Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body, to find out what it can tell us about our innate capacity for change. In this episode, Kimberley and Xand head up the rebranding of an organ with terrible PR - fat. They hear why fat is intrinsically linked with being human, how it's doing a lot more for us than just sitting there, and why having a bit more fat can help us take the plunge. Producer: Georgia Mills Researcher: Leonie Thomas Executive Producer: Robert Nicholson A Whistledown production for BBC Radio 4