pigrabbitbear writes: "As calorie counters and fitness fanatics have been demanding that we all eat right and exercise, scientists have been working on a different theory behind obesity, a bacterial one. How our bodies make and store fat, they hypothesized, could be affected by the bacteria that naturally exists in our digestive tracts. It's a plausible enough idea. If bacteria can cause other kinds of health conditions, it could be capable of causing obesity. A new study from China provides convincing evidence that this is exactly what's going on. It might show us the way to a cure, too."