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The "massive weight changes" from stool transplants are most often weight loss, to my knowledge.

If so, this would be consistent with increased biodiversity (from the stool transplant) correlating with reduced visceral fat.

At any rate, the interaction is probably more complex than our current understanding, as this is a very new area of research.

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It works both ways, but once people doing FMT realized that transplanting feces from an obese person to a thin person makes the thin person gain weight, they stopped doing that. All of the stool banks now screen for obesity and won't accept donors with high BMI. So now you should only see weight loss after FMT, or no significant change.

That is very interesting.

Can you provide any links for this FMT screening process?

Sure, here's one: http://www.openbiome.org/stool-donation/

$40 per stool. Nice.

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