E is barely eating his lunch at school.

Today he had pretzels, string cheese, apple slices and 100% juice box. I open his lunch box. The juice was gone and some of the pretzels. He tells me what he wants each day and helps pack it. The past few mornings he has not been eating breakfast so by 11:40 or so he should be hungary. Today he did have a glass of chocolate milk. So for now on he will not have milk before school.
Any suggestions?