What really lives in your lower intestine?


I surprised myself by really enjoying Gut by Giulia Enders. I’m generally fairly squeamish about all things medical but I I’m glad I picked this one up. It’s full of interesting stuff from the emerging science of our digestive systems. There are some great sections about what actually happens in all the processes we don’t like to talk about and Enders has a lovely turn of phrase, writing that the movements involved in burping or breaking wind “are as delicate and complex as those of a ballerina”.

Gut bacteria are such an interesting area and we barely understand anything that goes on in there. For a long while we thought that there were very few types of bacteria but it turned out that there were many other types but they just didn’t survive when they were cultured outside the body. We’ve probably still only just started to scratch the surface of the types of creatures that are in there and we know even less what they do.

Gut science has also taught us a bit about human history. By looking at the strain of Helicobacter Pylori in our stomachs we can see where people in particular countries came from. So when the strain in the stomachs of pacific islanders was found to be the same as those from latin america it proved that they’d come that way round. The scientists who proved that there was a bug capable of living in stomach acid did so by drinking the stomach contents people with ulcers and making themselves ill. They won the Nobel prize for medicine 20 years later.

One of the lovely things about the book is Ender’s absolute fascination with her subject. She’s a young doctor who has specialised in gut research but she writes so well (and not without humour). The book was written in German so some credit should go to the translator as well because it’s a fantastic read.

We focus so much on heart health and brain health but actually gut health is just as important. There’s pretty good evidence that it can be linked to depression, heart disease and many other things. I think we’ll see it develop as an area pretty rapidly over the next few years as the tools to decode the composition of the bacteria and other critters in our intestines start to be understood.

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