Intermittent Fasting, Muscle Loss & Growth Hormone

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Dr. Berg talks about intermittent fasting and muscle loss. It is a myth that you will lose muscle mass if you do intermittent fasting simply because intermittent fasting spikes growth hormone (GH) and GH protects your proteins. GH is called a protein sparer.

Dr. Eric Berg DC Bio:
Dr. Berg, 50 years of age is a chiropractor who specializes in weight loss through nutritional and natural methods. His private practice is located in Alexandria, Virginia. His clients include senior officials in the U.S. government and the Justice Department, ambassadors, medical doctors, high-level executives of prominent corporations, scientists, engineers, professors, and other clients from all walks of life. He is the author of The 7 Principles of Fat Burning, published by KB Publishing in January 2011. Dr. Berg trains chiropractors, physicians and allied healthcare practitioners in his methods, and to date he has trained over 2,500 healthcare professionals. He has been an active member of the Endocrinology Society, and has worked as a past part-time adjunct professor at Howard University.


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This video is not designed to and does not provide medical advice, professional diagnosis, opinion, treatment or services to you or to any other individual. Through my videos, blog posts, website information, I give suggestions for you and your doctor to research and provide general information for educational purposes only. The information provided in this video or site, or through linkages to other sites, is not a substitute for medical or professional care, and you should not use the information in place of a visit, call consultation or the advice of your physician or other healthcare provider. The Health & Wellness and Dr. Eric Berg, D.C. are not liable or responsible for any advice, course of treatment, diagnosis or any other information, services or product you obtain through this video or site.

  • so when i lost muscle on intermittent fasting,it was because of low level GH? a gland issue? i do have low LH and FSH which inturn gives me moderat to low testosterone production.

  • *Intermittent

  • i mainly do 16/8 fasting but just 2-3 days then refeed on healthy carbs. def slimed down. im still pumping the gym hard so very vascular but i did feel i was losing some muscle.. maybe i was just a bit flat. think i wil try a full week now 16/8

  • Not sure if you'll see this comment since this video is a little older now, but do you know if taking supplements will spike insulin the same way a meal would? I ask because its been shown that supplementing l-glutamine can drastically increase your growth hormone. So would it be okay to take this during the time you are fasting (without worrying about spiking insulin), especially if you are both fasting and lifting weights? Or should you leave the supplement for the feeding window?

  • Hey nice video,I have a question, I have hypothyroid, Can I do intermittent fasting?

  • Can you drink wheat grass shots during the fasting window and will it affect your fast?

  • I'm 34. When I was 18 I started doing body building. For over 10 years food has become my prison!
    Even in some years or months when I wouldn't train I still felt trapped by meals and protein. Not eating equalled being less in my mind. Intermittent Fasting changed everything.
    I am vegan now (which was another life changer and bubble burster), I still train, and I do Intermittent Fasting. Or as I call it- FREEDOM.

  • This is without a doubt the highest quality of info I've seen on YouTube. Very informative, no bullshit, concise and straight to the point. I've learned more from you than I have learned from all these other fitness YouTubers combined. Thank you!

  • I keep hearing 'grow hormone", but what hormone or set of hormones is that specifically?

  • Positive Thinking is Key.

  • maravillosa información.

  • My results:
    1) I went from 222.2lbs to 200lbs. I weighed in 15MAY2017 and again 01JUN2017.
    2) I no longer feel pain in my shoulder from arthritis. I've actually increased my range of motion.
    3) I went from doing 3 pull-ups one week to 12 a week later.
    4) My energy is incredible. I walk nearly 10 miles around Baltimore every other morning without breaking a sweat.

  • I love your videos. My only criticism is that you misspell intermittent.

  • I appreciate that he cites his information. I've had friends try to say that my source was bs research and I showed Dr. Berg to them and he shows where he's getting his info. Good stuff.

  • The hormone that counters the cortisol is the insulin which is the major anabolic hormone in the body and it is triggered by sugar and snacks that have carbohydrate, on the other hand, growth hormone is considered stress hormone which is released during hypoglycemia but the insulin is more anabolic than growth hormone. Sugar (carbohydrate) intake suppress cortisol. This is according to "lecture notes for USMLE by Kaplan" Thanks

  • Dr. Berg…I recently read that there are substances in apple skins and green tomatos that help you stop losing muscle mass as you age (if you also keep exercising as normal). Do you know if this is true?

  • This video has saved my sanity. Been doing Intermittent fasting for a month and this is the primary concern I had. Thank you.

  • Hi @dr. ,

    Is Soy chunks good on keto

  • You are great. Thanks a lot.

  • Dr. Berg, I appreciate all of your videos. I'd love to hear your analysis of longer water fasts, like 7, 14, 21 days. I've lost good weight on one meal a day combined with the foods you recommend, good sleep, strength training and Interval Training. But I may have reached a plateau. I'm thankful for losing 29 lbs since I started, but I need to lose another 25 pounds to reach my normal body weight. So I'm thinking of trying longer fasts to restart the weight loss.

  • can i still build muscle while doing intermittent fasting dr?

  • Intermittent fasting, does that mean I can't drink water too? And, is it possible to build stronger, leaner or larger muslces?

  • Nice video. Quick, easy and very informative. Well done.

  • Yet another fantastic video from Dr. Berg. He explains things so clearly and answers the exact question(s) we all have. Thanks so much for posting!!!

  • Dr. Berg, please turn the volume of your recordings up. they are so low , it is heard to hear even when i turn my volume to the highest level. Thanks.

  • dr berg… can intermittent fasting help increase height while you are in adolescence.

    Thank you
    waiting for your reply

  • How do you feel about supplementation w/L-Glutamine? Should I avoid the flavored and ingest the pill form?

  • Hey Doctor! I have been doing intermittent fasting for 3 weeks now and I am losing around 2 pounds a week. Can I opt for prolong fasting to accelerate by weight loss? What if I fast for 48 and I eat every alternate day – one meal?

  • if a i am a bodybuilder, how much of protein should i ea in the bulking phase and not leave ketosis?

  • Can i drink my fat loss drink made of cucumber, ginger, parsley and lemon juice drink every evening while water fasting? need answer fast

  • ah by interminating fasting you increase growth hormone in your body and reduce weight so can there may be a possibility that i amy increase my height as growth homone are needed for growth right.

  • So you arent losing muscle but you arent gaining muscle either?

  • love the video Dr berg "Simple and to the point"

  • or you fast, or know nothing.

  • Is it a bad idea to workout if you plan extended fasts (2 – 4 days or more) to burn more fat during the fast?

  • Damn good video

  • What does he mean with Hypoglycemia?

    If you are on a high carb diet Hypoglycemia fucks you up.

    If you are on a high fat diet Hypoglycemia is kind of normal, maybe with Hypoglycemia he means low insulin levels I don't know, or does it mean high ketone levels?

  • Eric, what are your thoughts on Dr. Agus? He is very against Intermittent Fasting… now I don't know what to believe.. -_-

  • that was my question & ive got the answer thanks doc

  • What about prolonged fasting? (Fasting for 2 – 3 days). Some people say that drains your glycogen in your liver and muscles and can have benefits for hormones and weight loss….. Dr Berg, what's your take on that? Can you Make a video on prolonged fasting to either green light it or debunk it??

  • You spelt "Intermittent" wrong on the board. Someone picked up an error on another video "Muscle" and here I am. I do IF and appreciate the information on all your video's. Your a genius and your changing lives!!

  • Your the best! You and Dr sebi are my doctors! 🙌💯 Keep up the good work! Thanks!