Any LO's disaccharide free?

NCMichelle

My DS with SPD is being referred for an endoscopy with a GI specialist.  He's an extremely picky eater who is already on a milk-protein free diet.  He's significantly underweight.  Our pediatrician is recommending a disaccharide free diet.  This eliminates so many things that he eats - and he eats hardly nothing to begin with.  Anyone else disaccharide free?