haha.
The district I taught in was 90-100% free and reduced lunch depending on the school you were at. By moving to the private company, the private company was responsible for making sure the lunches met the federal requirements (even way before 2009) yet also were cost saving so that they could be reimbursed fully for the F&R costs.
My first 10 or so years of teaching and the years I was a student in the same district, all our lunches were homemade and we had tons of choices. Around 2000 or so, our food service managers were no longer allowed to have open salad bars/taco bars/potato bars etc because they were too expensive to be reimbursed from the federal programs. They also started limiting what homemade food could be served. They switched to the outside company in around 2005.
Each meal must have a protein, fruit/veggie, and milk or juice for those who cannot consume dairy.