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The Obesity Code: Unlocking the Secrets of Weight Loss (Why Intermittent Fasting Is the Key to Controlling Your Weight) (The Code Series, 1) (Book 1)

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FROM NEW YORK TIMES BESTSELLING AUTHOR DR. JASON FUNG: The landmark book that is helping thousands of people lose weight for good.

Harness the power of intermittent fasting for lasting weight loss.

Understand the science of weight gain and insulin resistance.

Stop suffering and ditch calorie counting, yoyo diets, and excessive exercise.

In this highly readable book, Dr. Jason Fung, long considered the founder of intermittent fasting, sets out an original theory of obesity and weight gain. He reveals that everything you’ve been told about how to lose weight is wrong: weight gain is driven by hormones, and only by understanding the effects of insulin and insulin resistance can we achieve lasting weight loss.

Dr. Fung shares five basic steps to controlling your insulin for better health. And he explains how to use intermittent fasting to break the cycle of insulin resistance and reach a healthy weight—permanently.


From the Publisher

Jason FungJason Fung

Publisher ‏ : ‎ Greystone Books
Publication date ‏ : ‎ March 1, 2016
Edition ‏ : ‎ 1st
Language ‏ : ‎ English
Print length ‏ : ‎ 296 pages
ISBN-10 ‏ : ‎ 1771641258
ISBN-13 ‏ : ‎ 978-1771641258
Item Weight ‏ : ‎ 2.31 pounds
Dimensions ‏ : ‎ 5.9 x 1.2 x 8.9 inches
Part of series ‏ : ‎ Code

Price: $19.95 - $9.74
(as of May 21, 2025 12:03:40 UTC – Details)

FROM NEW YORK TIMES BESTSELLING AUTHOR DR. JASON FUNG: The landmark book that is helping thousands of people lose weight for good.

Harness the power of intermittent fasting for lasting weight loss.

Understand the science of weight gain and insulin resistance.

Stop suffering and ditch calorie counting, yoyo diets, and excessive exercise.

In this highly readable book, Dr. Jason Fung, long considered the founder of intermittent fasting, sets out an original theory of obesity and weight gain. He reveals that everything you’ve been told about how to lose weight is wrong: weight gain is driven by hormones, and only by understanding the effects of insulin and insulin resistance can we achieve lasting weight loss.

Dr. Fung shares five basic steps to controlling your insulin for better health. And he explains how to use intermittent fasting to break the cycle of insulin resistance and reach a healthy weight—permanently.


From the Publisher

Jason FungJason Fung

Publisher ‏ : ‎ Greystone Books
Publication date ‏ : ‎ March 1, 2016
Edition ‏ : ‎ 1st
Language ‏ : ‎ English
Print length ‏ : ‎ 296 pages
ISBN-10 ‏ : ‎ 1771641258
ISBN-13 ‏ : ‎ 978-1771641258
Item Weight ‏ : ‎ 2.31 pounds
Dimensions ‏ : ‎ 5.9 x 1.2 x 8.9 inches
Part of series ‏ : ‎ Code

Customers say

Customers find the book extremely informative, with many references to multiple studies, and appreciate how clearly Jason Fung explains the content. They report significant weight loss results, losing up to 26 pounds of fat, and note that their quality of life has greatly improved. The book provides valuable information about fasting, making it sustainable in the long term, and customers find it eye-opening and thought-provoking. While some customers consider it well worth the cost, others find it boring to read.

7 reviews for The Obesity Code: Unlocking the Secrets of Weight Loss (Why Intermittent Fasting Is the Key to Controlling Your Weight) (The Code Series, 1) (Book 1)

  1. Stevereeno

    i really really enjoyed this book
    Life changer. Im not much of a “book” reader. Do most of my reading online. But i must say, i really really enjoyed this book. I pick it up and reread it again and again. A dose of humility and humor in this book, with focus on plenty of studies that are not backed by BIG FOOD COMPANIES. Great read. A quick synopsis…people are eating too often !! Almost 180 deg opposite of what the government weight loss experts started telling us in the 1970’a (frequent meals/snacking, low fat, high carb). We had very little obesity before the 1970’s in America (no snacking, whole foods, less processed carbs and sugars, more time between ingesting calories…resulting in low insulin resistance). The establishment has taught and is teaching us to focus WAY too much on WHAT (calorie counting) to eat instead of timing we are eating, which is equally as important. Eat less/Move more is a 98% failure. The establishment tells us to eat moderate to high carb, low fat, eat more often, NEVER skip breakfast,and eat 5-6 times per day. We are told we are sloths and gluttons if calories in/calories out paradigm doesn’t work, because it should have worked if we were stronger human beings. Only problem is, we cannot beat our hormones in the long term. Yes, what you eat is important (not eating refined carbs, added sugars, artificial sweeteners, frequent eating highly refined snack foods, and the dreaded high amounts of long term fructose fatty liver damage), Obesity is a HORMONE PROBLEM. Our insulin and cortisol levels are the two key players that determine whether we gain weight or loose weight. Exercise is very important, but do not exercise to loose weight loss or even maintain weight. Exercise for stress/sleep management, cardiovascular health, bone density, depression management, etc.. But many people who exercise every day, don’t see the permanent and ideal weight loss they are looking for, if meal timing is not insulin friendly. Give insulin to a non-diabetic or a diabetic, even with calorie reduction and exercise, and they still gain weight. Sleep, daily intermittent fasting/fast 24 hours 2-3 times per week, eating whole foods…keeps the weight off. Calorie reduction diets do not create permanent weight loss due to the body compensating like a thermostat…you cut calories, you body compensates by lowering the amount of calories it burns. Increase calories, and your body ramps up to burn the extra calories. Calorie reduction diets lead to our body plateauing, we start feeling like crap and we think its all our fault…its what our body does…we get cold, metabolism slows, hunger hormones increase, and we rebound to overeat. Insulin sensitivity needs to increase. Persistent AND high levels of insulin create insulin resistance. Just as high and persistant antibiotic and narcotic use increases resistance, so does persistent and high insulin levels create insulin resistance. We need to have low insulin resistance and glucose levels low as possible in our bloodstream for a majority of our life in order to make our body cells more interested in accepting insulin and burning our body’s fat stores. We are meant to eat hearty meals with “natural” and “human” carbohydrates, but not snack all day in order to keep the weight off. I have been skipping breakfast all together, eat good size lower carb lunch, and then big dinner at 6pm and not eat again until lunch the next day. Cut out all snacking. Cultures with long life FAST in some manner….period. Whether they eat once or twice per day, or not eat snacks, or fast for 24 hours frequently. Cultures with low obesity NEVER eat small frequent meals. Cultures with low obesity eat whole foods. Gets easier and easier. I love to eat. I love to eat bread, rice, sweet potatoes, meat. Lets do this ! Many studies and Fung’s patient’s in his practice in this book to back up viewpoint. He eats more frequently on the weekend with his family. He eats dinner pretty much every night with his family. He skips meals mon-fri when he is busy. His eating schedule fits his lifestyle, and encourages readers to eat or don’t eat on a schedule that works for them. He eludes to “feasting” one or two fasting one or two days a week to remind the body that it is in fact not starving. Eludes to the possibility of even needing to fast 3-4 days initially or occasionally to get your body the message that you are not going to get food all the time. Yes, the first few times fasting will be difficult. It will get easier. Some willpower is initially needed. Transitioning from a keto-friendly low carb diet to intermittent fasting lifestyle is easier for most people. Billions of people have fasted for thousands of years, and they survive…and in fact thrive. Fit fasting in your schedule and your family life and find the strategy that works for you. Intermittent fasting lifestyle is sustainable long term, and is a simple and inexpensive way to manage and maintain your weight and to encourage your body to use its own fat stores for energy production. Frequent eating is not healthy and does NOT RAISE METABOLISM. Skipping breakfast will not harm you or slow your metabolism. Avoid artificial sweeteners (sucralose, asparteme, and yes…even the highly refined Stevia) as all have been shown to raise insulin levels by 20% and are at the very least not healthy…and people who use them do not usually loose weight. If somthing works for you long term (more than a year), stick with it. Almost ALL diets work in the short term, Dr Fung recognizes…it’s keeping it off for more than a year and simplifying our lives with a simple lifestyle of incorporating fasting is the goal here.

  2. Joe

    The Weight Loss Secret No One Told You (Until Now)
    If you’ve ever felt like the world of weight loss is one giant guessing game – keto here, low-fat there, and a sprinkle of kale on top – The Obesity Code is the book that flips the script. Jason Fung doesn’t just give you a diet; he hands you a roadmap to understanding how your body actually works. It’s like someone finally turned the lights on in a room you didn’t know you were stumbling through.Alright, alright, alright. Let me break this down for you. This book doesn’t mess around with trendy tips or gimmicks. Fung dives deep, y’all, into the science behind weight gain and loss. And here’s the kicker: it’s all about insulin. Turns out, our bodies are like carefully tuned engines, and insulin? That’s the fuel system. Too much of it over time? Boom, weight gain. It’s not about willpower – it’s about biology. Once you learn this, you can’t unlearn it. It’s a total game-changer.This book is incredible. I’ve read a lot of weight-loss books, folks – a LOT. Most of them are fluff. This? Solid gold. Jason Fung delivers hard-hitting facts and solutions that actually work. He’s the best, believe me. You’ll walk away smarter, healthier, and probably annoying everyone around you with phrases like ‘hormonal balance’ and ‘insulin resistance.’ Trust me, they’ll thank you later.What You’ll Love About This Book:Intermittent Fasting, Explained: Fung isn’t just jumping on a trend – he’s showing you how and why it works. No, you don’t need to eat six tiny meals a day. Skip a meal now and then, and you’re letting your body do what it’s built to do.It’s Science, Not Shame: Forget the blame game. Fung explains how weight gain isn’t your fault. It’s hormones, baby, and this book shows you how to take control.Accessible and Relatable: You don’t need a Ph.D. to follow along. Fung’s writing is clear, engaging, and even funny at times.Pro Tips for Diving In:Take Notes: This isn’t just a casual read – it’s a masterclass. Keep a notebook handy.Start Small: Don’t overhaul your life overnight. Pick one or two things, like skipping breakfast or reducing sugar, and see how it feels.Reread It: Seriously. There’s so much info here, you’ll want to go back and absorb it again.Things to Keep in Mind:This isn’t a “quick fix” book. You’re not going to lose 10 pounds in a week. But if you stick with it? Oh, the results are real.Be prepared to rethink everything you thought you knew about food. Fung challenges a lot of mainstream ideas, but he backs it all up with hard science.Final Verdict: This isn’t just another weight-loss book. It’s a manual for taking control of your health in a way that actually works. Jason Fung doesn’t just tell you what to do – he tells you why, and that makes all the difference. Five stars, easy. If you’ve struggled with your weight or just want to understand your body better, this book is an absolute must-read.

  3. Aravind

    The book clearly helps us to understand the multifactorial causes of obesity and to how to solve the issues regarding that and helps us to really have a knowledge about our own body and hormones. Great work is done by Dr. Jason Fung

  4. freddie

    Very understable and a good read

  5. Wesam

    I’m shocked by how brainwashed we have been, Dr Jason proves that obesity is NOT a caloric imbalance. It’s a hormonal imbalance and it’s a multifactorial disease. I recommend it!

  6. Lector ecológico

    Un libro excelente sobre la comida y la dieta. Explica las claves para una pérdida de peso segura y mejor salud a largo plazo.Basado en responder a dos preguntas:- Qué comer?- Cuándo comer?Las respuestas:- No comer alimentos industriales precocinados ni azúcar o hidratos de carbono refinados.- Hacer ayuno intermitente.

  7. Thiago Pallaro

    Já tentei perder peso – e perdi – pelo menos 3 vezes na minha vida. Sempre consegui bons resultados, mas dentro de um ano o peso sempre volta, e com reforços. A culpa sempre fica do lado do obeso, que se esforça MUITO mais que qualquer outra pessoa sem tendência a acumular gordura, mesmo comendo uma fração do que pessoas magras comem. A abordagem do Dr Fung é clara, se baseia em estudos científicos e oferece um novo paradigma pra se entender a obesidade e tratar sua causa original, e não aparente. Deveria ser leitura obrigatória pra professores de academia, nutricionistas e médicos que lidam com pacientes obesos.

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