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. Garry has tried it all to lose weight, from the Biggest Loser to meal replacement shakes. And despite temporary victories, the kilos always pile back on. Are Garry's gut bacteria keeping him fat and can the Gut Revolution help him? Nutrition scientist Dr Joanna McMillan and her team of experts explore new and controversial science that suggests gut bacteria might just be affecting our appetites and moods.