I don't do artifical either, but we are not GF. I send my son who is pretty picky, and I'm working on curing that! a snack and lunch daily. Things like PB&J and bananas or PB&J and honey. He likes ham with mayo. He likes pirate bootie and these brown rice chips I bought at costco. I slice strawberries and add a spinkle of sugar or fresh whip cream. I do pB&J on graham crackers, I make granola bars/bites.
I have a blog, I am not sure if I'm allowed to post it? But it's in my profile, the link that is. Maybe it will give you some ideas that would follow your sons diet!?
We do hummus and rice crackers or cakes, or other bean dips, hard boiled eggs, homebaking ranging from GF muffins, cookies, granola bars, power balls (pb or almond butter, with finely chopped dried fruit, maple syrup, seeds, choco chips), pirate booty and popcorn with flax oil and engivita yeast.