I should also mention that the inability to absorb carbs is often a cause of IBS, and hence SCD would directly address that condition. Those that cannot tolerate carbs would do well to follow SCD to improve their intestinal health. Those with IBD may also have IBS and not know it. If you do have IBS, then anything that inceases your diarrhea is obviously not going to help IBD symptoms.
Those with only IBD will do well to remove the bad foods.