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, they take on the social media pariah - dopamine. They examine this tiny chemical's wide roles in the brain and body, and question whether we should make cognitive enhancers available for general use. There's also a dive into some intriguing research which suggests your breakfast could influence your most fundamental decision-making ability. Producer: Georgia Mills Researcher: Leonie Thomas Executive Producer: Robert Nicholson A Whistledown production for BBC Radio 4