The benefits of restrictive diets like paleo and keto have been touted for more than a decade, but as gastroenterologist Dr Will Bulsiewicz, or 'Dr B', illuminates in this book, the explosion of studies on the microbiome show that elimination diets are in fact hazardous to our health. What research clearly indicates is that gut health is the key to boosting our metabolism, balancing our hormones and taming the inflammation that causes a host of diseases. And the scientifically proven way to fuel our guts is with dietary fibre from an abundant variety of colourful plants. As a former junk-food junkie, Dr B knows first-hand the power of fibre to dramatically transform our health and the good news is that our guts can be trained.