School administrators also complained, saying set maximums on grains and meats are too limiting as they try to plan daily meals.

“This flexibility is being provided to allow more time for the development of products that fit within the new standards while granting schools additional weekly menu planning options to help ensure that children receive a wholesome, nutritious meal every day of the week,” Vilsack said in a letter to Sen. John Hoeven, R-N.D.

The new guidelines were intended to address increasing childhood obesity levels. They set limits on calories and salt and phase in whole grains. Schools must offer at least one vegetable or fruit per meal. The department also dictated how much of certain food groups could be served.