I had no idea.     Thank goodness CNN is there to help us understand:

COSTELLO: That was Mrs. Obama back in 2010 when she signed the Healthy Hunger Free Kids Act into law. Well now some members of Congress and the food industry want to roll back that initiative and loosen requirements to cut costs. Today the First Lady takes the unusual step of delivering White House remarks speaking out against that House measure and in another twist, a one-time ally of Mrs. Obama’s initiative is now a critic.