I received an email from Nathan's 4k teacher, he stopped drinking the juice that the school provides at snack time. The rest of the kids get milk so Nathan gets juice. I wrote back to the teacher to find out what kind of juice they give him and it was orange juice. She said he used to get apple but they recently switched to orange. That explained it, he doesn't like orange juice.
She asked if I could send juice to school and I said "sure". I already send his own snack because he can't eat the snacks they provide. I am going to send Fruitables hoping that at least he will get some of his veggies that he needs since he is being a very picky eater lately.