Kate Quilton and Dr Javid Abdelmoneim 10 volunteers with a history of failed dieting to take part in an experiment, to find out if simple lifestyle techniques can help them lose weight in just six weeks. Kate and Javid also explore why increasingly plant-based diets are being used in sports, why men find weight-loss easier in a team and whether people would snack less if they realised how much exercise it would take to burn off those calories.