I’ll have to look that diet up. I was on the SCD diet for a very long time, but it didn’t help that much; and that was a very limited diet ( no gluten, but also no grains of any kind, no dairy, and lots of other ‘nos’ too. Very limited.)
I wish your son all the best. It is a very difficult thing indeed to not be able to eat without pain and problems.

I am also following the SCD diet for suspected SIBO but one of the suspected diagnoses that has not been ruled out for me is collagenous or microscopic colitis, which will have to be done through colonoscopy if my symptoms don’t improve through antibiotics and diet. I have gas, bloating, pain and loose stools more often than diarrhea. Have also lost 20 pounds and I am finally working with a nutritionist. Only reason the GI doctor has not rushed to do a colonoscopy is that I am 63 and have had two normal colonoscopies and the last one two years ago. I am following reduced and specific carb diet which has helped with pain gas and bloating. Only been on diet for a month but I think it helps. Very careful with what I eat and how to introduce new foods. Takes a long time and many tests plus trial and error to arrive at correct diagnosis. But I think SCD diet is worth a try for about three months to see if it works. I also have occult blood in stool. No visible blood.

Wendy I am curious if besides the diet your son has taken any meds for CC that help and have you tried the elemental shakes for weight gain?