Tim Spector is Professor of Genetic Epidemiology at King's College London and Hon Consultant Physician at Guy's and St Thomas' Hospital. He has won several academic awards and published over 700 academic papers, a large proportion of which relate to nutrition and the causes of obesity. Since 2011 he has lead the largest microbiome project in the UK, using genetic sequencing to study the bacteria in the guts of 5,000 twins. He is the lead investigator for British Gut, the UK's largest open-source science project to understand the microbial diversity of the human gut. He is the author of THE DIET MYTH.