Dairy In Your Diet

In an attempt to get my son to eat better, I have been sneaking a string cheese into his lunch every day.  Every day he brings home the lunch and all that's left in there is part of that string cheese.  The PB&J is gone, the cookies gone, the chips gone.  I don't ask for much people, just please eat that cheese.  Let's try to get some dairy into your diet.

I bring it up to him this morning (and yes as he was eating goldfish crackers for his breakfast).

"Logan, why can't you eat your cheese.  I want you to get some dairy in your diet.  I don't ask for much, but I ask you to eat this teeny tiny thing"

"Mom, I don't know why you are so worried (as he is pointing to the package of his goldfish).  Look this says it's made with real cheese.  I don't need to eat my cheese stick."

Why do I bother!?