Intermittent Fasting

How to Maximize Fat Burning

4.5 out of 5 stars5 stars75%4 stars12%3 stars6%2 stars2%1 star3%551 ratings97,251 views
How do you maximize fat burning? What should you eat – or not eat? Watch and find out.

This is the second part of our video series with Dr. Jason Fung – now free to watch for everyone. The first part is also freely available to anyone.

Sign up for a free membership trial in a minute and you can watch all seven parts instantly – as well as many other video courses, movies, interviews, presentations, Q&A with experts, etc.


Note that we now also have captioning of these course videos. Just press “CC” in the video controls.


What is Fasting? – Dr. Jason Fung4.4 out of 5 stars5 stars68%4 stars14%3 stars8%2 stars2%1 star6%932 ratings93205:21How to Maximize Fat Burning – Dr. Jason Fung4.5 out of 5 stars5 stars75%4 stars12%3 stars6%2 stars2%1 star3%551 ratings55103:52How to Fast – The Different Options – Dr. Jason Fung4.7 out of 5 stars5 stars83%4 stars9%3 stars3%2 stars1%1 star2%299 ratings29906:47

The 7 Benefits of Fasting – Dr. Jason Fung4.7 out of 5 stars5 stars86%4 stars6%3 stars2%2 stars2%1 star2%237 ratings23707:33The Top 5 Myths of Fasting – Dr. Jason Fung4.8 out of 5 stars5 stars86%4 stars7%3 stars2%2 stars1%1 star1%218 ratings21808:23Breakfast! Is It Really That Important? – Dr. Jason Fung4.7 out of 5 stars5 stars85%4 stars7%3 stars2%2 stars2%1 star1%205 ratings20507:08

The Most Common Questions – Dr. Jason Fung4.7 out of 5 stars5 stars82%4 stars10%3 stars3%2 stars2%1 star2%150 ratings15005:385 Tips to Make Fasting Easier – Dr. Jason Fung4.6 out of 5 stars5 stars80%4 stars9%3 stars6%2 stars3%1 star1%195 ratings19505:19How to Get Started with Fasting – Dr. Jason Fung4.5 out of 5 stars5 stars72%4 stars13%3 stars8%2 stars2%1 star2%190 ratings19002:30

The Power of a 7–Day Fast – Dr. Jason Fung4.6 out of 5 stars5 stars78%4 stars11%3 stars7%2 stars2%1 star1%184 ratings18403:34Who Is Dr. Jason Fung?4.6 out of 5 stars5 stars74%4 stars12%3 stars9%2 stars2%1 star0%139 ratings13901:56


Intermittent Fasting for Beginners

More with Dr. Fung

The Perfect Treatment for Weight Loss and Diabetes – Dr. Jason Fung4.7 out of 5 stars5 stars81%4 stars10%3 stars4%2 stars2%1 star2%195 ratings19545:20The 2 big lies of type 2 diabetes – Dr. Jason Fung4.8 out of 5 stars5 stars85%4 stars8%3 stars3%2 stars3%1 star0%130 ratings13042:54The Key to Obesity – Dr. Jason Fung4.7 out of 5 stars5 stars81%4 stars8%3 stars7%2 stars0%1 star2%155 ratings15544:22

Ask Dr. Jason Fung

Dr. Fung’s blog:

Low Carb Made Easy How to Lose Weight Low-Carb Recipes Low-Carb Success Stories


  1. MarciOnline
    Jimmy Moore's Dexa scan just happened this morning. To summarize, Jimmy suffered heart arrythmias, high blood sugar and now we learn he lost 10 pounds of fat - but also 10 pounds of muscle, mostly in his core/abs section. I want to look into fasting, but it seems like Dr. Fung's protocol has actually made Jimmy sicker - with high blood sugars & ironically making him fatter in the visceral area through muscle loss.

    What does Dr, Fung have to say about this? I'd be terrified to end up skinny-fat and actually end up increasing visceral fat in the abdomen with his system! I'm not against Dr. Fung, but Jimmy's results have really scared me now.

    Replies: #2, #3
  2. I think it's pretty clear that if you completely fast 28 out of 31 days in January like Jimmy, you'll absolutely lose a significant amount of muscle mass too, not just fat. That should be expected.

    However, 10 pounds of fat lost hardly equals "increasing abdominal fat", but should indicate the opposite.

    Finally, Jimmy has been struggling with extreme excess weight his entire adult life, no doubt due in large part to unfortunate genetics. Fortunately most of us – almost all of us – have a much easier time reaching normal weight.

  3. Apicius
    Marci, calm down. I can tell you that for me, the LCHF diet and fasting protocol has been a god send. I'm so happy I discovered this information. I have become so much healthier, and it also feels like I'm happier, more energetic and mentally more sharp. My friends and family are astonished at how I look. And I did it without the hundreds of hours of exercise (torture I used to put myself through) and I eat until satiety...the fasting hours fly by, and I don't even notice the meals I skip. I only eat breakfast and no lunch. Sometimes for dinner all I eat is a couple of pieces of cheese, or some olives, some tea and that's it. It's incredible how I'm not hungry anymore. I used to think of food all day...wanted to chew my arm off. Today, with LCHF and fasting...I'm a new healthy and in control being.
  4. Chad
    Are Dr. Fung's hypotheses (you don't lose muscle even with extended fasts) proven? I think not. Has Dr. Fung tested his patients that he places on extended fasts with Dexa to monitor their muscle and protein status? I think not.

    How can Diet Doctor promote a physician who is likely causing harm?

    Reply: #5
  5. Is losing a little bit of muscle while losing a lot of fat "causing harm"? Only if people end up underweight, and that is easy to avoid. Just stop fasting.

    I actually think Dr. Fung is sometimes simplifying a little too much in this area. It's clear you lose a little muscle mass during extended fasts, not zero.

  6. Chad
    Jimmy Moore lost 10# of muscle and 10# of fat. That is not "losing a little muscle and a lot of fat," in my opinion. Losing 10# of muscle is causing harm because statistically he will regain the lost weight in fat more than muscle causing his metabolic problems to be worsened.
    Reply: #7
  7. Chad,
    Jimmy Moore is not typical, nor is the fasting schedule he's on (it's very extreme), nor can statistics tell us what will happen in a specific and unique case.
  8. murray
    It seems he lost muscle mass in the abdomen because the muscles no longer had to support so much surplus abdominal weight, with the fat loss. That's hardly shocking. The more interesting question is whether he lost muscle mass in muscles that continued to work at the same level.

    I've not experienced any noticeable loss of muscle mass or loss of strength from fasts; however, my monthly fasts only go for 1-3 days and not 28 days like Jimmy.

  9. 1 comment removed
  10. Matt
    Lchf will lose you the same as hclf if there is a restriction in calories.
    Reply: #15
  11. Furbies
    Fung referred to Krista Varady's ADF study regarding no fat loss while fasting. Why? I don't know. Varady's study only does fasting every other day, and then usually while eating 500kcal on fasting days. That's drastically different than long term fasting that Jimmy did.

    1. Fung's article:

    2. Study referred:

  12. Eric
    Autophagy and removing senescent cells may improve health. Maybe fasting as in alternate day and ketogenic diets improve health in part through the removal of select tissue.


  13. Leah
    What's missing here is a video on BREAKING your fast! What foods, how long before normal eating again, etc. Looking it up on the internet, you get a mess of information. I can't have sugar, and most protocols call for fruit juice. That's impossible for me.

    I'm not talking about the intermittent fasting, I know you just continue to eat normally. I'm talking about a 7 or 10 day fast.

  14. Kenon white
    How many calories is considered breaking a fast
  15. Clive phillips
    Calorie counting is the worst possible way to try to lose weight! That's been known since Newburg &Johnson wanted to withdraw their theory paper in the 30s. Any weight(as opposed to fat) is quickly regained because calorie counting sends the body into survival mode. I've lost over three stone(42 lbs+) using lchf and I most likely eat a bucketful of calories each day! I've lost no muscle. I lose 2-3lbs per week which suits me fine. My insulin intake is down from 50 units twice daily to 6-8 units twice daily. My cholesterol is spot on! I eat heartlily whereas on stupid calorie counting the dieter is permanantly struggling. The reason governments don't tell the truth about the fallacy that is calorie counting is because there's a huge industry exploiting it. Wake up son.

Leave a Reply

Reply to comment #0 by

Older posts