My own reason was a gut that for years tolerated fewer and fewer things. I dealt with that by cutting out more and more, which narrowed my diet and not my symptoms. What finally helped was adding something: fibre, in small steps, over about four months.
What stayed with me is not that it worked, but where it had been sitting. Most of it had been in ordinary journals for years, free to read, and nobody was keeping it back. It fell between specialties and it was not firm enough to make anyone responsible for it.
I work these things out with AI alongside, which I mention because it says something about how this comes about. It reads through more studies in an afternoon than I manage in a month, and it asserts, with exactly the same confidence, things that turn out not to be true. So an entry in the reference list shows how far it was traced: in full, or without authors, or described only by what it found.
I have kept digging into the gut because it helped me so much. The second subject here is Parkinson’s, for my uncle, who has it.
For something already safe, cheap and freely available, I would rather not wait for a trial that may never happen. Anyone weighing that the other way round has just as good reasons.