87 thoughts on “Dr. Jason Fung – ‘The Aetiology of Obesity’

  1. Thanks for the shout out Jason. 🙂 For more info on the insulin index see http://wp.me/p5VAQF-5u on Optimising Nutrition.

  2. Great vid, though from my angle, I think it's pretty focused on food only. I'll challenge your knowledge set with some quantum and chronobio. What about the controllers of insulin like sunlight and electron loss at cytochrome complex I NADH and II FAD. Could it be that a lot of people that develop insulin resistance are also low in Vitamin D? Yep. Is that an indicator of the lack of sunlight on surfaces? Yep. Or if you build a poor H3O2 exclusion zone with water inside of cells (Gerald Pollack's work). Or what if you blast up your cortisol at night and kill off your melatonin under blue-light (artificial lighting) watching TV, checking your cell or going to the gym late. They react to light, don't they. Or electron theft from being in an electromagnetic field for prolonged periods of time. Lotta reasons outside of food to screw over your insulin. The biophysics is playing a large role in people's lives that is requiring them to eat lower carb due to the hits to cytochrome complex I, especially in the winter when sunlight is not too available (and they are avoiding it to boot).

  3. "We're not that smart." yeah, what happened is industry to control of everyone's brain and turned us into zombies – "calories in, calories out."

    The world is still full of brain dead zombies.

  4. Big problem – is it insulin or insulin sensitivity? Two sides fo the same coin. What screws up insulin sensitivity? PUFAs –

    We know if we feed lab rats a bunch of PUFA with carbs they get fat – same reason when cows are to be fattened we feed them corn (loaded with Linoleic acid the most common PUFA ).

    We know know that this change of insulin sensitivity happens on the mitochondrial basis –

    More at Hyperlipid..

  5. Huge number of assumptions/wrong conclusions and oversimplified approach. Typical doctor crap that has very little understanding of human physiology.

  6. You want to hear something sad? There is a keto group on Facebook called Optimal Ketogenic Living who bans people for suggesting Dr Fung. If you don't follow THEIR plan, they remove you.

  7. This post is for all you American people who are unhealthy of eating the American toxic diet ..don't die from heart disease or diabetes ! ! I hope my post will help you in a positive way …I am a Vegan but I don't eat anything with white flour , dairy .my diet is very low fat and low carbs , no oils, no avocado no fat; this is the diet I follow ; "Here’s how my intermittent fasting diet works " :..You get up in the morning and drink a glass of water or a cup of coffee or tea. You can use a little creamer or low-calorie sweetener like stevia, and you can take your supplements if they don’t upset your stomach. But do not eat breakfast or drink anything other than coffee, tea or water.

    Do 20–45 minutes of moderate aerobic exercise—walking, jogging, cycling or whatever you enjoy doing.

    After you exercise, get on with your day, but continue fasting until lunch. Drink water, coffee or tea. Don’t worry about being too hungry to make it through the morning. This fasting/exercise combo dampens the appetite, and the caffeine in coffee and tea helps blunt hunger as well.
    At lunchtime, break your fast and eat normally for the rest of the day. Get plenty of lean protein and low-fat, low-glycemic carbohydrates. Be sure you make healthy, sensible food choices. You don’t have to count calories, but you don’t want to pig out at lunch or dinner, either.Twenty minutes Before dinner take two spoons of Apple cider vinegar that will help your body control insulin and lose weight on a low fat and carb diet .

    But What About Breakfast?

    Yes, this intermittent fasting diet goes against the conventional wisdom that breakfast is the most important meal of the day. But the difference here is that I’m suggesting that you wait to “break your fast” around noon, instead of upon arising.

    The caloric reduction that skipping breakfast bestows is huge. As long as you eat normal, healthy meals at lunch and dinner—without making up for the calories you didn’t eat in the morning—you will reduce your caloric intake by about 30 percent. If you do it for six days, it’s the equivalent of a two-day total fast, and one month is similar to fasting for 10 days.

    How the Intermittent Fasting Diet Melts Excess Weight

    The intermittent fasting diet takes advantage of, and expands upon, the 10–12 hours you normally fast while sleeping.

    By morning, your body is beginning to deplete the glycogen in your liver (from the carbohydrates eaten at your evening meal) and is starting to rely more on fat for energy. As your glycogen stores are progressively exhausted, your liver starts converting fat into ketones, which the brain and other tissues use as fuel. This fat-burning state is called ketosis.

    Aerobic exercise while in the intermittent fasting state is a crucial part of the program because it rapidly puts you into ketosis. Overnight fasting is a start, but exercise really kicks things into high gear. The fuel used during the morning walk you’re taking in place of eating breakfast comes from burning fat, which is exactly what you want when you’re trying to lose weight.
    Even better, if you continue fasting after exercising, you will stay in the ketotic state, further reducing fat stores.

    What the Research Says

    The exercise-enhanced intermittent fasting diet has been evaluated in a clinical trial that involved volunteers with an average weight of 199 pounds, BMI of 32.2 (30 and over is considered obese), waist circumference of 42.6 inches, and fasting insulin of 13.2 IU/mL (a level indicative of insulin resistance).

    After 12 weeks, the participants lost an average of nine pounds and an even more impressive 16 pounds of fat (25 percent of their initial fat mass) plus three inches around the waist. Additionally, the group’s fasting insulin fell by one-quarter, into the normal range.
    I advise all my patients with type 2 diabetes to lose weight and reverse their diabetes using my mini-fast with exercise program, or intermittent fasting diet.

    The Obesity Code: Unlocking the Secrets of Weight Loss – Paperback Book – March 1, 2016
    by Dr. Jason Fung
    Show less

  8. Dr. Fung drinking game. (Have a large glass of water on hand. ) Take a sip Everytime he says "right?". 😉

  9. I agree with ALL it. Fasting is key. The only real issue then is, it STILL takes willpower to fast. One must STILL not eat for certain periods of time. Yes, the answer is simple: don't eat. Deplete your "freezer." It's the application of this remedy of fasting that is, again, the problem.

  10. So explain this: my father was diagnosed with diabetes type-I when he was 30 y.o.
    He started injecting insulin in high doses (100 units a day) because in those days (>45 years ago) it was very hard to keep his sugar levels stable. Due to the high doses he also had to eat a lot and he did eat a lot and very healthy: no sugar, whole wheat bred, low fat, hardly any alcohol etc. but he lost 20% of his body weight right after starting with insulin, like within 1-2 weeks. He fought the rest of his life against low body weight until he died at the age of 70 y.o.
    His brother was diagnosed with diabetes type-II at the age of 60. His brother started injecting insulin but kept on eating sugar. He was always very low weight for his height but didn't gain a gram of weight after starting with insulin.
    My sister was diagnosed with diabetes type-I on the age of 40. Like all of us she was also quite thin. After taking insulin she never gained any weight, nor lost weight.
    So apparently there are people not gaining weight at all when using insulin and some even lose a lot of weight when taking insulin.
    I am not questioning what dr Jason Fung says though, I think he is highly intelligent and by far most people gain weight after taking insulin.

  11. I'm a 53 year old male. (picture is my wife). I had diabetes II for 7 years and I've been fasting for 2 years now. My weight was from 215 to 168 lbs. My metformin is now down from 5 to 2 tabs a day. My AIC is always between 5.6 and 6.8. I eat non-stop from 6pm to 10pm daily. I eat anything. Sweets and anything and a lot, really a lot. My doctor says she don't like what I'm doing but all my numbers are OK so she said do whatever you're doing. Now I eat 3 meals per day on weekends. I am hooked to this diet and I can't imagine stopping because everyday I look forward to 6pm because I will eat whatever and I don't count how much or what it is. It's a daily feast. I hope someone tries this because it is very enjoyable. I'm loving my diabetes. It made me eat whatever I want.

  12. He mocks people for saying that carbs (calories) is the cause of obesity, so to avoid too many calories is to avoid obesity/diabetes. According to him, one must blame insulin, which is the ultimate cause, and not calories, which is only the proximate cause, for causing obesity/diabetes.
    And yet, by the end of the video, he himself is saying it's the refined carbs (the proximate cause) that leads to increased insulin (the ultimate cause). In other words, he has come to the same conclusion as the people he set out to mock, that it is too many refined carbs (calories, the proximate cause) that leads to obesity/diabetes. Bingo!

  13. Thanks Dr. Fung well done, a fan, – but this message is hard to get out – Filed a complaint with my hospital admin to do "No Sugar Zone", i.e. they were first to post No Smoking Zone, but lost – SOC has too much Legal Standing – (50% of staff is obese – "Health Professionals??") the issue is Modern medicine has abandoned “Root Cause” investigations in favor of “Diagnosis and Drugs”, – this is odd as metabolism is a “Response Mechanism” – and we are seeing the results of Medicine by Chemistry, without “Root Cause Analysis” …
    www.70GoingOn100.com the Centenarian Diet, or maybe 128, the Hayflick limit, or if a Ray Kurzweil fan then this is a Moot Point …

  14. Please explain how to fast like time how many hours or how many days a week. I also have enlarged prostate where some say have water of 8.5 PH some say one tea spoon of Baking Soda with water 8.5 PH some say have water with Hydrogen of minimum 1.2 ppm and ORP of -500 (Negative 500). I am confused. Please help as I am from India. I remain seated waiting for passengers for long hours could this be the cause ? now my feet are swollen and I can't put a bedsheet over them as it feels like a big boulder on my toes.

  15. I love the Obesity Code. Have lost 12 lbs in 3 weeks already (much more to go). What struck me is that I am back to what I always deep down knew was the way to lose weight: just don't eat. That's what I used to do, but then I began listening to all the mambo jumbo out there and kept gaining wait. Super easy and effective! I feel great!

  16. Wow. Such an eye opener. I was one who lost 175 pounds and gained 50 back this past year. Why? Because my hunger levels were through the roof! I became hungrier than when I was 175 pounds heavier! Here I am. Keto day 4 and seeing a bright future and understanding ahead of me.

  17. Been listening to Dr Fungs videos for a while and im hooked also read his book the obesity code. This man is spreading the best and most accurate information to cure modern disease.

  18. Dr Fung , you are a genius! I found your book a year ago and as a 73 yr old retired nurse, I followed intermittent fasting and LCHF. 50 lbs later, I do not have to die fat. Wish I could give you a hug! Keep on keeping on and I will try to inspire others! God Bless you!!!!

  19. I happened to come across Dr. Fung's advice and information after I wasn't feeling so well and I started noticing all these people who are bloated and waterlogged they looked exactly like me. I knew I had to make a change I don't want all the added diseases symptoms from excess weight. So after having some heart palpitations and excess water in my legs I decided to go for it. I first started with intermittent fasting and then I did a water fast for 3 days and have been juicing for a week. I have lost 12 pounds exactly since the second week of May 2018. I understand it might be water weight none-the-less I lost the 12 lb when nothing else would work. I am exercising and continuing with the intermittent fasting and making sure that I eliminate as many process carbohydrates as possible.. I'm not starving and I feel that as I continue this I will create more mass muscle mass and finally eliminate a lot of the fat. I won't have that puffy exhausted person look

  20. He is wrong when he says we don't burn muscle for fuel when we fast. Our red blood cells can only use sugar as a fuel and that can only be made from our muscle protein. I don't trust him as this is very basic information indeed.

  21. Thank you so much for the information ! I finally have possession of the keys to good health and weight loss and can turn it on and off at will with a good balanced keto plan and intermittent fasting it’s too easy

  22. I'm scheduled to have a blood test taken soon mainly for my A1C. What other things should be tested with a blood test that my Dr. isn't testing for.

  23. Listening wtf are ll these idiots laughing at? he's not even trying to get a laugh…although his use of idiot is hilarious to me, he says it all the time

  24. Always get a blast on your lectures.
    I'm so grateful to have found you Dr Fung you have given the answers to questions I had for years and have clarify my thoughts thanks again.

  25. I used to watch chris gethin video for my gym schedules .In the video he says the ratio of burning fat will be very less if you have sugar/carbs in thd body so cut off all the sugar first to burn the fat drastically and he was right.Since then i always wanted to know whats so special with cutting off of carbs .After watching Dr. fung's videos now i have the answer 🙂

  26. I started Intermittent Fasting. I rested the whole day. Within the first 20 hours my blood pressure shot up to 171/98. After taking a pill to decrease my BP,, I ate and slept. Next morning felt good and continued fasting. Iexercized moderately. Within 20-21 hours my blood pressure increased again to 152/101 and had to take a pill as well as eating to stop the headache and red eyes. 59 years old, usually elevated blood pressure to 130 plus, sleep 5-6 hours per day. In the morning of the third day, about 11 hours from takind pill and eating, blood pressure at 135/74. Perhaps you could enlighten us with this aspect of fasting? From a small internet search I read that fasting causes an increase in blood pressure to: 1. People with hypertension 2. People who wake up before sunrise. Is this consistant with your model?

  27. if im doing intermittent fasting then should there be a particular calorie number i should aim for? would i still eat in a deflect and lower insulin to lose weight or eat at maintenance lower insulin to lose fat? thanks

  28. If only Politicians had common sense like Dr.Fung. Life isnt rocket Science. Just a little common sense goes a looooong way

  29. I'm doing the fast now for 19 hours, then I drink and eat food contains sugar, carbs, does that mean all my fasting is no more effective??

  30. Low carb, low fat, plant based diet, Intermittent fasting, fasting, unprocessed foods made me loose 40 pounds in 3 months.I have reversed my diabetes and fatty liver and I feel more energetic and healthy than ever.

  31. You eat too much because you are hungry because there are homones that make you hungry. Thats why you eat too much calories

  32. I have been trying Dr Fung's ideas for 5 weeks now (low carb low sugar / 20-4 Fasting). I am amazed by the effectiveness of Intermittent Fasting, not only have I lost 14 lbs but I was taking 136 units of insulin a day and I am now COMPLETELY OFF insulin and my blood sugars which averaged around 9.5 are now averaging 5.4. Dr Fung I applaud you !!! Thank you for this wonderful change in my life!!!

  33. My Grandmother was a Victorian lady, she knew that bread, biscuits, scones, cake and sweets made you ill and fat – why and when did we forget what she had known all her life?

  34. It is possible to be fat and also have hypoglycemia. People with hypoglycemia can't maintain safe blood sugar levels while fasting half the day.–which is Dr. Fung's treatment to lower insulin. Even people with diabetes (hyperglycemia) can also suffer from periods of seriously low blood sugar, as well. Dangerously low blood sugars can be fatal pretty quickly. The trick is to lower insulin without raising/lowering blood sugars precipitously. So, then what?

  35. Dr Banting won a Nobel Prize for his medical research in 1923, not 150 years ago! Or was this just exaggeration for emphasis?

  36. he's off on 1st law of thermodynamics slide….not all calories consumed from food is equal to calories burned during physical activity…..some of the calories are stored in the body which is represented by U (internal energy), thus, the equation is Ein = Eout + U or in other words U (internal energy) = Ein (energy consumed) – Eout (energy burned)…also he can not apply the 1st law of thermodynamics on alcohol because in the 1st place alcohol is metabolized in the body by the liver via the enzyme alcohol dehydrogenase (ADH), therefore it is destroyed and converted to Acetyl-CoA…well too much application of engineering principles to drive a point

  37. Gosh this is so enlightening. I’ve been watching Dr Fung for the last few weeks. I have his Fasting book from the library. This explains so much. I lost 50lbs several years ago (with probably 30 more to go). I did it on Weight Watchers. It’s the first time I’ve ever been successful. Then, I started getting so hungry. I couldn’t figure out why I was so completely in the zone for probably 1 1/2 years and then fell off the wagon. Could not get back on. Then I got pregnant. Now I’m probably 60lbs heavier than that and just can’t figure this out! I’ve tried intermittent fasting and feel great but something always gets me out of the zone again. My whole point in writing is…it’s really interesting to hear Dr Fung say “this isn’t your fault, your not a glutinous pig”. Although I know I’ve made horrible choices, I know that. I know this is partly my fault in a huge way on a certain level. And I’m someone that would always say “I don’t blame my weight on others, I don’t blame it on emotions etc. I just like to eat and eat too much. Period. And don’t have control”. I feel like this kind of video gives me hope to try. It’s hard to lose weight, gain weight and get the courage to start again. You just keep thinking, “I’ll fail again”. Thanks for the video.

  38. Also, I would love to know what the solution is for type 1 diabetics. I have a friend who is insulin dependent. I would love to point her in a right direction.

  39. I knew that insulin plays a big role in weight changes but I didn't think it plays that much of a role. It's pretty much the only cause (besides cortisol) for any weight gain and overrides the significance of calories completely. I think that's amazing and we need more people like you who look at things deeper and more scientific than just from the surface like you said with the proximate and the ultimate cause. Thanks for sharing this Dr. Fung!

  40. People aren't that smart because they all have metabolic syndrome from those healthy whole grains, causing reduce brain activity.

  41. Im feeling very emotional listening to this. I have eaten healthily, walked and exercised, try to stay active all day. I have felt hungry and eaten more than I intended, tried eating regularly to keep blood sugars level but in the last 3 weeks I have tried IF. Oh my goodness! Im not hungry all the time and I have lost weight. This seems to be the missing link in my conundrum. Thank you Dr Fung. Your explanation makes so much sense and to hear someone explain that we are not all gluttonous lazy slobs as so many people think we are just brings tears to my eyes.

  42. The problem with "calories in – calories out = calories stored" is that other N equations needed to the model the system that the energy is used by are missing. If an energy balance is used for an engineering analysis then the statement of the first law of thermodynamics would be the first of many steps of analysis. It would not be stated, or be useful, without also developing a model of how the system in question behaves in response to the energy flows. The root of the "calories in – calories out" failure is that that additional analysis was always missing. It is still missing, actually. Nowhere will you find the pages of math that would be necessary to fully model the system. What you'd end up with, if you did that full analysis, is a set of differential equations that model flow of energy and actions of metabolism over time. It wouldn't be simple.

  43. You are a real doctor! Dr Fung is genius….he solve the problem of obesity in a very simple way IF….high fiber diet and so on…You are Gods given gift to humanity….a million thanks…job well done.

  44. I 3 personally know 3 people who followed his advice, lost weight, got off of metformin, and have really good blood work now. Dr. Fung is the man! Read his books (or listen to them). His series on youtube is excellent.

  45. I have been keto over 2.5 years and intermittent fasting about 5 days a week for 2 years. I lost 50 lbs., maintained my new healthy weight, and have not gained anything back. I actually have to force myself to eat some days because hunger is rarely an issue. On the SAD, I was getting hungry every day after 2 hours of not eating anything.
    I am so happy for this new scientific information that has come forth. Thank God that Dr. Jason Fung freely gives this information to others to help them become healthier. It is a very unselfish act that shows how he truly believes in people becoming better for themselves.

  46. For anybody that works a physically demanding job, just know that this works with that also. I work very hard most days, and I still can fast 16, 18, 20 hours with no feelings of hunger. Just the other day I did a 22 hour fast and only ate because I had to take a lunch break. I never once lost energy, or even felt the slightest bit weaker because of it. This is actual science and it has changed my life, starting 2 1/2 years ago. I have not once "cheated" as many say they do. I eat mostly meat, with the occasional vegetable or almond. God bless Dr. Fund, Dr. Barry, Dr. Berg, Thomas Delauer (however you spell that last name), for giving us all the free information, unadulterated by big sugar industries. We all need to be healthy, and these guys are some of the cornerstones of the food revolution that is to come.

  47. 14 months ago, I watched this video and it completely changed my world. I was a personal trainer for about 5 years and what I was taught was all wrong. I feel terrible for giving my clients bad advise. I lost 32lbs within the first 3 months and I've hit my body set weight and keep the weight off. I feel good, healthy, high energy, good gut, and have been told that I haven't aged. Thank you Dr. Fung.

  48. I was definitely headed towards type 1 diabetes watching Doctor fung watching dr. Fung's videos most definitely saved me from a life of pain and suffering I took his advice and I've already lost 20 lb and Lord my blood glucose and insulin levels just within two weeks I can't believe that this is all for free anyone out there I would take his advice this is a great and good man who who cares about people and if you just listen to him you can change your life some people would charge thousands of dollars for this information and dr. Fung is giving it to you for free so I suggest that you listen to him if you want to stay out of the hospital I used to eat 5 meals a day 500 carbs a day then I saw my neighbor in the hospital with a diabetic stroke he was a vegetable and that was the turning point for me now I do 20 carbs a day or less just in two weeks I've already lost four inches in my waist also on the keto diet thank you dr. Fung

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