The only diet that has been developed specifically for persons with IBD and autoimmune disorder by medical professionals is the UMass IBD-AID diet, which derives from the SCD diet:
https://www.umassmed.edu/nutrition/ibd/ibdaid
As noted by Scott F earlier in the thread, any diet is going to work well or not on a trial and error basis, and there is no such thing as general acceptability among any population with any diet. In the past I was in IBD support groups with persons who tried vegetarian diets that failed, either because the person was unable to maintain their weight or their iron levels or digestive issues, whereas others did OK with such diets. Similarly, with carnivore diets, persons who have sodium restrictions or problems with high blood pressure could be bringing on hypertension or heart attacks, whereas others can eat high salt diets and maintain normal blood pressure readings. The American Heart Association recommends that we consume no more than one teaspoon of salt a day- 2300 ml:
https://www.heart.org/en/healt...should-i-eat-per-day
If your blood pressures run over 140/90 and you start eating a diet like this, salt consumption will go up and you could be embarking on a dangerous path. At a minimum, get a blood pressure gauge and check it twice a day. You do not want to start focusing on one diet that improves your bowel health while simultaneously sabotaging your cardiovascular health. Consider general health and well-being as well as bowel health, because as you age blood pressures will creep up and hypertension and blood pressure pills may all of a sudden become part of your life. The number of medical records I read of persons over age 50 that have hypertension is kind of out of control. The average American consumes 3400 ml of salt a day, which is around 33% more than what is recommended by the AHA. And once you hit 50, the blood pressure will start creeping up no matter what, so you really need to be watchful of it.