We interviewed Prof. Joël Doré, Head of Research at the French National Institute for Agricultural Research (INRA – Institut National de la Recherche Agronomique), at the 2nd Gut Microbiota for Health Summit, in order to find out more about gut microbiota. Prof Doré’s interview includes an explanation on why we prefer the term ‘gut microbiota’ to ‘microflora’ or ‘gut flora’, when referring to the bacteria living in our intestines. Doré shares his knowledge of the subject, while also explaining where we can find large amounts of bacteria in our bodies and how big these bacteria are.