In Pic :The smaller mouse, right, lost weight after gastric bypass surgery, while the heavier ones, left, had “sham” operations. The bacterial makeup of the intestines may help determine whether people gain weight or lose it, according to two new studies, one in humans and one in mice. The research also suggests that a popular weight-loss operation, gastric bypass, which shrinks the stomach and rearranges the intestines, seems to work […]