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

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


  • TheIgnobleSavage says:

    Is it true thouhh that if you want to gain muscle though you need a calorie surplus?

  • Scott Jones says:

    Excellent 👏

  • TheHolySC says:

    All those diet scams out there WANT you to gain back the weight after you are done so they can resell it back to you. Fasting is free.

  • Let'sArt says:

    Would Keto, fasting, or carnivore diet be best for a 5'7 169lb 27 yr old scandanavian female who's had two kids and is moderately to not very active on a daily basis? I want to try keto or carnivore and fasting, but I don't want to do something that isn't right for me.

  • Brenda Bogowith says:

    Sooo..all those anorexics who weigh 78 lbs..where did their muscle go? You will tap into muscle once your fat is gone.

  • ScienceGuy says:

    Why doesn’t this work:
    – decrease calories into the fridge (calorie restricted diet).
    – energy from eating isn’t sufficient for the day’s activities (including BMR).
    – extra energy from the freezer (fat) is required.
    – decrease fat over time.

    Restricting the calories you eat should force your body to use fat to account for the decreased energy in the ‘fridge.’

  • AVA DEA says:

    "the calorie-theory is just like… wrong" 😆 made my day!

  • mike c says:

    Your enjoyment of food will go to a new level when you do this. Since I am only eating once a day when I'm fasting I like to break my fast with something delicious. The $12 strip steak with fresh asparagus. Slow-cooked pulled pork. A nice fresh chef salad or antipasto. Chicken wings. Filet mignon. Looking forward to that all day really helps and eat as much as you want.

  • AK Henderson says:

    If you don't have health insurance.. just Subscribe!

  • Football Investors Club says:

    I am also someone who has benefited greatly from this knowledge. I went from 273 lbs to current weight of 212lbs in a little over 6 months, basically fasting 15 hours daily & removing sugar from my diet & exercising 10,000 steps daily. Drank more water, added MSM & Vitamin C to my drinking water as my only supplements.

    I take no medications and feel healthy all day, everyday. I expect to be my ideal weight in 3 months time and stay there. It is really quite easy to do. Wish I knew it when i was younger as i am 51 years old but better late than never. If you are reading the comments and haven't tried this already, I highly reccomend it.

  • andrew elliott says:

    Makes total sense to me

  • Black Lighting says:

    the truth will set you free

  • Black Lighting says:

    i could probably turn my fat into about $2000 and avoid a couple doctor visits….

  • MrA says:

    I don't really get the message hear. That the body doesn't burn its stored calories?

  • Alan Kropp says:

    Thanks doc. I'm on day 5 of a 7 day fast. I appreciate your input.

  • Benji says:

    It's been a little over 2 years since I started IF, with a bit of a bumpy ride in-between. But, I have lost a little over 75 pounds. I want to thank dr Fung from saving me from obesity and all the health complications that it causes. Best doctor.

  • Sage says:

    man i love this dude. hes just like so exasperated and tired of this false info like sigh welll.. no.

  • Mark Soni says:

    Very thankful for this video. Very insightful.

  • Katherine George says:

    I found autophagy in the bible Matthew 9:17:

    14 Then John’s disciples came and asked him, “How is it that we and the Pharisees fast but your disciples do not fast?”

    15 Jesus answered, “How can the guests of the bridegroom mourn while he is still with them. The time will come when the bridegroom will be taken from them; then they will fast.

    16 “No one sews a patch of unshrunk cloth on an old garment, for the patch will pull away from the garment, making the tear worse. 17 Neither do people pour new wine into old wineskins. If they do, the skins will burst; the wine will run out and the wineskins will be ruined. No, they pour new wine into new wineskins, and both are preserved.”

  • zafar Khan says:

    As we are aware that Muslims fast during their Holy month of Ramadan. These 30 days fasting is very beneficial and an ample proof of truthfulness of Islam. At least 30 days fasting in a whole year is good for health from medical perspective.

  • 49jubilee says:

    Not just caveman days.
    How about 175 years ago

  • jeromie89 says:

    Interesting thoughts about the RMR changes before and after weight loss. Isn't it true that the bigger a person is the higher their RMR as their body will need more calories to survive/function? So the RMR will be lower for someone after weight loss?

  • Constantia de Gier says:


  • Amy C says:

    I started fasting 18 hours with a 6 hour eating window. I like it. Tomorrow is day 10. I’m calm and happy and I feel better. That stuffed sausage feeling is going away. I take quality supplements and eat quality foods. Nothing processed or refined. I felt like poop for such a long time. It’s really sad. Time to heal. Hallelujah!

  • Kane6676 says:

    Fasting is the only way for genetically fat people to lose weight. The problem for many of us is that the body wants to be fat. Even on low calorie diet the metabolism will slow to hold the fat. Diets don’t work. Excersise does very little

  • Hally Tomasheski says:

    Oh my goodness. What sense this makes to me! Where has he been for all my life?!

  • Jerry Cummings says:

    What a charming young fellow – one who exposes the truth in a wonderful sort of way. Appreciate this presentation very much.

  • Keep Calm says:

    I m fasting 5 am to 7 pm a month in Ramadan. I feel healthy.
    After that. I fasting every Monday and Thursday per week. No more diabetes. Thanks God.

  • Madonna A Madonna A says:

    Il a toute a fait raison! Moi je suis maigre et je veux rester toujours maigre! Le jeune et la meilleur chose, et quand ont dois bouffer, c est nos fruits et legumes: j ai lu le livre du Dr. Fung et c est le meilleur livre, les medicaments sont des vrai poison, ca nous rend malade, et ses escros veulent nous rendre malade, si ont ferai tous comme le Dr. fung ont serai tous en meilleur santé, et ses companies de pharmaceutique feront faillite, c est rienc le profit qui les interesse et pas notre santé! vive la Naturopathie ! et un gros merci au Dr. fung

  • Donald Leske II says:

    I have kidney partial failure and have gout. I am told by my doctor to drink lots and lots of water, adopt a vegan keto diet and eat kale, ..plus at 310lbs I must lose 50lbs ASAP. In 10 days I am down to 293lbs. Will fasting, especially water fasting harm my kidneys?

  • Bunny Biedenharn says:

    Great to see an actual MD (and one who was good enough for Cedars-Sinai, which is a big distinction) saying these things. From one chart, it's good to see that a dedicated adherent can basically bank on losing 24 pounds of FAT per year – which amounts to three waist sizes. From the graphs, I see that even between Day One and Day Two, good things begin happening. So, am I to assume that a couple on a strict KETO/OMAD diet (only the carbs which come with nutrient-dense raw vegetables/high fat/moderate protein – with absolutely NO insulin-triggering beverages between meals) can accumulate, in increments, a similar fat loss, over a year, even though our fasts only last 23 hours?

  • R0dan says:

    Very interesting. I have been following intermittent fasting for two + years after listening to Dr. Rhonda discuss this subject. After listening to this lecture I tried my first 48 hour fast. I am at the end of the fast and the unexpected result is…I am not the least bit hungry! My take away from this is do not jump into an extended fast as you are doomed to fail. Start with intermittent fasting/ restricted eating then ease into the extended fast. Next month I will try for a 72 hour fast.

  • Dark Rainbow says:

    The Nobel Prize for 2016 went to a doctor who studied and advocated fasting. The establishment isn’t trying to hide it. People just love donuts.

    Be an individual and stop loving donuts. Then go fast.

    Alright, that’s my slogan now. “Go fast!”

    Here’s another one: “Live fast and die never!”

  • B R says:

    Is adaptive glucose sparing real? After 2 years on quality keto,IF, OMAD, HIIT, my blood sugars are 200-270. Why am I still diabetic? 61, 20+ years T2D diabetic. Lost 70# first year but none 2nd. Why? Need to lose 30 more.

  • 趙苡婷 says:


  • D.J. Martin says:

    I hear that so much..
    "If you fast you are going to lose muscle!"

  • Ada Ravon says:

    why does .contrary to your claim my blood sugar rises in fasting

  • Ujjwal Jain says:

    This was a very good talk. But I'm wondering what happens to the compounds that our body can't produce itself like essential vitamins and proteins. If we do not consume them from food, won't that affect our health?

  • Broughtolife says:

    I took myself off insulin after discovering Dr. Berg on yt. Thank God! My primary at the time was telling me it was ok to drink half a glass of orange juice in the morning. My A1C went down from 8.4 to 5.5 in 3 months, and I lost 50 lbs in 6 months. I sadly got off keto, but restarted 2 months ago and I'm down 20 so far.

  • TheEmmaLucille says:

    Dr Fung est tout simplement génial.

  • John Smith says:

    I would love for him to do this speech to a room of nutritionists and personal trainers, with the camera on them. Not that it is their fault, they have just haven't been properly educated. But it would be funny to see

  • finnmacool says:

    he is brilliant …and this information can change your life.. I urge people to listen to him.. heed his advice .. I feel so blessed to have come to know about fasting .. I was fat and sick for about 15 years … i have been fasting for the past 7 months and I'm healthier and lighter than i have ever been

  • Mahesh says:

    Can someone explain how is this any different from Atkins diet ?

  • YB E says:

    Yes it does work, keto and IF helped me shed 90 pounds! No hormonal issues. Only positive results!

  • YB E says:

    Jews don't fast for cleansing reasons we fast as a form of mourning or repentance. But I do agree that the side benefits are great.

  • Sadie Tuescher says:

    How can you go low carb as a vegetarian? (I don't like meat, in fact, I hate it).

  • Nicole S says:

    I have been fasting and love it, but what seperates regular fasting from eating disorders like anorexia? I ask because I have friends who suffer from it. One has almost died several times

  • Dietitian Ny Fahaverezan' Ny Vesatra says:

    your voice is so relaxing i think it is perfect

  • sue thomas says:


  • Chrystal Powell says:

    This is so informative.

  • Devorah BatMiriamGoldaVMordecai Bayer says:

    Many of us who are compliant post bariatric rn y did not haveany benefits and are now meeting with success on Keto.

  • Lakshya Choithani says:

    Hi sir once we loose weight how We r supposed to maintain

  • Shenandoah says:

    I'm on day 2 of a 7 day fast. I've been on keto for about 5 months, but still struggling because I still crave sugar and have given into the urge to binge on ice cream too many times. My binges are much less frequent, but still too often. I'm trying to reset my system and after my fast plan to do strict keto with no keto treats, no alternative sweeteners, not even berries. I still have about 80 pounds to lose.

  • mike Jones says:

    His teaching is from past teaching but its helpful because we never know about this way of healing. So it's TRUE everything repeats itself

  • Night Knight says:

    From one physician to another, Dr. Jason Fung knows what he's talking about, (even though he cheated off of me during medical school examinations…joking of course). I've not changed anything about what I eat, simply when I eat. Started intermittent fasting 6 days per week on a 18hr fast / 6hr fed window and have lost 70lbs in 4months. Now my wife thinks I look too much like a ripped body builder. The food and pharm industries don't want us doing this because there's no money for them in it. It works with a bit of discipline and self restraint, the 6hr eating window removes nearly all snacks from your life. It works great and costs absolutely nothing…yup even doctors like to save money and time!

  • James Broffardski says:

    "THAT would just be RETARDED" – jason fung, m.d.

  • Leo Joseph says:

    Thank You Dr Fung for this video. I started fasting daily for 12-15 hours this month and it has helped me lose a few more pounds. Which fasting period is the most optimum or effective?

  • Andras Libal says:

    The problem with the calorie theory is just that it's … WRONG :))))

  • Gerald Manley says:

    Just like bears

  • A A says:

    On my 4th day on a water fast, never felt better and that's coming from a glutton

  • accitenor says:

    I bought his book, 'The Diabetes Code' two weeks ago and started fasting 17 hours a day (I eat from 10am to 5pm). My blood sugar has dropped 20 to 30 points both before and after meals!

  • Mr.Sojek says:

    Forgive my ignorance but still don't get it. If caloric deficit slows down metabolism so should fasting do that even more. When in caloric deficit body should burn all calories intake and if there's more energy needed, then glycogen should allow stored fat to become more accessible.
    If insulin stops body from getting fat surplus then 3000kcal daily should be less beneficial than 1500kcal. It is also impossible to provide the right amount of calories, there will always be deficit or surplus.
    If someone’s diet is OMAD 2500kcal in one fat-based meal would that still be beneficial?

  • DEBJIT DAS says:


  • Andrea Ingram says:

    Fasting benefits for spirit building body and soul. Alternate day fasting. Why Therapeutic Fasting Works Myths debunked with charts on video. A fast day is around 500 calories.

  • Edward Smith says:

    Fasting is like quitting smoking. You can't do it moderately. One cigarette will take you back to day one. Get past day three and the cravings negligible with both fasting and quitting smoking. Same thing with fasting. None of it is hard. You have to make your mind up to do it and not even think…..I can,t do it, I love food too much. Just do it!

  • JON Cunningham says:

    Fasting for Health, not for weight loss is where the focus should be.
    When we stop cramming things down our throats 6 times a day our system can rest, recuperate and rejuvenate. Whether it is water, urine, or juice fasting it is all good, & to eat less. Lots of liquid is needed for any cleansing fast to work well. I like using distilled water to fast to get all bad stuff out. All this food stuffing is making all of us very ill. The body needs a break now and then from the constant receiving of junk whether it is good or bad junk . This prevents the body from breaking down and we die of sicknesses. Its even in the Bible for healing. Fullness of bread was the main problem, not even what they ate. IMO

  • Lawrence Ross says:

    Dr Fung, if fasting causes a condition of autophagy, doesn’t it follow that your kidney function would show an elevated bun/creatatine/gfr? Thank you. Have been very successful in improving my insulin resistance by keto, fasting and cutting out ALL alcohol !

  • Mark Freeman says:

    The one thing that religions agree on is fasting!

  • Sifu Slim says:

    Great info. Cease the use incessant use of "right?"
    In Aloha,
    Sifu Slim
    Author of Sedentary Nation
    The other part that is lesser mentioned is that proper exercise does so many things to our emotions and physiology. Lowering stress and improving digestion and sleep are incredibly important in health.

    Part of good health is losing excess weight and toxicity–especially toxic and detrimental molecules stored in fat.

  • gtcstorm40 says:

    If we never ate junk food in the first place then fasting would not be necessary. The blue zones eat tons of carbs and they are mean and lean. This strategy is a band aid imo. It does "work" but I think there is a better way.

  • American Mythology says:

    I’ve been intermittent fasting and my parents are so worried! Lol

  • EX MIUWU103 says:

    Any questions, I got 2 seconds left.

  • i. zak says:

    I call him Doctor "right?"

  • Pablo Horteg says:

    This works. The 18:6 rule is the easiest way imo. Don't eat breakfast, eat lunch at 12pm and have dinner before 6pm. Eliminates unhealthy snacking and is easy to do (you are fasting as you sleep). You will lose weight (unless you absolutely gorge yourself with McDonalds during the feed window). Other advantages also — save time, save money, concentration boost, willpower boost.

  • JMichael Taylor says:

    Wow! I started doing alternate day fasting in 1999. Was just an idea I came up with. Made sense to me. I have a nice medical background, so, why not use it?! I was told it wouldn't work, it was too radical, my Veterans Administration doctors told me it was unnecessary, and loved ones thought I was a bit off. Well, it was working!
    Now, this doctor comes along 20 years later and verifies what I had previously done.
    This does work, folks. It requires discipline on your fasting days, but don't give up. It gets easier as you do it more often.
    Good luck, good health, and I hope you are successful!

  • Fred Cory says:

    If it wasn't for Gary Taubes, Dr. Fung would still be a conventional nephrologist merely managing the ravages of diabetes.

  • Library Files says:

    This is good if everything is working normal. However, I think that it’s more complex than this. I think their are many pathways to diabetes. My blood sugars go into the hundreds yet, when I exercise, my sugars drop into the 40s if I push hard enough. I produce insulin but why do I get hypoglycemic and my energy drop to the point where I become ataxic?

  • P MB says:

    "..just like the Lions, Tigers, and Bears… we are built that way" ; I enjoyed his discussion,… enlightening.

  • Mr man says:

    its fake,,,i fast for 1 year and i now weigh only 2.4 kg

  • ouivalerie says:

    The entire population was skinny back in 60s, 70s….all the years past…..skinnier as it went….there were occasional fat people that didn't get like 400 lbs, super fat was like 200 lbs…..something happened…probably cows milk and cheese and the hormones….it's irreversible…..we can find ways to tweak our selves….thyroid medicine used keep anyone skinny….when it was a good brand..I hear doesn't exist now……..Money got so hard to get with sharks taking all….people were like not motivated to move without knowing they were paid…..it's motivation too…..Motivation was so strong before we didn't think about eating between meals…..3 meals kept people skinny enough….it might be too much….but the livers and intestines of the population seem to me to have all the clog….from the junk for sale and junk in vitamins and medicines and fake things in pills and junk in pills.

  • Graham Itzstein says:

    Well, I've been needing something to get me motivated to lose weight, and this has done it for me. What an interesting guy, and what an informative video. I was a bit worried that, as an insulin dependent type 2 diabetic, that the fasting might make it harder to maintain a steady level of my BSL readings. I figure if i do regular monitoring to see what effect fasting is having on my BSL's, it shouldn't be a problem to adjust accordingly.
    Thank you Dr. Fung.

  • Mike Kelley says:

    Yeah, after four days of fasting I'd kill a few people and then I'd lose weight on the jail diet. So — good?

  • Scott Bryant says:

    Great video he so right I been use with my health and my clients.

  • Christopher Barclay says:

    I think we need to go "Cave" as in caveman. Caveman did not always eat on a regular basis. He walked a great deal and probably ate mostly meat. No wheat, no sugar, no rice, etc. They did not exist back then.

  • Stephen Berson says:

    After reading Jason Fung's description of how the body utilizes stored fat and sugar when fasting I was surprised to read further where he states fasting 'POSSIBLY" CAN REVERSE HIGH BLOOD SUGAR. I would think based on his statement the body definitely would lower the blood sugar when fasting but I guess he isnt confident or sure. That makes me skeptical of the benefit of fasting in addressing type two diabetes.

  • Xymo Nau says:

    People in concentration camps were on reduced calories and every one lost weight, so what this man is saying is nonsense.

  • Dez Nicole says:

    I cant seem to get past a 50 hours fast, mentally I feel drained, tired, lethargic.. But I am healthy, I dont have diabetes or any other kinds of health issues. How long does it take till the body starts burning the fat off the body and producing energy and focus??? How much water should I be drinking while fasting? Can I go one day dry (no water) next day some water?

  • Neal Catapano says:

    Here I am, August 2019, just started this week. Ridiculously overweight, blood pressure and diabetes problems. Will report back with how I do.

  • cbell3408 says:

    Excellent information 👍👍😊

  • Kathy Noggles says:

    How often do you recommend a person do a true fast and how many hours?

  • First Last says:

    ‘Breakfast is the most important meal of the day’

  • Prashanth K S says:

    You spoke so much about low calories diets that didn't work as it reduced metabolism.

    Then you started saying fasting works.
    Isn't fasting but extreme low calories diet? Are you stressing on the days that you eat to maintain metabolism?

    Then you show benefits of fasting but say is not complete fast and they still are eating 500 kcals. Is that not similar to low calorie diet?

    And then you say people fasted for 380 days? Is that starvation fast? Is that low calorie fast?

    What you are saying is so vague and confusing. I've read a lot about IF and Keto and even practiced it. But you seem to be saying the same thing and talking about it in two different voices and perspectives. Help me make sense of what you spoke here?

    My point is, you never clearly differentiated fasting vs low cal vs starving and why each works or doesn't work.

  • Nathan Taylor says:

    Doctors v Doctors. Weight specialist v weight specialist So much information; who do you believe ? Well Dr. Fung receiving a Nobel Prize Award just might be the one to listen to….My partner and I bought both books and been doing the intermittent fasting with a little excercise for about two months now and our physical and mental status are very healthy. Fat loss is around 13lbs and there is literally no mental swings anymore our mental health is very relaxed…my fat loss goal was 20lbs but I'm thinking going to 30lbs puting me at 175lbs at 5"9…another thing is the constant sluggish feeling is completely gone.

  • Justareader says:

    Prolonged fasting rocks!
    Furthermore, a whole food plant-based diet is the only thing EVER proven to reverse and cure cardiovascular disease PERIOD!

  • TheQueenLioness100 says:

    Can you drink kumbocha while fasting?

  • KHRN2014 says:

    I can listen to him talk all day. Yes, the content, but his voice and accent!

  • Deborah Barnes says:

    I like what he is saying but wish he would just get to the point. Repeating too much.

  • 57ashdot says:

    IF is a fantastic tool for anybody who is fitness minded. Short, controlled fasts that let you hit ketosis for ~6hrs a day.

  • David Westfall says:

    I've lost almost 50 lbs since February with intermittent fasting and light strength training 3x a week. I feel way better in general (including after I eat), I have more energy, and a better ability to concentrate. I highly recommend this guy's advice.

  • C Haz says:

    Well…… with a reduced metabolism you can't eat as much, but the candle is burning lower and your life should be longer due to that, as long as you don't let the weight go back up.

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