Enterotype
It is based on the ecosystem that is created in the human intestinal system by the bacteria that exists there. Peer Bork and scientists that worked with him said in the April 2011 issue of 'Nature' that they have found three enterotypes. They think that people can be classified into one of three groups based on the bacteria in their intestines. The enterotype of each person is set while the person is an infant. The enterotype affects how well a person can digest food or absorb drugs. Chimpanzees have enterotypes that look similar to human enterotypes.