> I have no trouble at all accepting this

That's not how science works. If something is proven and reproducible via the scientific method, it must work(used to make verifiable predictions) whether you accept it or not.

Let's never forget https://en.wikipedia.org/wiki/Diederik_Stapel . His M.O. was to fabricate results that would be easy for his peers to accept.

And if we take into account all the dangerous pseudo-scientific hype around the gut(leaky gut, cleansings, etc) we should be twice as careful.