This undated photo provided by the University of Colorado shows scientist Rob 

This undated photo provided by the University of Colorado shows scientist Rob Knight in his lab at the University of Colorado, Boulder, where he is leading the American Gut Project. The bacterial zoo inside your gut could look very different if you're a vegetarian or an Atkins dieter, a couch potato or an athlete, fat or thin. Now for a fee and a stool sample, the curious can find out just what's living in their intestines and help one of the hottest new fields in science.  (AP Photo/University of Colorado)
Associated Press
This undated photo provided by the University of Colorado shows scientist Rob Knight in his lab at the University of Colorado, Boulder, where he is leading the American Gut Project. The bacterial zoo inside your gut could look very different if you're a vegetarian or an Atkins dieter, a couch potato or an athlete, fat or thin. Now for a fee and a stool sample, the curious can find out just what's living in their intestines and help one of the hottest new fields in science. (AP Photo/University of Colorado)
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