Schools that participate in the government-subsidized lunch and breakfast programs next school year won't be able to serve whole milk and must offer nonfat milk.

WSJ: School Lunches to Become Healthier

Milk may have been adjusted by separating part of the milk fat therefrom, or by adding thereto cream, dry whole milk, skim milk, or nonfat dry milk.

FORBES: Why Milk Isn't As "Natural" As You Think

Foodmakers then became very interested in whey as a cheap alternative to nonfat dry milk.

FORBES: Making Whey

Flavored milk will only be allowed if it is nonfat.

WSJ: School Lunches to Become Healthier