The Hunger Code: Resetting Your Body's Fat Thermostat in the Age of Ultra-Processed Food

THE SEQUEL TO THE MULTI-MILLION COPY BESTSELLER THE OBESITY CODE BY ACCLAIMED NEPHROLOGIST AND NEW YORK TIMES BESTSELLING AUTHOR, JASON FUNG, MD

"Jason Fung nails it again in The Hunger Code. This book clearly and compellingly explains why most Americans are overweight and gives us a concise, evidence-based way to manage our weight with as little hunger as possible."-Dan Buettner, New York Times bestselling author of The Blue Zones

The Obesity Code helped thousands of people lose weight naturally.

The Hunger Code will help thousands more lose weight--and keep it off--in an era of weight-loss drugs and ultra-processed foods...without counting calories.

For generations, we've accepted the story that weight loss can never last--that as soon as we go off the diet or stop taking the medication, we revert to our old habits, regain the weight, and the calorie-counting journey starts all over again. Traditional medicine continues to treat the symptom of weight gain rather than addressing its root causes. Too often, healthcare systems intervene with quick fixes and short-term solutions, ignoring the factors that lead to sustainable weight loss that can last a lifetime.

What if the secret to long-term weight maintenance and better health isn't just about what you eat--or even when you eat--but why you eat?

With the food industry's reliance on ultra-processed foods and the popularity of Ozempic and Mounjaro, understanding the forces behind why we eat is more important than ever before.

In The Hunger Code, New York Times bestselling author Dr. Jason Fung reveals the three powerful forces that drive us to eat:

• Physical Hunger
• Emotional Hunger
• Social Hunger

Dr. Fung also introduces the concept of the body's "fat thermostat"--a biological "set point" that regulates how much fat your body tries to maintain. Guided by hormones and metabolism, this internal system drives hunger and energy use, explaining why lasting weight loss requires more than just willpower ...

With three Golden Rules and 50 actionable tips, The Hunger Code empowers you to recognize and respond to hunger appropriately. Learn how to slow digestion, break emotional eating cycles, and overcome social pressures to eat constantly, so you can maintain a healthy weight--from scratch, after fasting, or after using weight-loss drugs.

Author: Jason Fung
Publisher: Greystone Books
Published: 03/03/2026
Pages: 288
Binding Type: Hardcover
Weight: 1.15lbs
Size: 9.10h x 5.90w x 1.00d
ISBN: 9781778401565


Review Citation(s):
Publishers Weekly 02/02/2026

About the Author

Dr. Jason Fung is the New York Times bestselling author of multiple critically acclaimed science and health books including The Obesity Code, The Diabetes Code, The Obesity Code Cookbook, The Diabetes Code Cookbook, The Diabetes Code Journal, and The Hunger Code. Dr. Fung completed medical school at the University of Toronto and a fellowship in nephrology at Stanford University, and is now a practicing nephrologist (kidney doctor) and co-founder of The Fasting Method, a program to help people lose weight and reverse type 2 diabetes and obesity. He lives in Toronto.