The Complete Guide to Fasting: Heal Your Body Through Intermittent, Alternate-Day, and Extended Fasting
A science-first way to lower insulin, unlock body fat, and rebuild health without white-knuckling hunger
About This Book
This guide shows you how to use fasting as a flexible, zero-cost tool to restore metabolic health. You’ll learn why meal timing matters as much as food choice, how insulin drives weight gain, and how to switch from burning sugar to burning stored fat. With simple schedules like 16:8 and practical tips for electrolytes, workouts, and social events, you’ll reduce hunger pangs, improve focus, and steady blood sugar. Real physiology replaces myths about “starvation mode.” You’ll also discover the brain benefits of ketones, the cellular cleanup of autophagy, and safe ways to try extended fasts with confidence.About the Author
Jason Fung, MD, is a Canadian nephrologist who treats metabolic diseases at their root cause. Working with thousands of patients with obesity and type 2 diabetes, he popularized therapeutic fasting and low-carbohydrate nutrition as powerful, drug-sparing tools. Known for clear explanations of complex physiology, Dr. Fung connects hormone dynamics, meal timing, and real-world routines to help people regain health. Collaborator Jimmy Moore has shared extensive personal experimentation with fasting and ketogenic eating, bringing a practical, day-to-day lens to these methods.
Biggest Takeaway
- Consistent fat loss without slowing metabolism - Lower fasting glucose and insulin resistance for type 2 diabetes reversal - Diminished cravings and steadier energy throughout the day - Better focus and mood from ketone-fueled brain function - Reduced waist size and improved lipid risk markers - Flexible schedules that fit busy work, travel, and family life - Practical strategies to handle hunger, workouts, and social meals - Clear safety guardrails for medications, electrolytes, and refeeding
Key Insights from This Book
Explore the most important ideas and learn how to apply them in your life.
Why fasting isn’t starvation and how control changes everything
Calories aren’t the core problem, insulin is—unlock the fat freezer
Hunger is a trained signal you can retrain in a week
Medication, safety, and the smart way to fast with diabetes
Extended fasting works—learn the refeeding rules before you try it
Train in a fasted state and keep performance while burning fat
Ketones and autophagy give your brain a tune-up during fasting
Feast and fast are partners—plan around life, not against it
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