What is the Best Fast Length? (Fasting Basics 3) | Jason Fung
Dr Jason Fung discusses the best fast lengths for you, including 16;8, Time Restricted Eating, 24 hour fasts, One Meal a Day (OMAD), 5:2 diet, extended fasting and more. Shorter fasts are best done more often, but longer fasts (extended fasting) are more powerful. The best fast is the one that fits into your lifestyle. Fit your fasting into your lifestyle, don't fit your lifestyle into fasting. Check out my blog at
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BOOKS:
The Obesity Code – Reviewing underlying physiology of weight loss and how low carb diets and fasting can help.
The Diabetes Code – Reviewing how type 2 diabetes is a reversible disease and dietary strategies.
The Cancer Code – Scientific exploration of how cancer develops –
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**Fasting Aids**
Pique Fasting Tea (recommended)
Fasting Community and Coaching:
YouTube Medical Lectures (for specialist physicians):
1. The Roots of the Obesity Epidemic –
2. Therapeutic Fasting – The Two Compartment Problem:
3. Does Calorie Counting work?
4. Two Big Lies of Type 2 Diabetes –
5. Reversing Type 2 Diabetes Naturally –
6. Insulin Toxicity –
7. Saturated Fat – Friend or Foe?
8. Diet and Disease –
9. Dangers of Fructose –
10. Insulin Resistance –
11. Role of Hormones in Weight Loss –
12. The Obesity Code Lecture 1 –
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Time Stamps:
0:00 Intro
0:35 How Fasts differ
1:28 Fasting – 3 meals a day
3:16 Intermittent Fasting – Time Restricted Eating
4:04 Intermittent Fasting – One Meal a Day – OMAD
4:50 5:2 Diet
5:41 Extended Fasting
I used to weigh 296 lbs …. today I weigh 174 Lbs … where were you 25 years ago … God Bless you for what you do … You are changing lives … With your help I helped my daughter loose 90 Lbs in 5 months …. People this is REAL !!!
What method did she use? 16/8 or longer fasts?
Thank you for sharing
I really needed to know if this truly works bc I’m at my wits end tyvm👍😉
that is amazing bro
@@sssimon954 she is trying different ones but she does one 48 or 2 48 per week … she has 2 young children … but she is changing it up …. she uses green olives to get to the ends … they are fat … green olives … pecans … and macadamia nuts are the key to getting 6 more hours in a fast because they are mostly fats …. I eat 1x per day … I do not like the long fast. I use a 2 hour window … or just one meal a day….. I eat mostly low carb all the time … her as well … hope this helps you .. good luck
@@BrianJohnson-cj8xf thx. So fat does not trigger Insulin?
What I’m learning is that if I want my body to run the most efficiently, I must treat my body as a business. If I run my business with 3 shifts then I’ll have to pay for overtime and double time, increased workers comp claims, sick days, more electricity and gas to keep the building running, etc. All costs increase. However if I can get workers to work a 6 hour day, then they’ll have increased energy while I have decreased costs and overhead. Same with eating. The body will run more efficiently if it doesnt have to spend all it’s time digesting food. Itll be more happy and productive to do other things like repair cells and burn fat.
It’s rather unfortunate that you view your body as a “business,” because that is *precisely* what’s been made of it by the “food” manufacturers, which has gotten us where we are today. The model I prefer is to eat closer to the way our ancestors did, whole and unprocessed, instead of stuffing ourselves with packaged, preserved, and adulterated substances that have been rendered devoid of nutrients and *real* food value. It helps me to visualize my viscera and *consciously* ask them what they need and want. Carbohydrates full of antinutrients are never what I “hear” back from them! Of course, your business analogy is probably more suited to the rapacious capitalism we live under in Western civilization. Whatever floats your boat! Just offering an alternative to that.
@Much Dutch!! A very good analogy to understand the basic concept of body functions. 👏👍
Great analogy!!
Excellent analogy!
@@ady6837 Thanks!
That’s probably the best tip I’ve heard in a long time- “Fit the fasting into your lifestyle, don’t fit the lifestyle into your fasting.”
When somebody is great at helping people, he is great in any advice.
Agree
I agree, but if we are serious about our health, we need to sometimes adjust our lifestyle. I didn’t say completely alter it, but some or even many adjustments may be necessary (fasting, eating habits, exercising regularly for other health reasons, going out to eat less, etc.)
Absolutely
Same here, but when fitting into my lifestyle, I may have lunch with the ladies one day or dinner with friends another. Is changing the time of eating in a day in the 24hour fast effective?
Check out my video on why fasting works so well – https://youtu.be/ETkwZIi3R7w
I did a 93 hour fast because omad stopped working for me. Because I have low thyroid and very slow metabolism. I was getting so hungry and bad cravings because my body couldn’t access the nutrients it needed. My body felt so heavy and movement was becoming very difficult. I had enough and went straight into it.
On the second day i felt so much better and i was almost scared of re-feeding at the end. I felt the omad working the next day.
Could you please give more information on re-feeding after a long fast?
Dr Fung, is there any concerns about safety when doing a long fast such as 7 days+? Do I need to monitor any blood work?
Hi Dr Jason I got no time to make bone broth soup but my mum do make healthy soup almost everyday can I drink the soup to replace the bone broth. Or like miso soup kind. Hope you can give me a reply. I am not obesity but I want to fast as previously I have binge eating disorder due to some stress. So I hope to fast to clear out whatevrr junk food snacks store in my body.
Dr jason fung sir, I am 39 years old and I have recently diagnosed with diabetes type 2 just 21 days ago and I am very worried about my health, my Hba1c is 7.0, plz help me in choosing the right diet for diabetes type 2 reversal, plz reply
Is there any danger that fasting will bring on mania for a person with Bipolar disorder? Should ppl w bipolar stick w Omad or 2mad and avoid longer fasts?
I fast 18 to 20 hours having 1 meal a day. 80 yrs old and feeling good. Keto life style 20 carbs a day.
Amazing👏🏻👏🏻
Awesome!
Wow. What does your typical meal look like?
Richard….what does your daily meals look like
If you’re only eating 1 meal a day then you are fasting 23 hours a day, unless it takes you more than an hour to eat your meal.
Longer fasts suit me better because once I start eating it is hard to stop.
That’s the same with me, I want to use this time while I am fasting to reshape the way I think about food after I stop my fast in 6 days
Can either of you give me some tips to get started or to get through day 1. I’m in a bad frame of mind and I always make an excuse come 4/5pm of day 1. It’s quite frustrating!
Are you eating a lot of carbs?
@@codyg3305 yes, nothing processed but I eat rice and potatoes and acorn squash. Other than that its mostly protein and fat and other veggies.
@@trueblue1359 even though your carbs are “clean” carbs, your body very much so reacts to the sugars in them the same way. Especially potatoes and rice which are prone to creating an insulin spike. Insulin spikes make you want more carbs when you come crashing down. This why a clean keto (look up mediterranean keto) is probably the best diet to combine with fasting. Eat clean fats, keep your carbs really low, and you’ll notice it is much easier to fast.
You changed my life, Dr. Fung. Seriously. I’m 63 and was morbidly obese for 40 years. I “happened across” your videos over 2 1/2 years ago when my daughter in law scared me to death saying they were fasting as a part of becoming more healthy. I really connected with your message and saw where I was headed. No doubt I would be type 2 diabetic before long. That scared me me further and I jumped aboard and unlike the decades of yo yo dieting I had experienced, I’ve changed my way of eating and I’m never turning back. I’m down 105 pounds and am only 30 pounds from a very healthy weight. I say all that to say this…thank you! Seriously, I can’t express it sufficiently. Thank you.
great job!
do you eat l ow carb or usually stick to healthy food without thinking too much about carbs
It´s never too late.
I recently did 12 days and 22 hours water fasting. I went from 15 stone 9 pounds to 13 stone 13 pounds. I ate soup for a few days then started to eat a carb free keto diet and in ten days I am back to 15 stone. I am going to start OMAD and eat at 10am from now on. I will endeavour to get to 14.5 stone using this method. It’s all a learning experience. I was getting very lethargic from day 11. I don’t know how they do 21 days never mind 40. Maybe I will try again water fasting in 6 months. See if I can go longer.
This was very inspiring to read!
Super inspiring! Thanks for sharing 🙏
I started watching Dr Fung’s videos and learned about intermittent fasting 4 month ago and started fasting 16 hrs a day. I would not eat breakfast and start eating lunch at 12pm and stop eating after 7pm. I’m 41 and had fatty liver disease ever since I was 20 years old. I went for a routine check up and had a blood test the other day and for the first time in 20 years I don’t have fatty liver anymore. I was so happy and excited and will never go back to eating breakfast anymore.
Have you restricted your fat intake? Or you are just doing ketogenic diet?
@@aad6734 I just ate normal, protein carbs, good fats etc… I did cut out the junk food though
@@vt4508 Thank you!
Keep those carbs low, too! Eat plenty of meat.
Try taking a prolonged fast,take wheat grass juice powder and choline supplements.
Fasting takes practice. Fasting longer takes a leap of faith. I recently did a 3-day fast and broke a psychological barrier. Now, 36-48 hour fasts are normal and not a challenge. Try a 3-day. And keep trying until you get through it. 👍🥳
I hear you! I was doing 16-hour fasts and out of the blue I decided to just hold out a little longer without giving myself a definite finish line. Well, I was able to go almost 48 hours, and I didn’t feel bad at all! In fact, I had no brain fogginess or feeling of needing a nap. I found that it helped to have a shot glass of salt handy to dip a fingertip into whenever I felt hungry, a little bit of salt kept my hunger at bay.
This is great advice! Three day fasts are a good time period. I’m doing 72hr days consecutively and losing weight like crazy. You get used to the fasting really quick.
@@ledyba57386 How often do you do a 3-day fast? Just finished my first 87 hr fast and feel fabulous. It really does get easier.
@@Hollycat50 I used to to 4-5 day fasts, but I can’t sustain that. So now I do anywhere between 24-72 hr fasts. I really try to aim for 72. It’s harder when you do it dry.
@@Hollycat50 And congrats on your 87 hr fast!!!! Excellent!
Most of my life I never ate breakfast. Then I retired, and with new found time on my hands I started eating breakfast. Big mistake, I gained 30lbs in one year! About a month ago I stopped eating after dinner, and began skipping breakfast again, so basically I eat in a 6 hour window, lunch at noon, and dinner over by 6pm. I’ve lost over 20lbs already.
That is good to hear, same here. when i was a teen i was kinda of skin kid, but i was a strong athletic kid, and i almost never ate at breakfast simply was not hungry enough, after my 30’s, i started eat every day, and my weight kept on going up. I am also starting today on that regime (18 hour fasting) Plus i am hitting the gym, hopefully i will lose some kg that fast, cause i’ve got lose at least 60 lb.
Currently on a 62 hour fast and I feel great. Break that psychological barrier and keep going. You GOT this!
Im currently on a 64 hour fast. Only having water when I feel it necessary especially after an hour long sprint/walking. I have a deadline to meet by Dec. 17. I feel great. It really is the psychological barrier. Especially when other people around you are like “yo im gonna ubereats some wendys, get some spicy chicken sandwich” nd then in the back of your head you’re like “damn… Their chicken sandwiches do be slapping sometime” its having the resilience to say no. If everything goes according to plan, I will meet my deadline. Tomorrow is gonna be the first real test to see how strong my resilience is. Wish me luck.
@@UndesignatedGod That’s awesome. Good luck bro. Kill it !
@@rkslounge8117 i have a question for you, what did you do with the stomach pain? Not like your stomach growling for food, but just this constant stomach pain. Its weird cause it wasnt occurring the past days until today.
@@UndesignatedGod I haven’t experienced that actually. For me the first 2 days, it was intense hunger and then it disappeared. Try maybe drinking Coconut Water twice a day. It could help
@@rkslounge8117 ok thank you very much.
Hello Dr. Fung. I had a stroke 2 1/2 yes ago. When I was at the Rehabilitation hospital, the Nutritionist told me about Intermittent Fasting, but did not go in to details about how to do it. Just told me the different schedules. Have been doing IF since then. Unfortunately, I did not change my diet. I came across your channel 2 weeks ago and on March 20,2022 did a 16/8 properly eating 2 times. This week I changed it to 18/6 and today I am completing a 24 hr fast
I feel great
That’s awesome Ericka. I love Dr Fungs book, The Complete Guide to Fasting which has recipes and so much more in there. Best wishes. God bless🙏🏻🙏🏻
58 hours into my fast. Sick and tired of the cravings and the , if I’m really honest, over 50 pounds extra weight. I want to take back control of my appetite and this is the best way to break the physical and psychological barrier. Lost 5 pounds so far! Good luck to all of us fasters!
Wow, your doing great!
@@debann2864 Thanks! I lasted 3 days. Now I am doing 2 day fasts for each week, then OMAD for the remaining days. I refuse to become a statistic, haha. You know, when you hit your forties and you blow up. I don’t want this unhealthy body anymore
@@margaritawelch1838 you’re doing great!!! Water fasting really helped me break sugar cravings addiction and brings tons of benefits. Longest I did was 15 days. First 3 days are hardest mentally. I’d like to implement more omad long term fasting for long term weight loss.
Good luck to you! You can do it!💝🥰
@@anitaknight3915 Omigosh! I’m not sure I can stretch it out that long. But my oh my, the benefits really make prolonged fasting an option. I’m thinking the most I can do is five days, because in the weekends family expects me to eat out with them and I’d like to share my one meal for the day with them. You certainly give me inspiration to push the envelope!
I am on day 5 of a water and tea fast 😀. I was going to just do 3 days, but am feeling pretty good so kept going and now aiming for 7 days. I’ve been adding sea salt, trace minerals and electrolyte powder to some of the water in the morning. Then just plain water or tea for the rest of the day. I have lost about 11 lbs, which I am very excited about 😁 So far, my longest fast and counting!
I made it to 8 full days of fasting…I’m proud of myself and am going to let this be a good foundation to a much healthier life 🥰
I’m on day 5 of a fast. Not sure if I should keep going ..but your post is encouraging!
@@Buttersideup Excellent!!! Always listen carefully to your body. It will tell you how far to take anything 🙂
This is encouraging to hear and I’m happy that it’s worked out well for you. I have been fasting for over 24 hours now and working on my second day of fasting. I had a goal to do 5 days of fasting, but I will see how it goes. After the first day I’ve noticed some benefits and felt really good. so I will continue to try fasting for the next 24 hours.
@@Penelope416 Great job so far and best wishes 🙂
I do a 24 hour fast every Monday and a 48 or 72 hour fast once a month. I didn’t need to lose weight, but I’m very active and it’s really knocked down inflammation in my body.
Great habit!
Thankyou
Me too !! I do a 36 -40 hour fast every Monday. From dinner Sunday till sometime Tuesday. It definitely gets easier. I’ll do a longer (3-5 days) fast a couple times a year
I’ve been doing intermittent fasting for about a month and decided to do a 5-day prolonged fast. I have chronic inflammation in my chest area for more than a year, but it’s not a big deal because it only hurts when I press on my chest bones. After the 2nd day of fasting, the area of pain started getting smaller. And after 5 days, the chronic inflammation in my chest was all gone. Now, I can press on my bones hard and feel zero pain.
@@reyrey4261 That’s awesome! Let that body heal itself.
Started 18/6 intermittent fast 12/27/22 and today 1/27/23 I’m down 14lbs. No more back pain, no more inflammation in my body. My blood sugar readings are good. I’m in constant ketosis n I’m happy for that. 161lbs today and on my way down. I feel great in my body and I want to thank these doctors for showing us the tools to tap into our bodies own defense and healing.
So glad it’s working for you.. Doesn’t work for me sadly 😢 I’m on a one month with gaining only with the same method 😢
How are you doing now? I love the 18/6 IF
@@dhoward1234 what are you eating when you break your fast? Try to stay away from carbs and sugar when you first break your fast. For example, I’ll break my fast with eggs and a small amount of protein. About an hour later I’ll have carbs.
Whatare you eating on your “feed” days?
Hello Yvonne! I started 16/8 9 days ago. May I ask, what did you also include calorie deficit when you did eat like 1200?? Also, what about the headaches? Thank you❤
I am currently at 18hrs fasting for 72hr total fasting. Wow! I am so excited in making this part of my lifestyle. I’ve been abusing my digestive track for too long and I am getting back to a healthy weight. If Jesus did it for 40 days surely 3 days a breeze. May you be Blessed in health n longevity!
It’s my second day of 18/6 let’s do this
How many Times a month is ok fasting 48 – 72 hours? Once or more than once?
You smoke weed on your fast? Also I ate 4 grams of psychedelic mushrooms after fasting for 24 hours. Basically had Kundalini experience for 7 hours. Ive lost 23 lbs and have spontaneously began to speak Navajo fluently. Amazing
@@chrismc.4437weird asf
@@chrismc.4437sounds amazing 🤣
One day the Noble Prize will be awarded to this guy ! Dr Fung you are amazing !! Thank you for all you do and the countless people you have helped and are helping !
The beauty of YouTube, watching this three years later and just starting out on fasting.
How long you going to?
Well , you gotta partner to watch
through but youtube censores also a lot.
Me too!
Same here! And I’m starting a month after you 😅 gotta love technology!
I maintained therapeutic ketosis in conjunction with chemotherapy and immunotherapy but also fasted 3 days before and 2 days after 18 infusions. I RESOLVED stage 3 endometrial cancer. Thank you Prof Thomas Seyfried for your protocol which not only starved the cancer of glucose but with fasted exercise hindered glutamine from feeding the cancer also.😊
Wow
God bless you
Great!
What kind of fasting ? Is this a 5 day complete fast or a 16:8 typical fast?
@@thomasbroker69 I think it’s prolonged fasting