Some kids need the extra calories in chocolate milk .Some kids need to gain weight and calories give you the energy you need.
If schools don’t serve chocolate milk most kids won't drink milk at all.If you go to any elementary school most kids would choose chocolate milk over regular milk and most schools at the end of the day serve more chocolate milk cartons then regular milk cartons.For example at this school for ever 1 carton of regular milk sold there were 6 cartons of chocolate milk sold (ABC news) Chocolate milk gives all the nutrients and vitamins