I worked for a school last year and was amazed by how much sugar we fed the kids. For instance, the chocolate milk was fat-free but pumped up with a full 5 teaspoons of sugar to make it palatable, and most kids drank a carton at breakfast (to wash down their funnel cakes or French toast sticks ... blargh) then another at lunch.

Pumping them full of sugar twice during the school day then expecting them to sit still and work quietly is a recipe for disaster IMO.