K.G.
why don;t you try to go up to the daycare during lunch time until the situation resolves itself. You can't accept that he doesn't eat, that's healthy. You could try to just be present at lunch and get him to eat the daycare food first, if that doesn't work you'll have to prepare his lunches before school and see if he eats those. if he refuses to eat at the daycare after a week or so you need to talk to a Dr.