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.

Dr Sarah Schenker is a registered dietitian and accredited sports dietitian. She has served on professional and government committees and worked with some of the biggest food and drink brands including Sainsburys, Waitrose and Tilda. She has also worked with some of the best-known sports names in the UK, including Chelsea FC, Tottenham Hotspur FC, Southampton FC and Norwich City FC. She is the author of My Sugar Free Baby and Me and been involved in numerous diet and recipe books, including The 8-Week Blood Sugar Diet, Eat your Way to Lower Cholesterol and The Midlife Kitchen.