We are not alone. Each of us is teeming with bacteria and other microbes. From the soles of our feet to the follicles on our head — and every crevice in between — trillions of microbes form specialized ecosystems collectively known as our microbiota. The microbes that live on and in us outnumber our own cells by more than ten to one.
Far from being mere freeloaders, many of our microscopic passengers are essential residents — friendly bacteria that help us to digest our food, synthesize vital nutrients such as vitamins, and keep pathogens at bay. The rapidly growing field of microbiota research is starting to generate some tantilising results, linking our microbiota to everything from our weight, to our moods and behaviour.
But how is it that our microbes influence our health? How does our own behaviour — our diet and lifestyle — change our microbial ecosystems? And could we one day start to treat illnesses by manipulating our microbial communities?
In the latest episode of Up Close I spoke with a world expert in the field of microbial ecology. Professor Rob Knight is from the Department of Chemistry and Biochemistry, the BioFrontiers Institute, and the Howard Hughes Medical Institute, all at the University of Colorado, Boulder. Listen to the podcast or download the transcript here.