Yes, having mentioned them a scant couple of days ago the concept of encapsulated feces taken for intestinal flora thereapeutics is back in the news.
FMTs ... or fecal microbiota transplantations if you will are a mechanism by which corrective action may be taken for those of us with deficient microbes in our guts resulting in a variety of immune disorders and obesity among other things.
The research delves into the significance of BMI which I personally don't view as a relevant measure because it fails to take into account body composition so much as dimension.
You can have a high BMI and be quite lean, as I have been in the past. Not now, mind you — but back in "the day".
The recent U of Miami study leads us down that primrose path of improvements in the BMI post fecal consumption with the mechanism of course being the flora from people with normal BMIs which was encapsulated and given to the fatties in the study.
As for me, I personally believe in the science of cultivating a healthy intestinal flora with contributions from others. I simply don't think a BMI point or two one way or another is an accurate measurement of results. It's enough to turn one into a raging fecophiliac.