Vermmy, any time you can get all that processed garbage out of their diet they will do better.
That really goes for any child.
Have you tried the gluten free/casein free diet on him?
That is suppose to work miracles for some kids, behavior wise and attention wise.
It really is fun to make stuff that you use to think you could only get if you bought it, you make almond butter and all kinds of stuff.
I make homemade yogurt and the kids get to add their favorite flavors and fruits to it.
I make my own jelly and jams too and avoid all the junk thats put in it, but with the jellies you can get the flavorings from the bakery or candy supply places and make all kinds of funky flavored jelly, rootbeer, cotten candy or butter rum jelly anyone? :)