Cutting back on ready-to-eat meals won't be easy, and whole milk may make a comeback. One thing that's certain: It'll be a while before the new guidelines trickle down to schools.

The Iowa City Community School District is navigating changes to the food pyramid by U.S. Secretary of Health Robert F. Kennedy Jr., with an inversion of the pyramid emphasizing protein-filled diets.

Schools are imposing new nutrition guidelines and reinstating the Presidential Fitness Test as they adjust to the “Make ...