I absolutely love this book and would recommend it to everyone. Dr. Will Bulsiewicz (a.k.a. Dr. B) is a gastroenterologist, but he’s also incredibly approachable. I’ve followed him over the years and genuinely appreciate his knowledge, compassion, and sense of humour. Nearly half the book is recipes, so don’t be intimidated, this is an easy, engaging, and entertaining read.
The book is thoughtfully structured into three parts, each building on the last:
- Part 1: Knowledge is Power
- Part 2: The Fiber Fueled Approach
- Part 3: The Fiber Fueled Plan
Part 1: Knowledge is Power
This section dives deep into gut microbiota. Did you know there may be up to 36,000 species of bacteria living in your gut? The key to a healthy gut is diversity. When the gut microbiome is imbalanced, it can contribute to a range of diseases. Dr. B discusses symptoms of a damaged gut, some expected (gas, bloating, abdominal pain), and others surprising (anxiousness, sinus congestion, bad breath).
He explores how the gut is essential to immune function and connects it to metabolic conditions (like obesity, type 2 diabetes, pancreatitis), hormonal conditions (endometriosis, sexual dysfunction, breast cancer), and neuropsychiatric conditions (Alzheimer’s, Parkinson’s, fibromyalgia, depression).
Dr. B. explains how our modern lifestyle, marked by being overfed, undernourished, and hyper-medicated, is damaging our health. He critiques the Standard American Diet (SAD) for its excess of sugar, refined carbs, salt, preservatives, additives, artificial sweeteners, unhealthy fats, animal protein, and fad diets.
He also takes a deep dive into fiber and short-chain fatty acids (SCFAs), explaining their powerful role in protecting against disease.
Part 2: The Fiber Fueled Approach
This section focuses on how to heal your gut by increasing fiber intake. For those who struggle with fiber digestion, there’s a full chapter dedicated to overcoming food sensitivities and intolerances. Fermented foods are another key element of gut healing.
Dr. B also breaks down the gut health essentials: prebiotics, probiotics, and postbiotics. To make it easier to remember what to eat, he introduces a simple acronym: F-GOALS
- F: Fruit & Fermented
- G: Greens & Grains
- O: Omega-3 Super Seeds
- A: Aromatics (onions, garlic)
- L: Legumes
- S: Sulforaphane (broccoli sprouts & cruciferous veggies)
Part 3: The Fiber Fueled Plan
The final section lays out a practical, approachable plan to put the knowledge into action. It includes easy and tasty recipes to help you start your journey toward better health.
This book is amazing—it provides both the “why” and the “how” behind the plan, which is key to lasting change.
If you’re living with GI issues or chronic disease and haven’t read Fiber Fueled, get yourself a copy now. You won’t be disappointed, and you’ll be well on your way to better health. And if you ever get the chance to hear Dr. Bulsiewicz speak, don’t miss it—he’s down-to-earth, knowledgeable, and truly inspiring.