Putting PE and recess back in the school day would be better.
Bingo! When I was in school I always ate in the cafeteria, had meat, potatoes or hamburgers, etc., at break we could purchase nice home-made pasteries, we could buy cokes, etc. I was skinny as a rail as were most of my friends; what was different? PE plus a lot of us walked to school v taking school buses or being dropped off by a parent.