Why we’re passengers in our own bodies, outnumbered by our resident bacteria. Professor John Cryan is interviewed by The Naked Scientist's Chris Smith.

'Apart from aiding digestion, and keeping bad bugs at bay, evidence is also emerging that our intestinal microbes can also affect our behaviour and even the way the brain develops'. Professor John Cryan Department of Anatomy and Neuroscience UCC, discusses his research with Chris Smith at The Naked Scientists. http://www.thenakedscientists.com/HTML/content/interviews/interview/1001127/. The interview was broadcast on BBC Cambridgeshire and BBC 5Live and ABC Australia.

Podcast of John Cryan's Interview is available on the front page of Naked Scientists webpage: http://nakedscientists.com/

Based at Cambridge University's Institute of Continuing Education (ICE), the Naked Scientists are a team of scientists, doctors and communicators whose passion is to help the general public to understand and engage with the worlds of science, technology and medicine. Launched in 2001, the Naked Scientists was one of the first podcasts to exist and is now one of the world's most popular science shows, achieving over 40 million programme downloads in the last 5 years.