WASHINGTON (AP) — First lady Michelle Obama is striking back at House Republicans who are trying to weaken healthier school meal standards, saying any effort to roll back the guidelines is “unacceptable.”

The rules set by Congress and the administration over the last several years require more fruits, vegetables and whole grains in the lunch line and set limits on sodium, sugar and fat. The first lady met Tuesday with school nutrition officials who said the guidelines are working in their schools.