Does Fasting Destroy Your Muscle? | Jason Fung

Does intermittent fasting destroy muscle? Many people worry about this, but what does the science say? Celebrities like Terry Crews use intermittent fasting to not only lose weight but also build muscle. Learn why fasting does not burn muscle. Check out my blog at / drjasonfung
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The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. www.amazon.com/dp/1771641258?...
The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. www.amazon.com/dp/B0795BLS8D?...
The Cancer Code - Scientific exploration of how cancer develops - www.amazon.com/dp/0062894005?...
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KZbin Medical Lectures (for specialist physicians):
1. The Roots of the Obesity Epidemic - • The Obesity Epidemic, ...
2. Therapeutic Fasting - The Two Compartment Problem: • Fasting and Weight Los... ​​
3. Does Calorie Counting work? • Why Calorie Counting r... ​​
4. Two Big Lies of Type 2 Diabetes - • Two Big Lies about Typ...
5. Reversing Type 2 Diabetes Naturally - • How to Reverse Type 2 ...
6. Insulin Toxicity - • Insulin Toxicity (How ... ​​
7. Saturated Fat - Friend or Foe? • Is Saturated Fat Bad? ...
8. Diet and Disease - • Diet and Disease (The ...
9. Dangers of Fructose - • Fructose and Fasting (...
10. Insulin Resistance - • Reversing Insulin Resi...
11. Role of Hormones in Weight Loss - • Hormones in Weight Los...
12. The Obesity Code Lecture 1 - • The Obesity Code Lectu...
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Timestamps
0:00 Does Fasting Destroy Muscle?
0:52 How muscle grows
2:31 Fasting does not burn muscle
4:07 Counter Regulatory Hormones
5:14 Side effect of Growth Hormone
5:54 Fasting increases Growth Hormone
#jasonfung #drjasonfung #fasting #fastingbenefits #weightlosstips #intermittentfasting #drfung #fung #calories #weightlosstips #caloriesincaloriesout #weightloss #nutrition #diet #health #weightlosssolution

[@drjasonfung]

Learn more about Fasting - Solving the Two-Compartment Problem - kzbin.info/www/bejne/e4XOqI1_npiFbdk

[@theuzers]

LOL hey jason I have the same inspire fitness equipment great machine durring times like this

[@LegendStudioGames]

Can you please do a video on high protein diets? I'm considering eating 150+ grams of protein on my 16/8 IF days in order to curb hunger and not binge and regain fat from my 72hr fasts. But I've heard protein creates an insulin response, is that something I should be worried about?

[@Teslawaverunner]

Could you possibly do an analysis on the Phoenix Protocol ( August Dunning ) specifically Chapter 3 on water fasting. According to this book an extended water fast beyond a couple of days will result in heart muscle loss ! This sounds counter intuitive , how would we have survived in Hunter gatherer days if by drinking water while on a hunt ( and therefore not eating food ) the heart was destroyed. The medical information in Chapter 3 looks like it is well referenced to medical reports so not easily dismissed. Would appreciate an MD analysis thx

[@Chris-vt6nl]

Hello Jason fung your videos are life saving!! I have a personal question to ask you may I know how old are you? I know you have a son but don't know your age. If you are 40 or above I'll be very surprised

[@michealknight2739]

How are u going to train in a fasted state u will burn out

[@amberdawn1244]

I've been fasting since I was 19 & read the book, Fasting The Ultimate Diet, by Allan Cott. Now I'm 60 & people say I look 40! Amen

[@victorguani8799]

Im doing omad can I ask which fasting you are doing

[@amberdawn1244]

@@victorguani8799 I also do OMAD now. Plus, I try to get in a 3 day fast every month or 2 for anti-aging & to regenerate the immune system (according to research done by Dr. Valter Longo). In the past I did more long fasts, like up to a week, but I'm happy with OMAD & a 3 day fast when I feel like it

[@victorguani8799]

@@amberdawn1244 thanks

[@carina9629]

@@amberdawn1244 You do OMAD too? What time do you eat your meal?

[@amberdawn1244]

@@carina9629 Lately I've been eating my daily feast at 2am. I'm a night person... I'm "not normal" if you talk to my family lol

[@TheElvandal]

I’ve been fasting since the last time I ate.

[@ChrisNajdek]

I started fasting just under a year ago. I primarily do ADF and go 36 hours before I eat for roughly 6-12 hours. I was 307 lbs when I started fasting and walking and I’m now between 195-205 depending on the day. I’ve started adding kettlebell workouts 3-4 days a week and I’ve seen a huge increase in my lean mass. Dr. Fung is the main reason I started fasting. Thank you.

[@jennh1020]

On your up day do you just eat until satisfied? Do you track calories? I'm having issues trying to figure out how much to eat on up day

[@doracarry-on5453]

Way to go 💪👏👏👏👏👏

[@ChrisNajdek]

@@doracarry-on5453 thank you!

[@ofconsciousness]

Thank you for sharing!

[@ofconsciousness]

And congratulations!!

[@thomaswilbornjr3128]

I lost 70lbs doing exactly what you are saying. Once I added resistance training while fasting I put on lean muscle and it completely changed my physique. One of the best decisions I've ever made!

[@AzaleaBee]

This is about where I am now. Weight from 239 to 170 through fasting and LCHF with minimal processed foods. Although I am still overweight, I'm concerned about losing too much without having built up muscle. And also, losing so much that I one day become underweight. So, I've started with light weights at home. Any advice?

[@ivoivic2448]

and then you woke up.

[@101elelky]

@@ivoivic2448insecure incel who’s miserable with his personal life spotted

[@ivoivic2448]

@@101elelkyhaving a hard time shitting out that sticky brick? I believe in you, just more minutes. nice projection though.

[@101elelky]

@@ivoivic2448 only a miserable person would come here to say something like your first comment… suffer by yourself man. Everyone else here is making changes for the better…

[@jennyg5426]

We need a Jason Fung in every doctor’s office in America.

[@reachyouteachyou4649]

Nk money in cures

[@skysky323]

Dayum! That one-armed chin up casual flex by Dr Fung at 0:26. Dr Fung is flexing not only his intellectual strength but his physical strength as well! Respect!

[@elcidgaming]

He is quite jacked

[@XAUCADTrader]

Being jacked does bring credibility in the fitness and nurtrition space, especially among the bodybuilding bro community where I'm seeing a lot of attacks. Might as well, being jacked is a social asset and is pretty easy to manage (its just the consistency that's hard.) He has the equipment, that's the hardest part.

[@halftruths603]

Where was the one arm chin up? He used both arms to pull up his body.

[@zulkefleeabdullah6068]

@@halftruths603 oh ok.. i watched it again..and yeaa.. nice trick..haha

[@taxidermycoach5847]

@@zulkefleeabdullah6068 It is the in-between progression of going from a two handed pull-up, to a one handed. It is much harder than a two handed pull-up, very impressive.

[@DrTariqRamadan]

With Intermittent fasting and low carb high protein and average fat, more veg moderate nuts and fruits, eating more whole real food, avoiding junk and with Cardio and resistance training I lost 7 kg in one month and the best shape ..... I'm now in the best shape of my life, I'm 33 Yr and I've studied pharmacy and public health... Dr Fung is the most revolutionary man in the field of health and nutrition... The amount of nutrition knowledge I learnt in last one month is far better then my 10 yrs professional education

[@ivoivic2448]

to lose that much in a short period is unhealthy. fake doctors on the internet man...

[@nyreekrikorian]

I didn't think it was possible for me to love Dr. Fung more, but here I am! Wow!!

[@hermanirascible3310]

Your book did not shy away from scientific reasoning and was yet very easy to follow!

[@zenane2012]

Greetings and gratitude from Ethiopia. Thank you Dr. Jason Fung

[@Magicstar-nw6xw]

You deserve an award. You're an amazing doctor. 🙂

[@smitadoule5932]

Thank you Dr Fung.. Love all your videos, they are all very informative.. Thank you for all your efforts, stay blessed always.. God bless.

[@JivanCamoirano]

Very true! I did intermittent fasting everyday for the last 3 years and I gain lots of muscles and lost fat and at 44 years I m in the best shape of my life thanks to training fasted , thank you for your information really appreciate

[@antonyoneil294]

What time did you train?

[@JivanCamoirano]

@@antonyoneil294 I train early morning around 5:30, 6

[@JivanCamoirano]

@Robin Sailo I personally training fasted I couldn't even think to eat before working out

[@JivanCamoirano]

@Robin Sailo Not in my case, I guess I m use to it and the body is forced to use your own fat as energy this it sounds very good to me.

[@juanpablosanchezaveleyra6454]

This did not work for me. I got very limited muscle grow even when being a newbie. I started adding a little bit of sugars or carbs before workout and I grew in one month all I did not grow in 6 previous months. I think it has something to do with cortisol levels or something.

[@cjcj6945]

Thank you for such a great discussion on this subject Dr.Fung!👍

[@emochinchilla]

Great info. Thank you for taking the time!

[@JesusHerrera-vx2pn]

Finally. The real explanation to the whole thing. You are the best Dr. Fung

[@GerryStilton]

What great information! Thank you Dr. Fung for sharing the vid!

[@gardnzr]

Thanks for posting this. It's important to note that Terry Crews has said he does 16:8 and works out in the morning. He then continues fasting after his workout until 2pm. This means that his body is still pumping out HGH while his muscles are recovering. I'd be interested in hearing more about the studies behind this.

[@JGComments]

You might be interested in LeanGains by Martin Berkhan. Big fan of IF and quotes a lot of relevant studies on fasted training and different fasting + exercise protocols.

[@FalaqX]

If you think that TC is natural then i got a great investment opportunity for you....

[@jahdjajbdj731]

@@FalaqX hahaha

[@GoneCarnivore]

Ocean Front Property in Arizona

[@mannyblackstar]

You forgot he also Tren hard.

[@lindagadsden3815]

Thank you dr Fung, great content. I really look forward to watching your videos each week. Take care of you, too. LG

[@caiopenhalver4900]

Always bringing up great stuff! Tks a lot

[@GerryStilton]

Thank you Dr. Fung for sharing the information!

[@ildiphoenix]

Thank you Dr Fung this videos are so precious,I am 73 and doing every day 14 -17 hours fasting since last august and lost 12 kg also stop eating bread and doing weight training,use to be a binge eater 😊❤

[@williamfurtado2244]

Dr. Fung you truly are a wealth of knowledge! I’m so thankful for the internet allowing us all to connect and learn from someone like yourself! Thanks for your hard work!

[@ScottWorthington]

Thanks Dr. F. I appreciate your frequent insights.

[@winbalingit8502]

This was awesome!!!😁👍🏽👍🏽Thank you Dr. Fung!!!😁✌🏽

[@nomad-thisisgodsworld1757]

Dr Fung, you are the complete package. Handsome , kind, and Intelligent!😉😉😉😉😉

[@danielescamillajr3598]

Damn bro, you trying to f.......?? Lol

[@michaellongstreath2405]

Always enjoy the good information, thanks Jason

[@americo8568]

Great thanks Dr Fung, I’ve been wondering about this and once again you provided evidence. You are the MAN!

[@jobsready]

I only listen to Dr. Jason Fung for my weight lost and my wife T2D solutions. Thank you so much

[@Boxxxxxxxxx]

He clarified in one video what dozens of fitness gurus have danced around conflicting “conclusions” about. 25 and have been intermittent fasting since I was 18/19. Perfect example of the difference between expertise and education.

[@JohnKowalskyDrive]

Yeah I can't wait for all the debunking videos by people who never tried fasting.

[@fattohealthy1098]

Can you drop a link please

[@cidorinhaamaral5751]

Thank you Dr. Jason Fung, for all your great information. Gratitude. 🙏🇧🇷

[@rochellet7303]

Thank you SO MUCH for this answer and for clarifying this WITH research and an easy to understand explanation.

[@austingeog]

Hi Dr. Fung! So proud to be a small part of all the healing and good you bring to the world. Our bodies are wise! They aren’t going to loose muscle in long fasts or our ancestors would not have been successful hunters and we wouldn’t be here.

[@lennygarrison6836]

@bnza10 you bring a lot to the table. You should comment more often.

[@lennygarrison6836]

@bnza10 oh no, definitely not!! You’re wit, intelligence, and intellect, are all so refreshing!! Also, please be sure to procreate! Amongst a super, duper, crazy world, we need more people like you!! 😉

[@JohnKowalskyDrive]

Like an old married couple :D

[@Dundatta258]

I feel excellent when I fast and see great weight loss results. Thankyou Doctor for breaking this down for everyone. Great information

[@evelynmelian-glick436]

I LOVE your videos! You explain things so well! So happy to have found you 🙏🏻

[@ginah1956]

God bless you, Dr Fung🙏🌹❤️

[@marylougregorio5790]

It’s fun to watch him now, he’s loosening up and more relax!

[@0anant0]

I was gonna say the same thing! Yay!

[@joeblues2000]

Keep preaching!!! My life is completely different because of fasting!

[@davothegreat9990]

So what?....

[@ivoivic2448]

@@davothegreat9990sssssshhh, it's the new fad, let the kids play.

[@autogeek23]

​@@ivoivic2448fasting has been around for centuries

[@soldierofyah7254]

how much do you fast ?

[@elizabethkoenig5185]

@@ivoivic2448 Your idea that fasting is either new or a fad is mistaken.

[@fueledbyplantzz]

This is the best explanation of fasting and building muscle I’ve ever heard

[@ellaenchantedgoddess268]

Dr Fung. You re gold. I'm so grateful i found u. It's the knowledge well. ❤

[@jamtmann]

Awesome….I have been a professor teaching exercise physiology for over 30 years, and you have really opened my eyes. Thank you !!

[@ivoivic2448]

you're a pretty shitty professor if you just now learned something new.

[@simplyhuman6682]

another fantastic ,very genuine, interesting and most of all TRUE informative video, thankyou dr JASON. again KEEP IT UP 👍

[@BizRasam]

Dr. Jason Fung, thank you so much super helpful stuff!

[@Bvsterrrrrrrrr]

U and ur channel deserve millions Doc.

[@annpringle8219]

I think you for educating the people. We have learned do much from you!

[@W-HealthPianoExercises]

Thank you, Dr. Fung. You are so helpful to many people! Keep up the great work!

[@eetadakimasu]

Thanks for the great videos, they're helping me on my fasting journey!

[@carlosdsandre]

I loved the easy-to-understand explanation!!! Keep up the great work!

[@misottovoce]

I have three of your books (I have no diabetes but was interested in reading your book on that before I gifted it to a diabetic friend). Over the past 3 years and mostly due to YOUR very clear but detailed information, I have lost the 17 kilos I had too much of and was insulin resistant. I am definitely keto and fast daily, either 16/8, 22 or 24 hours and feel so much healthier and better for it. Thank you for your work and glad to see you more on KZbin!

[@LTPottenger]

This message is so important. The first fasting I did was over 30 years ago but I stopped doing it because I was so afraid I would lose muscle! How I wish that I had know then what I do now, I would have been ripped that whole time.

[@tylerandleahcanadian3888]

I think most guys with abs starve themselves like this just dont admit it .

[@slicktmi]

Can you please elaborate your knowledge

[@KingKikikoi]

I think it’s down to individual. Because I lost fair amount of muscle when fasting

[@LTPottenger]

You won't lose any unless you do very long fasts. @@KingKikikoi

[@-mugen-]

@@KingKikikoiBut did you actually continue to incorporate working out heavy etc while fasting?

[@lakshmisubramanian6]

Dr. Fung you are a rockstar .....Thank you for what you do!

[@spyro7249]

Good video Jason thank you!

[@cptpapa]

Wish I could hit that like button more times just for the ending!

[@ritchiehornak3917]

I’m looking forward to another book. Maybe another “code” based book, like “The Fitness Code”. Keep up the good work and thank you for expanding my understanding.

[@GK-zr9cq]

The Vaccine Code

[@rakeshmohan6278]

@@GK-zr9cq ooooooooh yeah! You are on to something.

[@omersadiq9171]

Dr Jason is really great...Many thanks for sharing precious information

[@KuumbaOnline]

One of the best videos so far!!! Thanks dr fung

[@zhanna5827]

Love the intro! 😁💪And everything you stand for 💯

[@hazelgabriel5739]

thank you so much Doc Jason Fung you save my life God bless

[@fs8541]

Light informative videos. Your a miracle 💚

[@goglolee]

Love your videos, your insights, and your sense of humor. You’re easy on the eyes as well!! ❤

[@hackptui]

I proved this is true for myself. I did my first 7-day water fast recently, at a point where my lifts were at their peak (bench, military press, lat pulls, etc). I lost 12 pounds during the fast. The first few days after the fast, I felt weak, of course, but within a week, I was right back at the same weights I was lifting and still about 7 pounds less bodyweight.

[@davidshillito]

Hi. You wrote ~ "The first few days after the fast, I felt weak, of course" ~ why 'of course'? Can you explain why this was expected? Thanks

[@hackptui]

@@davidshillito I didn't eat anything for 7 days. It's pretty stressful on a body. At least that's my experience. If you don't feel any different after a 7-day fast, I envy you.

[@Ldenlord]

@@davidshillito cuz usually the first few days your body still expects food sources ... but after that period of time , it will be dependent on your body fat 100%

[@smont4335]

@@Ldenlord it goes for muscle first, bodyfat will always go last because it's more of a necessity to live. Studies are great, but most of the time they don't play out in real life. And fasting is the fastest way to loose muscle. Point blank period. It's got a ton of health benifits, but it's the absolute worst thing you can do if you want to build or maintain muscle mass. Intermittent fasting is much more doable, but still not ideal if building or maintaining muscle is a goal

[@Ldenlord]

@@smont4335 if that’s really how the body works we’d extinct the long ago ... imagine we wouldn’t be able to hunt for food for long period of time , and losing all that muscle how tf do we have to strength to hunt for more food when animals are finally available ???? Our body store fat for this SOLE reason , to use it for fuel when we can’t eat ... imagine you save up all those woods but then chop down and burn your house just for fire in the winters , that’s how stupid your argument sounds

[@alainmancilla8181]

Always rewatching this video to keep me motivated before I start my 40 hour fast 😂 almost 5 years fasting now 🙏🏽

[@sheevamatimbas4300]

My praise for Dr. Fung is basically limitless.

[@CarCrashToday]

Very enlightening video. Thank you!

[@georgerivera3148]

Dr Fung has those guns who would have known 👀

[@elizabethkoenig5185]

I was impressed!

[@missnurseeri]

I am majorly impressed. 💪🏾

[@hannesaasamets9210]

Good video, most helpful, great insights, well referenced. Thank you!

[@revatiparmar6289]

You ate saving many lifes God bless you and your family. You are great 🙏🏻🙏🏻🙏🏻

[@soumyashiv_diggikar]

Thank you Jason . Considering so many fasting videos off late , the reason I love your videos is hard core scientific evidence and it’s critical appraisal . Being a doctor myself into academics I always wonder only few people get the hard facts from a published paper . You make it easy for general audience too … that’s your one of X factor as well . Tremendous job and contribution to the society !! Keep going with all love and support …

[@AnovaLisaDragonfly]

How perfect! I’m starting ADF with weight training. A beautiful friend who’s been weight lifting for years says that fasting and lifting don’t really go together, that lifting requires eating throughout every day to stay fueled and feed muscle growth. But I knew I could make it work, get all the benefits of fasting AND lose weight and build muscle. As long as I keep my feeding days high-protein and nutritionally dense. Appreciating this video and the comments.

[@SuperMrAndersen]

This doctor I think was talking about NOT loosing muscle, not about gaining muscle. We have fuel in our body for about 1 day as glycogen. But when fasting where we get protein which we need all the time for blood for example?! I think we need to eat protein every day for just not to lose muscle.

[@elizabethkoenig5185]

@@SuperMrAndersen Dr. Fung noted that patients *gained* muscle while fasting. I know that I have. I've been doing mostly alternate day fasting for the past 7 montns, and am doing more exercises, more reps, and using heavier weights.

[@faaututavale5287]

Thank you ❤️ Dr Jason Fung, learning lectures.we love you 🌹💮🏵️🌸🌺🌹💖

[@adamw2030]

Great video thank you!

[@lhossworld]

Thank you so much Doctor. Oh how I wish more were like you. You are an absolute gift.

[@gbfbouncer]

Great video! Train harder recover faster, what more can you ask for

[@polpepper403]

Great info. Cheers :)

[@jayarelle2666]

Great information, Dr. Thank you

[@TheTattooedRonin]

Hey had no idea you had a channel! I found your video from one of your talks on fasting I saw randomly online the other day. It was so good and informative I saved it to listen during car rides. This video was great as well. I just started fasting few weeks ago so far the results seem to be well and I am not that hungry as I thought I would be. I am honestly use to it. I fast my first 8 hours after waking up and only eat within the 8 hours. I only do it 4 days out of the week though. On days I work. But on my off days I am still eating clean nothing too crazy. Already notice my abs showing up more now so lets see how it looks in few weeks. No signs of muscle loss yet so thats good. I will do an update video in the future on my channel. Love your videos so far Doctor thanks for them.

[@sallydr7247]

Thank you 🙏

[@wahrheit2186]

Very good Information! Thank You 👍🏼

[@jlavelleis53]

Great information. Love his presentation style.

[@ifh4030]

0:25 Love the inspiration of the one handed pull-up.

[@foodhead25lovefood99]

I Thank you man, you are funny too. I was able my lower my blood sugars from 16 to 5 in one week. that was in January 2021.will keep at it and keep everyone posted too.

[@namrata29t]

Thanks for clearing my doubt

[@antoniorea801]

Thanks for you lesson, it's very simple and very clean...

[@asierarrizabalaga436]

I gained 8 kg of muscle mass working out (weight lifting) fasted and eating twice a day. I eat no carbs only those coming from veggies.

[@jay6817]

I'm here not to get advice really, just to watch the first opening sequence and get a giggle. That was brilliant thanks. 😊

[@lisamoore9238]

Love love love your videos and I am learning so much!! Thank you 🙏

[@louisegraham3204]

Many thanks Dr Fung!

[@TheRealCoyote]

Very, very interesting! And sad...because many of us have been given wrong information all our lives.

[@elizabethkoenig5185]

I just wish I'd known this years ago!

[@texasbelliott]

Love how this video started with a Dr. Fung gun show!

[@gyanibastola6729]

Very useful information. Thanks for sharing your thoughts

[@phsal5182]

I’ve learned new and useful info watching this. Many thanks!

[@misiekkkPL]

You're a funny guy, Doc, thank you for your work, i regret that i didn't knew about your work before my grandma suffered and eventually did from diabetes

[@khalidalmansoori6033]

i do fasting alot and i feel really better than before

[@Liza-ks9gx]

Very informative! Great education!

[@bretyoung1869]

Good job Doc !!

[@jflcreate]

I knew the analogy of "storing fire wood for winter and then instead chopping-up sofa" was going to come up...LOL. Great job Dr. Fung. Thank you!

[@NawazKhan-bf6en]

Lol 😂😂

[@flydesit545]

Jason i now want a 10 min workout video from you after seeing that legendary pull up 😆

[@merdiste]

WRONG [00:26] ··· CHINUP ::: one word ::: upgrip [supinate grip] ··· PULLUP ::: one word ::: downgrip [pronate grip] ··· sundry singles ::: situp, pushup, deadlift, etcetera BUDAPEST 2021 FEBRUARY 16 8.3 AM

[@litt_000]

@@merdiste vai se fuder

[@juanitadoolin7611]

@@litt_000 🤣🤣

[@Black-Panther94]

Thanks man. This video was very educational and inspired me to incorporate fasting to my body fat reduction routing.