Oligadar I don't agree with your assumption that diet is a "cure" for UC, merely a viable peripheral treatment. I do agree with your conclusion:
It means that it will be very difficult to find out these problematic food component with classical approach (cohort, randomized, prospective studies) said...
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I have high hopes for fecal transplant treatments in some form being very effective for UC in the future, but I think it will have to be customized in ways we don't understand yet to have a high success rate. I am skeptical about a real cure for IBD like gene therapy, until medical science can pinpoint the specific genes associated with IBD.