Dr. Jason Fung – ‘Therapeutic Fasting – Solving the Two-Compartment Problem’

so what we’re going to talk about today is really why intermittent fasting and low carbohydrate diets work whereas the calorie counters it just doesn’t seem to work right and the problem with the calorie theory is that it’s just like raw and because we don’t really understand obesity that’s why we can’t cure it right so I’m sure many of you have seen this show it’s called The Biggest Loser and it’s on North America it’s in Australia it’s everywhere right and what people do is they’re contestants that compete to lose weight and they get put on a diet it’s a calorie reduce diet and they do a lot of exercise and you’ve seen jillian michaels screaming at everybody right so it’s a lot of exercise and they don’t show it on the show but there’s actually a fairly severe caloric restriction as well it’s not a low carbohydrate diet it’s more of a kind of everything in moderation sort of an approach so the problem of course is that this show has been running for a long time and certain of the contestants have come out and said well you know this really doesn’t work now the reason more haven’t come out is because they’re essentially under a legal gag order right they’re actually not allowed to say any of this stuff but certain contestants have actually come out and so this contestant Suzanne said well they never do a reunion show why they’ve all gain that weight again and it’s not it’s not unique to the Biggest Loser a lot of diets and we’ve all done these calorie reduce diets it does the same for everything it does fine for about six months but then after that it just keeps coming back your weight plateaus then it starts to come back and everybody knows this right because everybody’s done this diet the question is why right and that’s what we really have to understand and that’s what I mean by we have to solve the two compartment problem and I’ll explain that in a second so the Biggest Loser diet despite the fact that we all know it doesn’t work is actually ranked very highly so USA News for example just this past year put the Biggest Loser diet at number three for weight loss and number 11 overall so really a very good diet and why not it’s a eat less move more sort of approach right cut your calories in increase your calories out and hey presto you’re going to lose weight so that’s why it does so well because all the doctors recommended and so on the thing is that there have been some studies that have been done on these contestants and it’s very interesting to look scientifically at what actually happens to these people as they do this sort of eat less news more approach now the Biggest Loser of course is that approach on steroids rates or eating a lot less and you’re moving a lot more and that’s why you get these dramatic weight losses so one season they actually took these contestants made them signed consents and then actually did metabolic studies on them and what’s interesting is that at first it looks amazing right and we’ve all seen that show right the before on the after it looks amazing and the studies really bear that out so if you look at the before and after if you look at the composition of weight loss so at week six and week 30 at the end of the show is week 30 you can see that they’ve lost a lot of weight right this is 60 kilograms right and this is fat mass so most of it is fat right everybody says aw you’re going to lose muscle you lose muscle another losing mostly fat there’s a little bit of muscle loss but it’s mostly fat and this is their body fat percentage you can see it’s follows a pretty steady trend downwards and the average went from 329 pounds to 202 pounds so an amazing result right body fat went from 49% to 28% so at the end of the show you get these great results you have the end of the show everybody wins and they pretend like everything’s fine but we know that it isn’t and why not what’s the problem it sounds like it should work right you keep doing what you’re doing and you’ll keep losing weight but you don’t and the reason and we’ve known this for at least a hundred years is that your metabolism starts to slow down and this is what happened to the metabolism of all these contestants and you can see in the solid bar that’s their baseline rate of metabolism before they start at this and the open circles is that afterwards you can see that in virtually every case these people are cutting the amount of calories they expend by a lot okay so you can look at some of these dramatic examples so this fellow for example list starts out by earning thirty five hundred calories a day and he’s dropped all the way to about seventeen hundred calories a day right and it’s not just him it’s everybody if you take the entire group of people the average decrease in metabolism is over seven hundred calories a day right so if you start by burning thirty five hundred which is a lot so you start at two thousand you’re going to drop down to like twelve thirteen hundred by the end of the show so you wonder why you’re not losing weight well it’s because your metabolism has slowed down so much that if you’re burning thirteen hundred and you are eating 1,500 remember that’s still a lot less than you used to eat you’re going to gain the weight back that’s exactly what we all know happens you feel cold you feel tired if you’re hungry you feel like and the weight is going back up right and that’s the problem right we all know that’s the problem it’s the decrease in metabolism so you can try to make up for it with more exercise right and that’s what they pretend that you can do so you can see that baseline there’s a certain amount which is resting metabolic rate certain amount of exercise during the show they burn a hell of a lot of calories as exercise you see that the gram tops your total energy expenditure is better but when you stop exercising for like you know five hours a day then your exercise goes down but look at what’s happened to your basal metabolism this is your resting metabolic rate it’s already gone down by week six okay so don’t kid yourself this is happening all the time but by week thirty it’s gone down even or and that’s the whole problem you get this metabolic slowdown and because you’re not burning as much energy you don’t have that you know liveliness you don’t feel very good and you can see this in this graph you can see this is the Biggest Loser contestants and you see that the basal metabolic rate just keeps on going down but there’s a similar extreme measure that doesn’t seem to have this problem and the question is why so you can look at bariatric surgery so bariatric surgery is stomach stapling surgery right so you cut your stomach into the size of a walnut you really just can’t eat and you can’t eat for months and months and months and guess what the weight goes down right that’s not a surprise the surprise is that it works to keep weight off in the long term yeah there are a lot of problems with this okay so let’s be clear I’m not recommending it for anybody right but if you look at the resting metabolic rate with a similarly sort of extreme measure it goes back up the question is why so this is another study of the long-term effects of Bariatrics and you can see that a baseline and a follow-up this is several years later the resting metabolic rate and the total energy expenditure how much energy you’re burning has really not gone down right as opposed to the eat less move more where it keeps going down keeps going down until you fail right that of course is the saddest part of all right the saddest part of the entire thing is that we know about this metabolic slowdown this was shown in 1915 so we’ve known about it for a hundred years what I think is sad is that we give people this really horrific advice to eat less and move more and then when they fail we blame them for it right and that’s basically you’re blaming the victim because here’s this poor fellow or poor lady who’s victimized because they’re suffering from obesity from type 2 diabetes you give them really bad advice which you know is going to fail because we’ve all done it it fails every single time and then when the weight goes back you say yeah you should have listened to me better you should have had more willpower you shouldn’t have eaten that bagel or whatever it is you tell people right and that’s really the saddest part of all is that we try to pretend that the advice that we give is really good and the failure lies with all of you right but doesn’t doesn’t make any sense right how can like forty fifty percent of the population be so morally bankrupt that they let this happen to them is it not more logical that the advice that we gave was just really crappy that seems to me much more sensible so we’re going to explain why this sort of discrepancy exists so in order to do that you have to understand what happens when you eat okay so what happens when you eat is that insulin goes up so most foods almost all foods have a mixture of macronutrients fat carbohydrates and protein so your insulin goes up to a varying degree and insulin basically is the hormone that tells your body to store fat so it stops your body from burning fat you start to store some of the sugar and store some of the fat okay and this is normal this is a normal situation so carbohydrates get turned into glycogen which are chains of glucose so chains of glucose in the liver is basically a storage form of sugar okay and when you have too much of that then your liver produces lipids which is called de novo lipogenesis and it basically stores fat okay so when you don’t eat when you’re fasting so fasting is merely the absence of eating your insulin levels fall and that’s a signal to start pulling some of that energy out right so you’re going to start by pulling some energy out from the glycogen which is your stored sugar and you’re going to pour some pull some energy out of the stored fat so you can think of it the glycogen like a refrigerator right you’re storing food energy and the reason it’s like a refrigerator is that it’s easy to access so you can get put food in easily you can take food out easily right it’s just food energy and the fat is more like your freezer okay so you can store more of it but it’s in your basement you know it’s hard to get to it’s hard to get out it’s hard to put in so you generally prefer to use your refrigerator and it’s the same idea you have two storage forms of energy one easy to use and one not so easy to use the refrigerator though has a limited capacity so if you put if you have too much stuff you have no choice but to put it in your freezer now the reason that the calories don’t work is that they operate on what I call a one compartment model okay so that means they pretend that all your calories goes in to your body and it’s all the same all your calories are the same they’re stored in one giant compartment like this sink and when it comes to taking out energy it all comes out of the same thing right therefore if you follow this sort of very simplistic incorrect model what you see is that if you simply reduce the calories going in you’ll reduce your weight and if you increase the calories out you’ll increase the rate but the entire premise of this sort of calories in calories out model is completely fictitious because we know that’s not what happens in the body the body doesn’t have some giant vat of calories right you can store sugar you can store fat it’s not some giant vat of calories that’s held somewhere in your liver right but that’s what they all pretend it is so if you have the entire wrong idea of why this should work then it’s not going to work what instead is a better model is a two compartment model that is there are two places in the body where you can store food you’ve got your fridge and you’ve got your freezer your calories goes in into your fridge calories goes from the fridge because that’s the easiest place it goes but there’s a third thing that you have to consider and that is how much food goes back and forth between the freezer and the fridge because that’s what we’re really interested in this the fat but that’s the one that’s much harder to get to right and the question is what’s controlling this because that’s really the key and it turns out that the main player is insulin we know this because insulin inhibits lipolysis right what that means is it stops you from getting the fat coming out that’s a job that’s a normal job so if you have a lot of insulin right so normally if you eat a huge meal your insulin is high it’s going to tell the body to move all the storage in this way if your insulin is very high then you can’t get the food back out this way and that’s the problem so if you have a lot of insulin resistance for example which keeps your insulin levels very high it’s like that freezer is kind of locked away in the basement behind the lock you know steel bar you can’t get at it so what happens now when you start reducing your calories if you start reducing your calories in and you can’t get at your storage what your body is simply going to do is reduce the calories out that’s what it does right because it’s not going to keep losing weight until you die that’s just ridiculous right so if you look at the Women’s Health Initiative which was a huge fifty thousand person study they reduce calories by 350 odd per day for like seven years and they estimated that people would lose 30 pounds women would lose 30 pounds per year right so in seven years they should have lost 210 pounds right of course that didn’t happen how much did they lose not even a single pound it was ridiculous because what happened of course is that their body is if you’re not affecting me in insulin you can’t get at that fat you’re just going to reduce your calorie though and notice here of course that we’re not breaking any laws of thermodynamics right calories in calories out yeah you’re accounting for all the calories but what’s important is the compartmentalization of energy right that’s what we’re talking about not the total energy but where it goes right because that’s what we want to know if you eat and you just burn it off who cares that’d be great but if you eat and all of it goes into fat well now you care a lot right but it’s not that calories are imbalance if you eat an extra 500 calories your body burns it all off as Fat Bob burns it all off as heat yeah who cares you don’t have any extra body fat but if you get 500 extra calories boom the insulin is telling it all to shunt into here well that’s a problem and that’s really the problem of the two compartment syndrome so if you look at what happens during fasting what happens because everybody worries about this right Oh what about protein you’re burning your muscle right so this is a study by Kevin hall from the NIH and he basically looked what happens during fasting and this is what happens right so for the first couple of days of fasting what you see is that carbohydrate oxidation goes off it goes way up right in other words you’re burning sugar you can see that fat doesn’t actually move for a couple of days you’re not burning a hell of a lot of fat right and then as you run out of the glycogen remember that the glycogen is you’re easily accessed energy but limited in terms of how much you can store once it all burns out then look fat oxidation goes off now you’re burning fat for energy that’s perfect that’s exactly what we want to do but what happened to protein are you burning muscle hell no it goes up slightly okay at the very beginning then drops so protein is not a storage form of energy why would your body burn it for energy right you hear this argument all the time you’re going to burn muscle right so it’s ridiculous right because you’re telling me that the way we’re designed is to store energy as fat but when the chips are down we’ll burn muscle right okay like I don’t think so right it’s like if you have a wood-burning stove you store firewood right because you’re going to burn it but when the chips are down you don’t you chop up your sofa and throw it into the fire right it’s crazy the other thing that’s ridiculous is that if you have repeated fast famine cycles like cavemen might have had for instance so you store fat burn burn muscle right so at the end of a few of these cycles you’re like one giant ball of 100% fat right it’s like that’s what happens to the Bears right it’s like come on don’t be ridiculous you don’t burn muscle protein yes you do need a certain amount of protein to maintain your lean protein right but it’s not increased that’s my point it’s not that it’s not zero there is some right but it’s not increased in response to fasting so the reason that I talk about fasting and low carbohydrate diets is that what it does very effectively and probably more effectively than any other intervention is it empties out that fridge right and remember what you want to do is get rid of all that insulin – right because now if you don’t have insulin telling your body to shunt all that energy into fat now you can start to move your calories out this way right if you have a lot of insulin so we do this for example if if we give people exhaustion as insulin they can’t lose weight right even if they fast it’s very hard because they can’t access that fat they just keep reducing their calorie expenditure but the whole point is that fasting provides the easiest way you get rid of all that glycogen you got your insulin down so you can actually access your body fat and there and the whole thing is that why can’t you right you know I asked my son one time a few years ago you know how do you lose weight these goes here’s six or seven at the time and he goes just don’t eat so easy right it’s like huh how can you be so right about this point that has escaped like 99% of the world’s doctors and dietitians right if you don’t need you’re going to lose weight and here’s the thing to understand there’s nothing wrong with it that’s the way we’re built right that’s the way Lions are built its we tigers are built that’s what bears are built that’s the way we’re built we’re built to withstand these repeated episodes where there’s no food right because back in the caveman days there’s no McDonald’s there’s no refrigerator there’s nothing there there are times you’re going to have nothing that’s why you have fat right that’s the whole point so one of the most ironic things is that this is what you hear all the time fasting is going to put you into starvation mode right huh this is actually very ironic because starvation mode refers to the idea that your metabolism slows to such an extent that you’re going to regain weight okay so I’ve heard that before somewhere right that’s exactly what happens when you try to reduce your calories right if you don’t do anything about your insulin and just reduce your calories your metabolism goes down you’re going into starvation mode but what happens during fasting does it happen well here’s a study of four consecutive days of fasting right so this is in normal people right and what you see is that at the top the weight goes down right so that’s great that’s exactly what we expect to see but what happens to your REE this is this middle line here that’s the resting energy expenditure right that’s your basal metabolism it doesn’t go down it goes up right you’re burning more energy than you did now you might think why is that so well it makes a lot of sense because suppose again you’re a caveman and there’s nothing to eat it’s winter there’s nothing to eat right so if your body starts shutting down then you’re even less likely to find something to eat because you’re tired you can’t go out there and hunt a woolly mammoth you’re tired right you need to sleep so that’s gonna you’re all going to die like that right your body is just not that stupid right your body says wow you have nothing to eat so I’m going to give you energy I’m going to increase the amount of energy you’re burning and I’m going to provide it from your fat stores because you need to go out and eat and fill up this refrigerator again right so that’s exactly what you do otherwise we wouldn’t be here right it’d be like cockroaches and insects running the world so what happens to your vo2 right that’s how much oxygen you can metabolize right does it slow down no it goes up right again you have more capacity to do exercise more energy and why is that so one you’re burning fat for energy and your body’s like whoo there’s a lot of this right so there’s plenty of it let’s go but the other thing you see is that the norepinephrine so norepinephrine and epinephrine are called adrenaline or noradrenaline so your body is actually providing you with a big kick in the pants to keep your energy expenditure high because that’s what you need to do to survive so insulin drops which is one of the major things that we want to see and your hormone so that’s a hormonal remember obesity is a hormonal disease it goes up it’s providing you the tools to burn fat so there’s no starvation mode actually it’s quite the opposite it goes up you can do something called alternate daily fasting which is kind of one day of fasting one-off and in these studies is not actually a full fast so they still allow about 500 calories on those fasting day so it’s not even a true fast but the calories are low that you still get the benefits and you again if you look at the resting metabolic rate which is the first line you can see that from baseline to day 22 so you know a couple of weeks of alternate daily fasting your resting metabolic rate really hasn’t dropped your fat oxidation goes way up right so you’re burning fat you can’t argue with that right you can measure these things you’re burning fat why because you have no carbohydrate to burn right because you’re clearing out that fridge you’re clearing out all that storage sugar and burning fat that’s great that’s exactly what we want do the other thing we talked a little bit about already is that you’re going to burn muscle right and again the idea is that here you’re going to burn protein to provide glucose right and this doesn’t actually happen and this has been known again for 20-25 years so if you look at your reah reah is this big line camp so it’s a breakdown product of protein so you can see that you excrete a certain amount of nitrogen every day you’re also taking in a certain amount of nitrogen every day right this is under normal conditions now you fast people like you just give them nothing to eat well what happens well there’s virtually no you’re really out right now there’s nothing going in to but what you you notice is that you’re not burning muscle because if you’re burning muscle that urea should skyrocket or at least be as high as this your body is actively conserving your protein your muscle mass right and that’s what happens during fasting and you can do 70 days of alternate daily fasting right so 70 days is more than two in a bit months and what you see is that if you measure fat mass and fat free mass in this study you can see that fat mass goes down very nicely from forty three point five to thirty eight point one kilos and the fat free mass your lean mass doesn’t move at all so these are sort of some of the myths that everybody tells you right servation mode burning protein and here’s my favorite right it doesn’t work that is never going to work right it’s like okay genius if you don’t eat do you think you will lose weight right well yes you will right so it’s not exactly a very good comeback for people to say it won’t work because it will definitely work okay it will definitely work I’m not saying it’s easy okay that’s a whole other thing can you do it that’s a separate question I actually think that most people can do it but if you are able to do it yes you will lose weight right and here’s the thing so back in the 1960s they have done a bunch of studies on these patients and what they did was they admitted them to hospital they did that back then and they just watched them and you can see that people lose weight and here’s the thing that always says people are goes oh how about women women shouldn’t fast like why not don’t you think you’ll lose weight yes you will now if you’re underweight then yeah you shouldn’t be fasting right you’re going to get a man areia you’re going to get menstrual problems but if your need to lose weight yes you will lose weight and that’s exactly what they found in all these studies so you have men they lose weight women they lose weight right and what you can see that it’s fairly steady there’s no kind of drop-off right there’s no drop off that kind of dreaded weight plateau because that’s the whole problem with weight regain is that we all plateau there’s so many advantages to fasting that are just not available in that it’s completely different from most other diets which tell you what to do because this is really the opposite it’s something you don’t do right so one of the biggest advantages is really that it’s completely simple you can explain it in like two seconds and everybody understands intrinsically what it is right now there are variations right there’s fact fasters juice fasts there’s you know water-only fast there’s no water fasts there’s all kinds of variations but at it’s very core it’s easy to understand and that’s important because if people don’t understand what you’re trying to do they can’t do it right it’s free like you know as much as I would love to always eat home-cooked meals and you know long simmered bone broth the truth is that most of us sometimes don’t have the time and don’t have the inclination don’t have the money if you want to eat grass-fed beef every day it’s going to cost you you want to eat organic all the time it’s going to cost you not saying that you shouldn’t but it’s expensive and some people just have no money so I have people who write me from the Philippines and they’re like you know I got all this stuff and I can’t afford anything it’s like well there is no cost there’s no cost at all it’s convenient right so again you can cook all you want but it takes time right it takes time and sometimes you just don’t have the time but this one there’s no shopping there’s no preparation there’s no cooking there’s no cleanup there’s no eating right there’s nothing it’s so convenient because again the key is it’s not something to do it’s something to not do right and that makes it completely different in sometimes something that you can add something that’s completely flexible right so it’s not like oh yeah you need to eat six times a day right it’s like sometimes you just don’t want to eat a snack today sometimes you’re busy right well this is going to give you more time you can put it in anywhere you can do it tomorrow and you cannot do it the whole next week and then do it again right you can do whatever you want it’s completely flexible do it for 12 hours you could do it for 12 days right it doesn’t matter and really the the point is that you can add it to any diet because again it’s something that you can put in and fit in wherever you need to right so say you want to eat the you know the rice diet or something like that you get still fast right that’s the whole point you don’t eat meat you can still fast right you don’t eat wheat you can still fast you have a nut allergy you can still fast right you don’t have time hey you can so fast you don’t have money you can still fast you’re traveling all day you can still fast right you know cook yeah you can still fast right and probably the most important thing is that it really has unlimited power right and it’s a doctor sometimes you get into these things where you want to do something and it’s not strong enough right well you can just keep fasting until you get the results you see as I said if you don’t eat you will lose weight right you’re almost it’s almost impossible to not write can you keep it up that’s a separate question right I’m not saying it’s easy I’m not saying that I mean you do have to have the proper medical supervision especially if you’re on medications so on but you could fast you could fast I have a 75 year old who did like 30 days right you felt great right the world record is 382 days you can keep going right and this is the whole point is that this gives you options because it’s not a diet it’s no diet it’s nothing right it’s like Costanza to show about nothing right there’s a talk about nothing right Georgie stands us so smart that’s the whole point is that because it’s the opposite it gives you so much flexibility and it has the ability to really free ourselves so the chains that bind us down right we have all these problems right the number one problem in the world today right you got heart attacks you got cancer you got strokes you got diabetes you got kidney disease and it’s all due to obesity it’s all due to diabetes but yet we have the ability to free ourselves from all of these modern afflictions right only with the application of a technique they new 5,000 years ago the ancient Greeks were all about fasting not for health they didn’t have a lot of obesity back then but because it gave you energy gave you like mental focus right that’s why they did it and these involuntary periods of fasting eventually got taken out right as we started getting more reliable food then religion started introducing periods of fasting right so if you look at any major religion in the world they have periods of fasting their periods of feasting – that’s balanced by periods of fasting right I remember that they’re not trying to kill all their practitioners right not like oh you should fast you’ll die haha that’s not it at all right it did it because there is something deeply intrinsically beneficial to the fasting right and it was always known always it’s a cleanse it’s a detox right there’s probably only one thing that the three most influential people in the history of the world agreed on right so the Prophet Muhammad Jesus Christ and Buddha they all agreed on one thing and that is fasting is very beneficial it’s uniquely beneficial not only for the spirit but also for your body we need to clean ourselves out of this junk that accumulates right all this extra sugar all the insulin all the fat we need to clean it out once in a while right it’s a spring cleaning that’s all it is and yet with the application of this kind of ancient time-tested technique we can break free of all this right you know in the last century we broke free of a lot of infectious diseases right tuberculosis pneumonia and all this and now all that replaced with was all these diseases but we have the knowledge we only have to apply it and that’s the most ironic part of all we won’t but there’s no reason why we won’t we’ve always been told by everybody that we have to do that and yet why do we not my son knew it any questions we have a couple of minutes left thank you very much


  1. Every time I hear him I learn more. And just to reinforce his message. I reversed Type 2 diabetes through low carb and intermittent water only fasting. Also I had under active thyroid and I am now off the thyroid medication and my levels are normal ! In the UK (maybe world wide ? ) Type 2 diabetes is diagnosed as 48+. Pre diabetic 42-47. Normal is 20-41. In October 2017 my HBA1C test showed an underlying blood sugar level of 65. By June 2018 it was down to 40. It went down to 37 by December 2018. It did go up is 39 on July 2019 when I stopped the fasting. I am now back on fasting and feeling great ! I want another test in October to make sure there is nothing else wrong. This man is my hero ! I have non alcohol related fatty liver disease. I am hoping that this is reversing as well, but the doctors are reluctant to do another scan. My moods have improved as well, also my capacity to learn, and my memory has improved. I wish I had known about this years ago !

  2. Can anyone explain why there's such a difference between fat oxidation and carbohydrate oxidation between days 21 and 22 at 25:00?

  3. I have been on Keto about 3 months. (Historically I was a big eater and drinker) I just completed my first extended Fast. Five complete days fluids only. I couldnt believe the lack of serious Hunger Cravings. Next time 7 Days!

  4. Also I fasted on water for 2 weeks several times and NO, energy do not increase. You getting weaker and weaker every day.

  5. I did a couple of multi-day water fastings. Works like a charm and isn´t that difficult. Plus, your brain clears up significantly once Ketosis kicks in.

  6. If you fast, the great industrial food industry will get less profits to pay their CEO's millions in revenues by the end otf the year. So, it is not recommended.

  7. I stopped watching this video at about minute six, due to the offensive cursing! I am frequently surprised that seemingly intelligent people will insert unneeded/unwanted cursing, into an otherwise thoughtful, helpful, video.

  8. I always said I wish there was a pill that would substitute for eating in order to lose weight, not having to think about food. As a Muslim, I have never had any trouble with our yearly 30 day sun-up to sun- down fasting. Keto plus fasting is my longed-for magic pill!

  9. I need to fast. My poor body…what I’ve put it through, trying to lose weight, year after year after year 💔

  10. Mylife has been horrible for the last 10 years of having diabetes. From depression to trying to drink myself to death for years. Been in and out of hospitals with sepsis,utis, gross stuff happening to my body. Leaving ally friends and family out of my life so they don't see my like this. I thought life was over. Then I saw a guy named David goggins on Joe Rogan podcast. He's a real life superhero I say this people he's saving mylife one day at a time. One month ago I said to myself I want to live. I was 275 iam em now going to the gym twice a day and doing intermediate fasting and iam now 245 working my butt off. It's a struggle I fall off once in a while then I remember what David says people only are using 40% so I go at the gym tell I can stand it's working thank you to these people like Dr. Here and David goggins, Joe Rogan for giving my another chance in life.

  11. Great information, except for the part where he implied that cockroaches and insects are NOT running the world. The policies and proclamations coming out of most national capitals do not seem to be biased in favor of human beings.

  12. Medical science has become a scam in much of its practice. Let's spread the word and help the real doctors! Let us isolate the salesmen disguised as doctors!

  13. Not easy to starve yourself. So now we are back to blaming the victim. What happened on fast day 382 that he didn't go to 383? How is restricted calories different than fasting? What about the inability to control appetite, my fault? Okay I get the compartment partition problem but what about hormones re appetite? I hurt, if I don't eat and I have pain, I could go for the record at 383 cays. Lets go….but how do you keep me from breaking my restraints and eating a nurse? Fat people should not have hunger and that ya'll don't address that bothers me. Lawson di Ransom Canyon any analyst could find me. Peace.

  14. this guy is really good… i love his simplistic way of comparing a refrigerator and a freezer… and it makes such perfect sense…

  15. will fasting every other day also help lower my blood pressure. I am looking for natural ways to lower blood pressure without medicine

  16. This explains how I was able to lose so much weight a few years back. My eating window was only 4 hours long. From 2-6 pm. I lost over 100 lbs in about a year and a half.

  17. Thanks GOD for the YouTube channel and the messages from Dr Fung regarding fastings the best cure for diabetes.
    This is amazing knowledge for the ones who have an ears to hear.

  18. thank you dr fung for this wonderful information about health.. i tried this because of my health since i gave birth to my baby and he's died after i gave birth beacause of my higblood,increase also my sugar and difficulty of breathing now i get better almost 4days fasting and i will continue this lifestyle because i want to live long and wishing again to have another baby in the future now i realized health is wealth tlaga lalo n pg namatayan ka ng anak dahil sa wlang desiplina sa pgkain kya ako ngkaroon ng highblood now i suffering heart disease but thank you dr fung now i feel better because of you.. love from Philippines 🙂

  19. People that are not on keto and diabetic or pre-diabetic need to watch their sugar levels carefully the first couple of weeks! I thought that's one thing he should have had in the video. Before on keto I almost passed out while driving I'm a second or third day of a fast, needed to get carbs fast, didn't know any better at the time, chose a candy bar.

  20. Dr Fung said "Right" 152 times in 36 minutes. That's 4.22 times a minute. He threw in a few "like" and "ok" used in the same way he was using "right." It's unnecessary and extremely irritating. Other then that it was an interesting talk. 🙄

  21. THNX FOR SHARING, Mmmm, I am too thin and had always the opposite problem than the fat people have! But I cannot have breakfast at the breakfast time! So I eat around 12:00 or 13:00 hs every day and then have 2 meals, and if I get hungry again I try not to do it after 20:00 hs., and if I do not eat bread, milk products and suggary stuff I feel just great! If I eat bread it will charge me with 3 days of deep tiredness, JUST 1 PIECE OF BREAD OR 1 CAKE!! It is too expensive, so I am not eating it, milk products and suggar included, and grains, nooooo, not anylonger!

  22. I have often heard proponents of fasting talk about cavemen diet and the fact that Hunter gathers would have had periods of enforced fasting, but the truth is there was shortages of food for many people in the western world right up until the mid twentieth century. I am a farmer and I am Irish and I know that food shortages were common all through the nineteenth century even leaving aside the devastating famine of the 1840s. There are also times of the year when farmers stores were bare. Complete food security is something new and even today is not a reality for everyone on our planet.
    Thanks Dr Fung

  23. Metabolism nonsense. Yes a person who loses 200lbs will need less calories when they weigh 150 lbs. Metabolism slows down .it's not a bad thing. Yur not going to be able to eat the amount. Get over it.

  24. I've never believed in "weight loss diets". They don't work. It has to be a lifestyle change, a new lifetime way of eating. I have gone back to the way we ate when I was a child and weren't so "good-off" as most of the people where we lived. 2 meals a day on weekends and during the summer, during school it was 3 because we got lunch at school, little to no sweets, no processed foods. One Sunday a month everyone fasted from Saturday night until 6pm on Sunday when we had a small meal. My family made their own bread, made meals from real unprocessed food and we cooked with lard and bacon fat!! Now I've found that the Ketogenic "Diet" is basically the same thing that I lived with as a child and am doing now. The only thing I have changed from then to now is I'm not eating grains and cooking with bacon drippings or lard again instead of Crisco and using real butter instead of margarine which I did for decades after leaving home. Strange how things come together sometimes. Although, unlike in my childhood where I didn't have an addiction to sugar, I struggle with that craving very much every so often these days.

  25. Hello, I was just wondering if someone suffering from lupus can be heal with water fasting? If yes what king of water fast do you recommend? Thank.

  26. I have now changed my medical practice to include intermittent fasting as a way to manage overweight & obesity, diabetes & fatty liver. I'm met mostly with skepticism by most of my colleagues. It's disappointment. We've been treating these medical problems incorrectly (promoting low calorie diets) and it's high time to change.

  27. For me i am good to fast for a while, but after a workout, or a long day of work, I'M REALLY HUNGRY. any tips for that? also, i feel like if i am working all day, i need food to give me energy to work, or to replenish myself. is that logic fair? or am i just making excuses?

  28. I LOVE Jason Fung and agree 100% with his arguments, but I gotta day he says “…right?” wayyyy too often during his talks. When he talks like that, he’s pretending that your agreement with his argument is a foregone conclusion, RIGHT?

  29. He is spot on with 99% of this, but he is definitely wrong about burning muscle with fasting. I do and most people do unless genetics are good at avoiding that.

  30. Carbohydrates are addictive. It is so hard to get away from processed, carbohydrate food, but it can be done. As an experienced low carb dieter and intermittent faster I know the dangers of carbs.

    Carbohydrates cause hunger pangs, protein and FATS do not. Start on a low carb diet meat, fish, cheese, etc for four days or so to achieve ketosis. Once in ketosis it is easier to reduce food volume because hunger pangs aren't as bad and don't last long. Then start on intermittent fasting. Start fasting after supper, sleep through the night and fast during the day for as long as possible. A busy schedule will make it easier to overcome the lunch and break habits. Instead of eating for lunch, go for a brisk walk.

    Distraction techniques work if the habit and compulsion to eat becomes overwhelming. But avoid carbs, eat proteins and fats. Take multivitamins. After a week start eating greens. A great substitute for pasta is cabbage cut into thin strips as a base for meatballs or bologniaise sause, or use whole cabbage leaves for lasagne.

    No one is perfect or superhuman, so expect to fail. Be gentle on yourself. Pick a new date and start again. It gets easier over time.

  31. Love the preaching scientist makes a lateral straight into philosophy and morality. Just stick to what you're good at Dr

  32. Fascinating… until he brought Mohammed, Christ and Buddha into it. What a BS statement in otherwise excellent presentation.

  33. Greetings.

    I've read many positive comments, and congratulations to all whom are benefitting.

    If I may say this very respectfully…as "fasting" is a common talking point.

    Does not the "Holy Bible" talk about fasting?

    I'm not pushing any agenda…only in my opinion there's many "Truths" in this beautiful book.

    Have a great day/week ahead.

  34. Okay so low calorie is bad and slows the metabolic rate. So what do we do?? Doing the fasting this is awesome but that’s just less calories?? Right so how is this going to not slow it down? What do I do? Do I try to get a bunch of food in the time period? I’ve been doing the 18:6 fasting. But sometimes I end up just eat OMAD. But I’m just eating 600 calories sometimes. Is that bad??? Am I going to screw up the metabolism right is it just going to work out fine since I am only eating the one time?? I love the fasting idea I just feel like he doesn’t tell you what to eat to keep it away??? Anyone? Did I just miss it?

  35. Well i been eating once a day for 30 years, and carbs make me feel sick and guess what my Lipedema just keeps growing. For me eating once a day is like other people eating 3x a day. Its so normal for me that it makes 0 difference to the way i feel or my body. I really wish they stop generalising and saying it works for everyone. There are people who have a Fat disorder which is genetic and no matter what they do it wont go away, because they have sick fat cells.

  36. I’m glad I saw this, I’m going to keep this simple equation in mind and fast more often, but I did lose a lot of weight a few years ago but my legs was already kind of skinny but that weight lost left them looking like toothpicks. All my fat is around my waist, are you saying that was fat that I lost on my legs and not muscle. I just have to be more disciplined and patient. I know counting calories is useless. I’m 67 and diabetic and RA, the steroids I take is keeping my sugar a little high. I love the simple way and illustrations you use. Jesus fasted for 40 days and that’s my leader. Great inspiring talk. Thanks

  37. I used IF to lose 3 stone I went to see the doctor after reversing pre diabetes and guess what he told me "EAT MORE" not eating isn't practical. lol

  38. If you loose wight your body needs less calories then before to maintain itself. It doesn't mean that you're slowing down your metabolism (temperature goes down etc).

  39. I would appreciate some help here from the specialists in intermittent fasting. Dr. Fung says that less calorie in will decrease metabolism and our body will adjust to the less calories coming in. When we dont eat, would that not slow the metabolism even further? Please help me understand. Also do you not feel hungry when you fast for days? Thank you for helping to answer these layman questions !

  40. A doctor I had recommended keto. Went so far as to print quite a bit of literature and links to various research. Said it saved his life. And frankly, after losing 50 pounds myself, I can say he was right.

  41. When you start out fasting you will get agitated, and even feel a little sick, because most people are used to eating 24/7. Once your body starts to adjust, after 16 hours you will start to get less cravings, and you will get less hungry as your body is now programmed to burn fat for energy. When you feel like having a snack drink a little water that should help some. The you start to get slightly more clear minded. People in for example america will have more problems, since they are used to sodas, alcohol and hamburgers and other snacks. They are basically addicted to the sugar.

  42. What if you fast for 24 hours but eat a meal of 3000 kcal each time when your basic metabolic rate is at 2000 kcal? You will still gain weight right? And also, what about when people want to gain weight (muscle)? You still need to count calories right?

  43. Hahahaha — I love this guy.

    He has an irrepressible compulsion toward honesty in a Germanist society which, of course, despises anything but strictly superficial facade and then brutally piggish lyinf, bullying, and coercion when that, also of course, fails.

    Best of luck, Dr. Fung — you're going to need it in the utterly corrupt, blue-eyed, bratty West.

  44. If you are morbidly obese can you expect to lose weight pretty immediately? I thought so but it doesn't seem to be the case, I've tried a couple times for a month and nothing happens.
    *I do the 16:8 approach…am I just so insulin resistant that it's going to take a long time?

  45. Thanks for info Dr… I am not fat and maybe a little skinny but if I don't eat at certain times, I sometimes tremble… Does it mean I am insulin resistant? I am just trying IF to stay healthy, not to lose weight. Thanks in advance.

  46. Fasting for 24 hours every 2nd day and giving up toxic grains sugar and dairy saved me. The cravings have eluded me and I’m so happy.

  47. The 1300+ dislikes are 'doctors' and pharmaceuticals prescribing drugs to 'reduce' insulin levels 😂 … nope not me thanks.

  48. Hi if you�re reading this, Just enjoy life, smile more, laugh more, and don't get so worked up about things

  49. By far the best, most straightforward, science-backed conversation about why conventional dieting never works.

  50. For me when I fast 3 to 10 days i am always very tired , my body just wants to lay down. Also I get terrible heartburn, sometimes I even have spit up and out the extra stomach acid ,the only thing that helped was to drink purified water that has nothing in it.

  51. Hey, I would love someones help–
    I am using Dr. Fung's 'Therapeutic Fasting – Solving the Two-Compartamental Problem' as a source in my English 102 research paper:
    1. If I regularly go to bed about midnight and don't eat until 2-3pm the next day, is that 'technically' beneficial fasting?
    2. I would love to know any questions you all have on fasting in general? Comment them for me : ) maybe I can do a deep dive and answer them in my English paper!

  52. It’s Vedic practice to fast, Buddha rigorously promoted it- till my grandparents they fasted; then India got “modernized” .

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