I'm often asked by my friends and colleagues where they can learn more about the microbiome. Here are a few excellent resources:

• Knight, R., Callewaert, C., Marotz, C., Hyde, E. R., Debelius, J. W., McDonald, D. et al. (2017). The microbiome and human biology. Annual review of genomics and human genetics, 18, 65-86.
• Khanna, S., & Tosh, P. K. (2014). A clinician’s primer on the role of the microbiome in human health and disease. Mayo Clin Proc, 89(1), 107-114.
• Lynch, S. V., & Pedersen, O. (2016). The Human Intestinal Microbiome in Health and Disease. New England Journal of Medicine, 375(24), 2369-2379.

If you're interested in non-scientific literature, a good place to start is the Coursera course: Gut Check: Exploring Your Microbiome. It's free.