Dieting and nutrition have become a multi-billion dollar industry in recent years - but are we being sold a lie when it comes to calorie counting, exercise and fad diets? Today, Francesca and Louise talk to Professor Tim Spector about his decades of research into genetics, food and nutrition to discuss what does and doesn't work, recent discoveries about gut microbiome, and what blue foods can tell you about your intestines! See omnystudio.com/listener for privacy information.