Crohn's can definitely take a toll on one's body and mind. My 21 year old daughter was diagnosed at 17. Since her diagnosis there have been ups, downs, surgeries, obstacles...the weight doesn't surprise me. My daughter had to be put on a liquid diet 2x now. The first time she went from being 143 lbs (she's 5'11") down to 112. The second time it was due to having 18" of small intestine removed and having an ostomy bag for 7 months. She also was told by her GI specialist that she needed to defer a semester from college...which ultimately turned into 2 semesters.
All that being said, watching it happen to your child makes you feel helpless. I can't even imagine having to actually physically experience it. I hope he is found safe and well! This disease is known to cause major depression, especially at that age. I'm keeping my fingers crossed for him and his family.
And to anyone on here that knows him, there are so many online forums that he can find to chat with people going through the same sort of issues. They really helped my daughter. In fact, if all goes well with this case, if interested, feel free to PM me and I can provide some online support info and my daughter would even be willing to be an ear whether he want to text, email, whatever. She's been there. She still struggles. She has a home health nurse who comes to our house every 4 weeks to give her remicade infusions. I truly feel for him amd his family...many many prayers!!!