He will regain his weight, I know it's heart wrenching, I've watched 3 of my loved ones go thru this, so I've done a lot
of research. My son is 38 and had a
total colectomy at 12. He is an avid hiker where he is out in the middle of nowhere for weeks at a time, and there are no special foods out there, and he does just fine. He is a marathoner, untrathoner, mountain biker, and competes in jujitzu, so a good quality of life is very possible.