sciencehabit writes "Gastric bypass surgery is supposed to work by shrinking the size of the stomach, leading to rapid weight loss. But a new study reveals that the procedure changes the population of microbes in our guts, and that these microbes themselves may be helping us lose weight. When researchers transfered microbes from mice that had undergone gastric bypass to mice that hadn't, the recipeint mice loss 5% of their body weight in two weeks. No surgery required."
Link to Original Source