[msarvar]

So they basically put him on a strict low calorie diet, and he lost weight? No way!

[aantix]

Please stop oversimplifying. With the existence of the bacteria, mice were obese. By means of their diet and prebiotics, they were able to reduce the levels of this bacteria in their subject.

Could be just the caloric deficit, could be the bacteria. It's an interesting correlation and should be explored further.