Dr Jack Mosley is the son of Michael Mosley, pioneer of the hugely popular 5:2 diet and the Fast 800 books and program www.thefast800.com. Jack studied medicine at Newcastle University and received a Distinction in his Masters of Research in diabetes with Professor Roy Taylor, whose remarkable work proved the transformative effect of weight loss and diet on type 2 diabetes, leading many hundreds of thousand putting their diabetes into remission. Jack worked as a doctor in emergency medicine in the UK and Australia and now works as a GP registrar.