You have a second brain in your gut.

Our own stomachs may be something of a dark mystery to most of us, but new research is revealing the surprising ways in which our guts exert control over our mood and appetite.

Not many of us get the chance to watch our own stomach's digestion in action.

But along with an audience at London's Science Museum, I recently watched live pictures from my own stomach as the porridge I had eaten for breakfast was churned, broken up, exposed to acid and then pushed out into my small intestine as a creamy mush called chyme. {Read on}