Intermittent Fasting for Weight Loss w/ Jason Fung, MD


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

➢New Video w/ Dr. Fung:

The Complete Guide to Fasting:

The Obesity Code:

➢Free Keto Primer eCourse

➢ New Webinar on Autophagy:

➢ MCT On the Go:

Other Books by Dr. Fung:

The Diabetes Code:

The Longevity Solution:

➢ Read the Interview Transcript:

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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.


  1. And it is better for you that you fast, if you only knew…… Qur'an 2 :184

    …. Showing you one more miracle… See the verse number…… And surah number combination…… Its 2.184 ::: first and the last number if you see it indicates 24 hours of day middle number middle number 18 indicates…. 18 hours intermittent Fasting video 2+4 indicates remaining eating window…. 2 indicates two meals a day. Its just my guess work…. I may be wrong…

  2. Dr. Fhung should open a fasting center for people to go and stay there for a week, 2 weeks, 3 weeks and having blood tests and all kinds of tests. I would be the first one to register.

  3. Well the fistula patients have been told to get 1.25 to 1.75 grams per kilo of body weight. I can't even grasp getting that much. But I have had this fistula for a year now, and it's not really slowing down.

  4. Personally I'm so excited about fasting's ability to get rid of loose skin because I have 120 pounds to lose and I was sooooooo worried about loose skin. I'm a week into ADF and eating fairly healthy/little on my feasting days and I'm down 4 pounds. I wonder if the weight loss would be faster on intermittent fasting? Hmm…

  5. He seems really smart, but I don't agree with his statement: "For whom has a calorie deficit ever worked". Well, for everybody. Everyone in calorie deficit loses weight. Problem is, most people can't keep it up for a long period and eventually revert back to old habits.

  6. I'm doing a 16/8 it's going alright. I feel better but after my birthday in three days I'm going to try a few days to fast to get rid of the extra fat I have,I'm 20 pounds over weight.wish me luck!


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