for him the real trick is keeping weight on during a flareup, we are experimenint with various things. an elemental diet has been used in UC so I suggested he try some Essential Amino Acids. no peptide bonds to break, immediately absorbed, and no fiber and fat, both of which are supposed to be no-nos during flareups.

anyway PM me and I can send you the protocol. it's not quite done but as long as you don't mind a work in progress