Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body, asking what it can tell us about our innate capacity for change. In this episode, Kimberley and Xand muse on the personal and social significance of the liver. They explore the amazing science of liver regeneration, discover the unexpected roots of our cravings for alcohol and fatty foods, and hear the poignant story of the first person in the UK to give part of their liver to a stranger. Producer: Dan Hardoon Researcher: Emily Finch Executive Producer: Kate Holland A Whistledown Production for BBC Radio 4