A brand new series of the show in which Dr Xand van Tulleken and dietician Hala El-Shafie help members of the public tackle some of the most hyped weight-loss regimes on the scene. The dieters are divided into three time frames: Crashers try short term diets; Shape Shifters take on a six week programme; while Life Changers sign-on for four month dieting plans. CafÚ cook Stacie Stewart helps the volunteers to turn their diets into delicious dishes. In the first episode of the third series, Becky and Sheena from Devon have only two weeks to shape up for Sheena's hot tub party. Sheena tries the punishing Copenhagen diet, an ultra weight loss regime, while Becky tries the Special K challenge, mixing cereals and high fibre.