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    Suppose that the gut/brain axis is as important (in psychiatry) as the peer-reviewed literature seems to indicate. Why then isn't fecal transplantation an extremely famous and celebrated psychiatric treatment?

    If you read the peer-reviewed literature, you can see how important the gut/brain axis is in psychiatry. And as I understand it, fecal transplantation is a "nuclear option" for the gut/brain axis where you actually revamp the composition of the gut biota. The fecal-transplantation thing seems...