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The Obesity Code - Unlocking the Secrets of Weight Loss (Book 1) Spiral-bound – March 1, 2016

4.6 out of 5 stars 37,373 ratings

Purchased directly from the publisher, authorized distributor, or author. Never used. Professionally spiraled and resold by Sweethome Books. Sweethome Books is not necessarily affiliated with, endorsed by, or authorized by the publisher, distributor, or author.
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Product details

  • ASIN ‏ : ‎ B09JXLQG5Y
  • Publisher ‏ : ‎ Generic
  • Publication date ‏ : ‎ March 1, 2016
  • Language ‏ : ‎ English
  • Print length ‏ : ‎ 296 pages
  • Part of series ‏ : ‎ Code
  • Customer Reviews:
    4.6 out of 5 stars 37,373 ratings

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Dr. Jason Fung
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Customer reviews

4.6 out of 5 stars
37,373 global ratings

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Customers say

Customers find the book extremely informative, with clear explanations of decades of research and multiple references to studies. The book is easy to understand, with Jason Fung providing clear explanations, and customers report successful weight loss and improved health outcomes. They appreciate the sustainable fasting lifestyle approach, noting it's not as difficult as expected, and find the content compelling and thought-provoking.

2,023 customers mention "Information quality"1,949 positive74 negative

Customers find the book extremely informative, with multiple references to studies and scientific content throughout.

"...What makes this book and his lectures so valuable, is that he approaches everything from a medical model and shows why modern medicine is getting it..." Read more

"...It might not be for EVERY SINGLE PERSON OUT THERE but it works for a lot of people and I have seen it with my own 2 eyes...." Read more

"...of "truth" that feels right intuitively and is backed up by lots of great research. It's all about insulin levels and controlling them...." Read more

"...Thank you Jason for this wonderful, easy to read and understand book that not only removes quite a lot of the blame we and others put upon ourselves..." Read more

1,310 customers mention "Readability"1,251 positive59 negative

Customers find the book enjoyable and fascinating to read, with one customer noting that the appendixes are particularly worth reading.

"...She also has a book on ketogenic recipes in general that I found very helpful as she has many dinner recipes that can be prepared in 30 minutes or..." Read more

"...anyone to understand - making this book not just an engaging and interesting read but also a MUST READ for anyone wanting to understand more about..." Read more

"This is the best book of its kind on the market, and the only one you need to read if you want to understand how you can lose weight safely and..." Read more

"...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?..." Read more

824 customers mention "Ease of reading"785 positive39 negative

Customers find the book easy to read and understand, with Jason Fung explaining everything very clearly.

"...explains the process of glucose metabolism in a way I feel most lay people can understand...." Read more

"...It's amazing. It's easy. And I will live the rest of my life telling people about this book and will live the rest of my life eating this way...." Read more

"...HIGHLY HIGHLY RECOMMENDED. Thank you Jason for this wonderful, easy to read and understand book that not only removes quite a lot of the blame we..." Read more

"...One suggestion for those of you who choose to follow Dr. Fung's very simple, customizable, doable intermittent fasting program: Don't tell anyone..." Read more

586 customers mention "Weight loss"568 positive18 negative

Customers report significant weight loss success with this book, dropping between 12 and 26 pounds of fat, and find it to be the key to effective weight management.

"...you read through all the facts and figures he goes over...it makes managing your weight and your diabetes much easier over your lifetime without..." Read more

"...I can lose weight easily by cutting calories but it never stays off despite the fact that I eat healthier than most people...." Read more

"...only one you need to read if you want to understand how you can lose weight safely and naturally, reverse a number of metabolic conditions without..." Read more

"...[ASIN:1439190275 New Atkins for a New You: The Ultimate Diet for Shedding Weight and Feeling Great.]] by Dr. Eric Westman..." Read more

281 customers mention "Health"253 positive28 negative

Customers report positive health outcomes from reading the book, noting improvements in their health journeys and the benefits of eating healthier. One customer specifically mentions gaining valuable information about their body and overall well-being.

"...This diet is basically a ketogenic diet on steroids...great for so many ailments and used by many cancer patients...." Read more

"...: This book, and your own best instincts, are really all you need to improve your health...." Read more

"...He’s the best, believe me. You’ll walk away smarter, healthier, and probably annoying everyone around you with phrases like ‘hormonal balance’ and ‘..." Read more

"...This is one of the best health-related books we have read in years! Fung's premise and the way he supports it are fascinating and important...." Read more

216 customers mention "Eye-opening"216 positive0 negative

Customers find the book eye-opening and compelling, describing it as thought-provoking and meaningful.

"...I had plenty of energy, felt wonderful and looked great. I wasn't skinny by any means...." Read more

"...Accessible and Relatable: You don’t need a Ph.D. to follow along. Fung’s writing is clear, engaging, and even funny at times...." Read more

"...It’s so chock full of great information that it’s almost impossible for all of it to sink in on the first read." Read more

"...Mind-blowing, yes. Paradigm-shifting, yes...." Read more

200 customers mention "Fasting"183 positive17 negative

Customers appreciate the fasting content in the book, which includes various intermittent fasting methods and explains how it helps reduce insulin resistance, with one customer noting it's sustainable in the long term.

"...choose to follow Dr. Fung's very simple, customizable, doable intermittent fasting program: Don't tell anyone else what you're doing -- not even..." Read more

"...Intermittent fasting lifestyle is sustainable long term, and is a simple and inexpensive way to manage and maintain your weight and to encourage..." Read more

"...regarding insulin cycles, and how modifying your feeding schedule to conform to the preferred insulin cycle..." Read more

"...I have so much energy that I can work 100 hours a week and never seem to get tired...." Read more

148 customers mention "Effectiveness"122 positive26 negative

Customers find the book's approach effective, with multiple customers reporting that it worked well for them and explaining how it functions scientifically.

"...This? Solid gold. Jason Fung delivers hard-hitting facts and solutions that actually work. He’s the best, believe me...." Read more

"...a paraphrase than a quote, but the book helps you understand why "All diets work (in the short term) and all diets fail (in the long term)"." Read more

"...In fact, she discharged me from her care yesterday. In spite of the good results and cutting my insulin in half over the last two weeks, she wrote a..." Read more

"...I am working with my body's natural processes and it's very freeing to feel that way, instead of feeling like I need to fight--fight cravings, fight..." Read more

Immediate Results - my doctor won't see me now
5 out of 5 stars
Immediate Results - my doctor won't see me now
I have so much to say that I don't know where to begin. I am new and just started the fasting. I saw improved results almost immediately. I am taking two shots a day-- victoza and lantus. I hate both of them. I will admit I have not been a great patient with the meds -- metformin not a problem but the shots are. Along came Dr. Fung's book. In two weeks, I noticed results immediately. I had not seen my endocrinologist in 6 months. (They are hard to find where I live and I had to cancel one appt. and it took 3 more months to get another.) I was thrilled to start Dr. Fung's Intermittent fasting and thought my specialist would have to agree. She didn't. In fact, she discharged me from her care yesterday. In spite of the good results and cutting my insulin in half over the last two weeks, she wrote a discharge letter to my primary care doctor stating that I am non compliant. She even quoted me in the letter, when I told her about the fasting idea/concept. I had printed off several copies of interviews with Dr. Fung. She didn't look at them. She will no longer treat me. Why? Because I mentioned IF therapy. Prior to starting with the fasting my numbers were in the 300s with no medication. I started the fasting and am using half of my meds, and I so pleased about that. I just thought she would share my enthusiasm. Instead, all I got was the " I follow the guidelines of the ADA". I am just so frustrated - Her last words were "Lantus is your friend. Do not make it your enemy". I explained that I cannot lose weight on it and that I dislike the 2 shots a day I am taking and that it is keeping me fat. She didn't want to hear it. So in closing, I will have to go about this on my own and manage my diabetes through the book and without her help. We live in an area where there are so few specialists for diabetes and it takes a long long time to get an appt. Now she has written me off as if I am a bad patient not following orders. I feel like Elaine on Seinfeld- remember that one? The doctors all wrote each other notes about her bad behaviour. Wish I could be treated by Dr. Fung. Any advice?
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Top reviews from the United States

  • Reviewed in the United States on February 21, 2016
    Format: PaperbackVerified Purchase
    I am a PA with decades of experience with diabetes and it's ill effects. I have watched through my career, type 2 diabetics listen to medical advice and never get any better. When my daughter, who was a gestational diabetic with her first pregnancy had a fasting blood glucose of 288 mg/dl, it became personal for me. They gave her the usual Metformin script and sent her on her way. Knowing that these meds do nothing to cure the disease and that it would only head her to a life on insulin and further weight gain I asked her not to take the meds, stop all carbs for the moment and let me do some research. That was when I came across Dr. Fung's lectures on the internet. As someone who has been studying holistic medicine for 30 years it made complete sense to me.
    What makes this book and his lectures so valuable, is that he approaches everything from a medical model and shows why modern medicine is getting it all wrong.
    He explains the process of glucose metabolism in a way I feel most lay people can understand. It's important for every overweight or type 2 diabetic to understand this process to better understand what they have been doing to their bodies...and unfortunately what we in medicine have been doing to their bodies.
    What was most valuable to me was him quoting studies that are considered standards in the field of medicine...not studies on rats or studies that have 15 subjects...but studies conducted over years with thousands of participants...like the Frammingham study or the NHANES study. I had seen these studies in the most prestigious medical journals like JAMA...funny how some of the aspects of the studies that he cites just weren't included or stressed in the outcomes.
    After going over all the metabolism...the studies on why reducing calories and increasing exercise just doesn't work...he presents a series of plans to reverse (yes I said reverse) type 2 diabetes. There are several options and one is bound to be workable for most people.
    My daughter has a hectic schedule and always complained about diets that required 3 or more meals a day...she doesn't like to eat breakfast and has no time to schedule multiple meals. The four hour intermittent fasting plan worked great for her. After an initial adjustment of about 2 days (headaches which were not relieved by increasing her sodium, my guess was sugar withdrawl), she had no hunger, no cravings and felt great. Within a week her blood sugar was normal. She started this right before the holidays and was concerned about missing holiday dinners...my answer was that of Dr. Fung's: have your dinner, enjoy it and get back on track the next day. She did just that and got through the holidays effortless and satisfied that she wasn't deprived of a thing. She remained on her fasting protocol and just had her meal within that time frame. Her blood glucose was higher the next morning but normalized after one day. She chooses now to have one "cheat meal" each week and for 4 weeks the next morning her blood sugar was higher...but got lower each week and after 4 weeks her morning after a cheat meal her blood glucose was normal!
    Within 10 weeks she has lost 46 pounds and is thrilled with her progress. Her doctor is shocked and initially thought the diet was nuts but now wants to know more about it...hence why I ordered 3 copies of this book...perfect for the medical mind.
    This diet is basically a ketogenic diet on steroids...great for so many ailments and used by many cancer patients.
    I started on the diet myself and found similar results with the exception of my cheat day...maybe because of my age, I do not get into ketoses for days after my cheat day which slows down my weight loss. I have still managed to lose 16 pounds in 3 weeks effortlessly with the exception of the 2 day sugar hangover like my daughter experienced. I have since found a product that will put you into ketoses in a day, but it is very expensive and the taste is...not so great. I use it once a week and it allows me to have that cheat meal once a week without sacrificing my progress.
    My guess it that Dr. Fung will become villified for several reasons:
    1. His plan works without medicine
    2. The drug companies will lose a tremendous amount of money
    3. No special foods or supplements to buy
    4. No added expenses...in fact my food bills are much lower.
    5. He exposes the fact that this information has been available to the medical community for a long time and no one has acted on it.
    I highly recommend this book and highly recommend you read through all the facts and figures he goes over...it makes managing your weight and your diabetes much easier over your lifetime without much thought once you know how your body reacts to food.
    I also recommend getting an extra copy for your doctor because they will surely think you are nuts when you tell them what you are doing.
    I will be eternally grateful to Dr. Fung for giving me the tools to cure my daughter and better serve my patients.
    UPDATE: My daughter continues to do well with blood sugars that remain normal, her biggest complaint is that she has to keep buying new clothes. She has found her weight has stalled and after some investigation I realized why...she had been taking MCT oil, about 3 tablespoons a day in pill form (she doesn't eat breakfast and doesn't like the taste of coconut) and she stopped it at the same time her weight loss halted. MCT oil...and there are several like coconut and hazelnut, stay liquid at room temperature. They can be added to food like coffee or smoothies, even salads. I found that I can get back into ketosis at warp speed when I started using it. Amazon has several brands here and I like the 32 ounce Viva labs coconut MCT. I found that although the craving weren't horrible, I missed my sweets. There is a new book from Martina Slajervoa called "Fat Bombs" that I highly recommend. Tons of sweet treats that are keto friendly. I will say I hate stevia and it's aftertaste, but found Swerve to be a great substitute. I will also warn you that if you don't use MCT oil in many of the recipes and sub coconut oil in it's more solid form, the results are not nearly as good. The chocolate hazelnut smoothie does it for me...sometimes I sub ice for all the water and I get a soft serve like ice cream that tastes like I'm cheating. The MCT oil helps me get right back into ketosis after my cheat days without buying that expensive, horrible tasting powered drink I was using. She also has a book on ketogenic recipes in general that I found very helpful as she has many dinner recipes that can be prepared in 30 minutes or less. I have taken my blood sugar both before and an hour after eating these "Fat Bomb" treats, (I'm not diabetic) and my blood sugar stayed the same or went lower...that was using the Swerve, which is expensive but worth it and a bit cheaper if bought in the 3 pack as I do.
    4,421 people found this helpful
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  • Reviewed in the United States on December 26, 2017
    Format: KindleVerified Purchase
    I've known about low-carb diets since I was a kid in the 70s and my parents went on the low-carb "Atkins Diet," but I've avoided them because I love carbs (who doesn't?), but earnest to lose 40 pounds at the age of 56, I started to investigate the role of insulin in weight gain and Dr. Jason Fung's The Obesity Code proved to do an excellent job of driving home several important points between the role of carbs, insulin, and weight loss.
    For one, Fung gives us a narrative to show that doctors were making the claim that too many carbs led to obesity as early as the 19th Century, but these claims were eclipsed by the non-scientific Eat Low Fat, Watch Your Calories Diet, which Fung shows does not work. No amount of willpower can fulfill the expectations of a low-fat, low-calorie diet because carbohydrates high on the Glycemic Index stimulate insulin and high insulin results in two horrible things: fat storage and constant hunger.
    Fung makes it very clear that lowering one's insulin mostly by eliminating all processed sugar and carbs and eating in their place whole foods one can control one's appetite, which goes off the tracks when one eats breads, waffles, pancakes, pasta, etc. This research is also supported by Dr. Robert Lustig, author of Fat Chance.
    The book does not offer extensive prescriptions for daily amount of carbs or detailed menu plans, so I read some other books on achieving a state of ketosis for weight loss, and what I find is that the prescribed carbs per day tends to differ. For strict "orthodox" ketogenic, low-carb champions, such as Amy Ramos, author of The Complete Ketogenic Diet for Beginners, the amount is usually a mere 20-50 for the "first phase" followed by a maintenance level between 75-100 grams. However, some authors, such as Michael Matthews, author of Bigger, Leaner, and Stronger, say one can eat as many as 150 "good" carbs a day, or even more for some. By good carbs, I am referring to carbs from whole foods, not processed flour and sugar. Some authors, such as Amy Ramos, will say you can't eat quinoa, sweet potatoes, beans, or legumes of any kind, but other authors, such as Michael Matthews, are less dogmatic on this point.
    From reading The Obesity Code, I would suggest one experiment to find the right carb threshold and correct mix of ingredients since Dr. Fung, Dr. Lustig, and others seem to differ on this point.
    Additionally, I'd say one should experiment with the sweet potatoes, quinoa, beans, and legumes. If one isn't making weight loss goals with these ingredients, then take them off one by one.
    One point that Fung makes that is in contradiction with a lot of nutritional advice I've heard over the decades is that snacking is usually a bad thing because we are constantly stimulating our insulin. Fung observes that the low-carb craze of 2004 sank, not because low-carb diets don't work, but because the snack industry got involved and created all sorts of low-carb snacks, including chips, protein bars, and other snack foods, and this constant snacking kept people's insulin at a high level and brought in too many calories.
    Fung seriously examines the benefits of long durations between meals and encourages eating only 3 meals a day, and even fasting every now and then. However, he is not dogmatic. He points out that if one must snack, one must be careful to focus on whole foods and not processed "snack foods."
    By focusing on the role of insulin and showing that "being fat makes you fat" because a fat person is in a constant state of high insulin and high appetite state, Fung has made me very mindful of the carbs I put into my body. Highly recommended.
    Update:
    I've been following The Obesity Code, eliminating sugar, gluten, potatoes, and rice, for the last 6 months, and I have lost 50 pounds. My neuropathy burning pain in my left foot is 100% gone. I'm a believer in this book, and I will be adhering to it for life.
    3,760 people found this helpful
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Top reviews from other countries

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  • Aravind
    5.0 out of 5 stars obesity code is a guide
    Reviewed in India on May 8, 2025
    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
  • freddie
    5.0 out of 5 stars Its all about hormones
    Reviewed in the Netherlands on May 14, 2023
    Format: PaperbackVerified Purchase
    Very understable and a good read
  • Wesam
    5.0 out of 5 stars This book is an eye-opening truth about weight loss and gain
    Reviewed in Saudi Arabia on November 8, 2023
    Format: PaperbackVerified Purchase
    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!
  • Lector ecológico
    5.0 out of 5 stars Para una mejor salud mediante la dieta
    Reviewed in Spain on February 26, 2022
    Format: KindleVerified Purchase
    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.
    Report
  • Paul M
    5.0 out of 5 stars wow.
    Reviewed in Canada on June 16, 2025
    Format: PaperbackVerified Purchase
    Content of this book is a life changer.