Genes are important, but diet may be even more important in determining the relative abundance of the hundreds of health-shaping bacterial species comprising an individual’s gut microbiota, according to UC San Francisco scientists whose latest mouse experiments to probe this nature-versus-nurture balance were published online December 18, 2014 in Cell Host and Microbe.

http://medicalxpress.com/news/2014-12-bacteria-gut-diet-genes.html