By Caroline Cox

Many parents cheered about 10 years ago when Michelle Obama took on the important task of improving school meals. Of course, every child should have a healthy lunch and breakfast. Most of us have school cafeteria stories; I still remember the feeling of failure I had decades ago when I realized my daughters never had time to eat more than their dessert before joining the stampede for recess.

Ms. Obama's work—and the work of many other concerned parents, teachers and staff—sparked significant improvements in school menus, some of which are now being undone by the current administration (allowing children to eat food with more salt and less whole grain). Schools must once again take another step forward.