Our daughter had her total colectomy in 2009, and still has to stick with a very limited diet (potatoes, rice, tofu, white breads). Her weight is very low, and the doctor wants her to gain weight, but it's almost impossible. On occasion, she will try eating vegetables and fruit but it always causes cramps and even more frequent trips to the bathroom.
We would love to hear how your son eats, and manages to be so active and healthy!
Please give us your son's web site, if he still has it.