Something I distinctly remember from my time at my public high school in North Carolina was being very hungry for the second half of the day. This was because school lunches served small portions of distasteful food. The picture above is one my brother sent me of his lunch the other day. He spends seven hours at school and three hours on the bus, and during these ten hours, this is the only food he gets.
This is one of the principle differences I noticed when I switched from the French school system to the American school system. In France, we had a balanced meal with protein, vegetables, fruit, a dairy product, and bread and all in reasonable portions for growing teenagers.
Nutrition is critical to physical well-being, and schools are setting a poor example of a balanced diet. If we invest into providing decent lunches to public school students, we are sure to improve their health and likely their ability to learn effectively.