Dr Michael Mosley trained as a doctor before becoming a journalist, podcast host and television presenter. His bestselling books include The Fast Diet, The 8-Week Blood Sugar Diet, The Clever Guts Diet, The Fast 800, The Fast 800 Keto, Just One Thing and 4 Weeks to Better Sleep. He was married to the author Dr Clare Bailey and they have four children.
Prof Roy Taylor is Professor of Medicine and Metabolism at Newcastle University and Honorary Consultant Physician at Newcastle upon Tyne Hospitals NHS Foundation Trust.
He was visiting Professor of Medicine at Yale University, where he acquired new MRI methods to look into the human body. Returning to the UK he raised GBP5.2m to establish the Newcastle MR Centre. He also developed the UK system for screening of diabetic eye disease and is author of over 300 scientific papers.