Sodium and Carb are just natural from cow, also some companies are rid of sodium or carb like Lactaid did rid of lactose and others are rid of sodium (like in Germany).
Few type of sodium can be added to prevent the taste or expands more fresh date.
Most elementary school in USA, Kids are require to drink milk and balanced meal like meat, vegetable, fruit, bread and dessert, also kids who is lactose intolerance then need have water/juice or special milk if school does offers. If kids don't like it then they can bring their lunchbox but soda are banned.
