Just blame my bacteria

An expanding waistline may have less to with what a person eats than what’s already inside, say microbiologists Jeffrey Gordon and Fredrik Backhed at the Washington University School of Medicine in Saint Louis. Variations in the population of bacteria living in the gut may explain why some people pack on extra pounds while others stay slim.

  -- Discover Magazine

So these guys had some mice. One bunch of mice had normal microbes, and the others were "bubble mice" -- they were in a germ-free bubble.
The bubble mice had less body fat than the free-range mice. When they started putting intestinal microbes into the bubble mice, the bubble mice porked up.

I'm thinking that if they can get a Listerine© that kills mouth bacteria, can they get one to kill the fat-enhancing intestinal bacteria?