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For asult: In answer to your original question, "Why haven't double-blind, peer-reviewed studies of SCD been done as a treatment of Crohn's?"  an experimental diet, where the the subjects were given a list of allowed foods, vs. prohibited foods, and instructed not to deter in any way from their particular list, would be a nearly impossible, if not impossible, research study to conduct as a double-blind study.   While the researchers might not know who was assigned to the experimental groups (the SCD group, vs. the group put on say, ASA treatment) vs. the control group (the group allowed to continue eating their "normal" diets), the two diet groups would easily know what groups they were assigned to.   At least, I can't see a practical way to double-blind a study for this question. Other methods would need to be used.