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Intermittent Fasting for Weight Loss w/ Jason Fung, MD



Dr. Jason Fung discusses how fasting changed your hormones, enhances fat loss and why it doesn’t lead to muscle loss.

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————————————–Key Takeaways———————————-

02:17 History of Fasting: Fasting has been done since the dawn of humanity. Religions prescribe periods of fasting. Ancient Greeks did it for mental clarity. In the last 50 years there has been a strong move against fasting.

03:06 Nothing Wrong with Fasting: Dr. Fung investigated fasting and found that fasting had a great many benefits. Periodic fasting allows your body to burn off fat. Dr. Fung uses it with all of his overweight patients. Blood sugar medications need to be monitored closely once implementing fasting, or blood sugar could go too low.05:25 Hypoglycemia: If you are taking blood sugar meds, you may become hypoglycemic.

09:42 Muscle Loss and Fasting: Starvation mode and muscle loss are two of the many myths. Hypoglycemia is not a big concern unless you are taking blood sugar meds. As you fast, you will consume glycogen.

16:53 Hormones of Fasting: Fasting increases growth hormone. It increases noradrenaline. These are counter regulatory hormones, which counter the effect of insulin. Insulin lowers blood glucose.

22:04 Three Day a Week Fast: Dr. Fung does 24 hour fasts.

26:32 Anti-Aging Benefits: Skin is protein, so skin may alter with intermittent fasting. During the process of fasting, you get rid of old cells as part of renovation.

28:44 Autophagy: mTOR is a major regulator of autophagy. Protein turns off autophagy. mTOR is a nutrient sensor, sensing protein.

33:37 Salt and Fasting: One reason why Dr. Fung’s patients use bone broth during a fast is for salt intake.

35:49 Kidney Function:

37:07 Hormone Impacts: The main hormone affected by fasting is insulin.

42:17 Cortisol and Fasting: Cortisol does rise with fasting. It is part of the counter regulatory hormones.

43:14 Noradrenaline & Fasting

48:09 Calories: Calories have nothing to do with weight loss. Fasting is about changing your hormones.

49:50 Nutrient Changes in the 1950s: There was little obesity. People ate cookies, white bread and ice cream. You ate within a 10 hour window.

54:51 Bullet Proof Coffee/Fat Fasting: Many of the benefits of fasting come from reducing insulin. Pure fat has almost no insulin effect.

56:26 Ketogenic Diet: Intermittent fasting and ketogenic diet are along the same spectrum, close cousins. The ultra-low carb ketogenic diet lowers insulin. Low carb diet delivers 71% of the insulin lowering of fasting.

01:00:39 Dr. Fung’s Morning Routine:

01:03:45 Dr. Fung’s Favorite Nutrient:

01:07:54 Dr. Fung’s Elevator Pitch: We need to teach people about the therapeutic value of fasting. It has the potential to change the entire health system of the world. Most of what we do is treat diabetes, high blood pressure and all of the downstream issues. All of this can be taken care of for free. We need to spread the knowledge of how to do it.

Kira
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29 Comments

  1. On day #2
    Ups and downs, but overall starting to feel better witch each hours that passers. For me the most difficult are the first 24h. Then I just kind of start getting used to it.

  2. 1:08 who wouldn't wanna do that? well all the big pharmaceutical that get their money from "treating" sick people… fasting is not business from them so they try to screw us all : ( GREAT interview, go Dr Jason!

  3. I look forward to the day that this is the first line of defense to diabetes, and obesity, and is taught in medical school. Don’t hold your breath, regardless of, “ Do no harm,” in the oath.

  4. I’ve been able to do keto and drop 40 lbs in 2 months. It’s been rough trying to lose 40 more. Longest I’ve water fasted is a little over 96 hrs. That shit sucked next goal is 7 days hopefully.

  5. I wonder if he has read any of Arnold Ehret’s work? Similar stuff but Ehret was a true genius. Being born in 1867 he was way ahead of his time.

  6. 9:00 WTF is he talking about the calories? Cutting calories to lose weight is a myth and it's not true? What? Of course it's true, how do you think you starve to death? You cut calories and your body has to burn fat to keep you alive so you lose weight cuz it's consuming the fat… and then eventually when you have no more fat left to burn it eats your internal organs and you die. Every person ever has confirmed that cutting calories will make you lose weight. What the hell is he saying? lol

  7. Dr Fung, during fasting, you mentioned increase in cortisol, in one of your videos. There is an ayurvedic herb- powder of the roots of ASHWAGANDHA (horse smell -translated literally). It is a well known herb to reduce cortisol by 30% or more. It is an ancient Indian remedy, and is recommended for all dieters, by Ayurveda doctors. This herb is generally recommended to those who need to increase their energy levels, and/or have trouble going to sleep at night.

    PLUS- drinking piping hot water in sips, in intervals of 30 min, would detoxify the body faster, and work as an appetite suppressant too.
    Dr. Deepak Chopra (MD Medicine, settled in San Diego) wrote some books- "Perfect Weight" and "Perfect Digestion", about 30 years ago.

    Fasting is the norm in India. It is done for religious purposes mostly. The dates on which fasting is recommended by Sanatana Dharma (the Eternal Religion) are calculated based on astronomy, when digestive power is weakened, thus advocating the benefits of fasting during these days. During fasting one actively participates in religious ceremonies- singing for Lord Krishna, lectures on Gita and Bhagwatam, association with other devotees. All these activities keep the person (on fast) busy and happy, in association with other devotees who also are fasting. Needless to say, congregational chanting, singing and lectures aimed at focusing on propitiating and serving Lord Krishna, ALSO helps in detoxification, repair, rest, weight management etc of the body of the devotee. BUT of course, since these fasts are usually only 24 hours long, cortisol is NOT a problem.

    Hare Krishna !!

  8. Hello, If I start doing IF 16/8 and maybe once a week 20/4 or for 48 hours and if I get back to normal eating (3-4 times per day) will I hit the jojo effect? Or it is just if I started I will have to it for ever? 🙂 thanks for answer

  9. This is the science of the future. Strangely, people are highly dismissive of fasting and or ketogenic diets, and many are still talking about the importance of restricting calories. The science has shown that calories aren't important for at least 20 years. It's the amount of carbohydrate that determines our insulin levels, not the amount of calories you eat. The key thing mentioned here is that reducing carbohydrate, from all sources, lowers insulin, which provides nearly the same benefits as fasting. The Human body simply does not appear to be designed to thrive on a carbohydrate diet. If Humans stopped 100% of carbohydrate intake, fasting would be totally unnecessary, due to the sharp reduction in insulin, and near total cessation of the needlessly complex bacterial fermentation occurring in the colon due to insoluble (indigestible) plant cellulose. In all fermentation there are waste products. Allergies, joint problems, eye problems, brain problems, and digestive issues stop when carbs are reduced to zero. This is likely due to the complete elimination of bacterial fermentation in the colon. Fasting stops the gut bacteria from fermenting food, but so too does stopping all carbohydrates. The Human digestive system is identical to a feline house cat, but our intestines are longer. Our digestive system is nothing like grass eating animals, it's not even remotely similar.

  10. Ask him about gallbladder disease…this doctor is acting like there are no risks with fasting…there are…and he's negligent in not mentioning them. He's making plenty of money on this whole "fasting" thing too…books, speaking engagements…wow…must be nice being a "celeb doctor" and getting away with murder!

  11. Awesome talk!! Been on IF for 3.5 years now (23 hrs three times a week and 15 hrs the other 4 days). About salt: you can put some salt into tiny empty capsules, which are available in many online stores and are super cheap, this way you don't have to taste nasty salted water nor feel salt depleted

  12. ive lost 100 pounds over about 2 years, i used a combination of things some subcontiously…. but the end result was 100 lbs thst has stayed of and 35/32/37 measurements…. but zero tone sadly… the thing i credit most was eating delux mixed nuts no peanuts, fruit, veggies, solid dairy (dont drink milk) i ate these all threw out the day sometimes in meal quantity sometimes just snacking when i had munchies. the weight literally melted off… when i platued a change in job and activity kick started it. i would est a nice dinner when it was cooked… a few times a week, other days a sandwhich or bowl of cereal or oatmeal. i curbed my sweet tooth making one of those items sweet or hard candy… the sweet tooth went away….

    i think my sucess was from providing my body a stable supply of protiens and other needed vits and minerals…. i was a one meal a day if lucky and then center store shopping… processed crap…. my body lived in starvation mode. as soon as my body trusted it the weight dropped…

    now family yell at me when i dont eat ir realize its been a good 24+ hes since i last ate and im finally hungry. i know when eat more often mj y energy level is there but im not very yungry most dsys… when i do fi allwsnt resl food i crave food for 3-5 days when i cant get enough meals…. id say i hit thst point about every 3 or 4 weeks….

    can you pleaee explain 1. what about the nuts snd fruit diets that may have been the contribution to my weight loss and if there was any possible risk i didnt see…. and 2. while i know my food choices currently havent been great, is the eating cycle im in harmful?

  13. I didn't saw the interview completely yet so I don't know if he explains it, but I'm wondering about children. I have 2 children, 7 and 2 years old. How their diet can be affected by these ideas and if not why? Thanks!

  14. Great Video clip! Sorry for chiming in, I would love your thoughts. Have you researched – Dinanlinson Amazing Look Approach (erm, check it on google should be there)? It is a good exclusive product for learning how to quickly lose weight minus the hard work. Ive heard some pretty good things about it and my buddy finally got cool success with it.

  15. I was into what this guy was saying riiiiight up until he said cutting calories doesn't help weight loss

  16. I used to be fat when i was a kid and when i turn 12 i just stop eating for days and just drink water.i lost all the weight . So i have been doing tht for year . People were tellinh me its bad ..wow good think i saw this I actually thought im doing harm to my body ..

  17. Question: in long term fast (20+ days), should vitamins be taken? Also in year long fast of 207kg man he was getting vitamins and 2 tablespoons of yeast to deliver amino acids that body cannot produce on it's own.

  18. Being vegan myself…and obsessed with fruit, especially bananas, does that mean I could have no bananas on a keto diet? LMAO. That'd be rough 🙁 (smoothie bowls/shakes especially are my fave)

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