Sure, but this is talking about existing symbiotic bacterial communities that already inhabit healthy lean people anyway. The idea is to just transplant these i

Sure, but this is talking about existing symbiotic bacterial communities that already inhabit healthy lean people anyway. The idea is to just transplant these into obese subjects and let them establish that same relationship in their new host. The title is misleading because we don't actually know whether it's the addition or subtraction of certain bacteria that produces the effects of obesity, just that the colonies are different.