Gut Revolution seeks to sort the facts from the faeces in an observational series that follows two people with debilitating gut issues on their quest for better health. Could changing their gut bugs turn their health around in just six weeks? Is your mood influencing your gastrointestinal health or is it the other way around? Can a nutritional intervention provide help to sufferers of irritable bowel syndrome where modern medicine has little to offer.

Part 1: Melissa's Story

26-year-old mother of two Melissa has been battling a painful case of irritable bowel syndrome for the past two years. She's seen all the doctors and had all the investigations but no one has been able to help her. Can the latest science driving the Gut Revolution provide any answers? We follow Melissa over her transformational six week journey as our team of experts design an intervention that literally changes her life.

Part 2: Garry's Story

Garry has tried to lose weight, but could his gut bacteria be keeping him fat? Nutrition scientist Dr Joanna McMillan explores controversial science suggesting gut bacteria might be affecting our appetites and mood.

Part 3: Victoria's Story

48-year-old Victoria has chronic anxiety disorder. She's battled this her whole life. But in the past few years she's begun suffering from excruciating gut problems. No one has been able to provide answers. So, are her gut bacteria the missing link in causing her symptoms? Nutrition Scientist Dr Joanna McMillan takes on her most challenging case, exploring emerging science about the links between gut bacteria and the brain to design an intervention to help Victoria where all else has failed. Victoria's struggle is revealing, at time confronting, but above all, inspiring. And the results - astonishing and life-changing.