Does Intermittent Fasting KILL MUSCLE? (Diet Confusion)


100 Replies to “Does Intermittent Fasting KILL MUSCLE? (Diet Confusion)”

  1. I been 7 days doing IF and lost 7lbs and 1% body fat so far, why waste a ton of money and time worrying about what to eat?

  2. Every time I hear Jeff go on an anti IF or anti Keto etc rant his key point is always long term sustainability the problem is I find that eating 6x per day in smaller portions is the most unsustainable diet of all. IF is the easiest and cheapest and it has become a easy to maintain lifestyle that has given both me and my wife results we both never thought possible . I’ve reversed my pre diabetes and lost 60lbs my wife has lost 40 lbs after having her thyroid removed .
    Jeff is a great trainer and his workouts are as good as it gets but this one thing I must strongly disagree with him on .

  3. I'm next to two years doing intermittent fasting, it has teaches me to eat properly. I feel better I've lost weight and I enjoy food a lot more now. Intermittent fasting is not a joke. And you are not speaking about insulin and the troubles it makes. Besides, intermittent fasting is not a religion, is a TOOL that you can use normally and make you skip it with conscience if you feel like doing it. I don't agree here, Jeff, not one bit.

  4. I think it all depends on what time you exercise as well, in correlation with your nutrition plan.

  5. IF is the easiest and best way to set up a lifestyle without failure or feeling its hard, and for me it was the only thing that really worked, dropped 15kg by IF and gained muscle and then started to follow a normal nutritionplan when i eat 5-6 times per day with good food and lots of protein and as always i keep workout the AX programs. And the thing is, im now back on IF cuz i feel much more relaxed and focused and by the way i didnt drop a single kilo by eating in a normal eatingwindow even if it was really good food. So now to strip of the last % of bodyfat im back on IF, the AX mealplan or my wifes mealplan only works for staying in the same weight..

  6. I have been in OMAD for 10 years. I first lost 28% of my body weight, went from obese to normal, the continued with HIIT and have gained muscle all along. I was 52 when I started One meal a day and now I am 62 and feel better and athletic than when I was 30. I have the photos to show it www.feastfastforlife.com/gallery Now I am in OMAD for the rest of my life. The benefits (SCIENCE) are innumerable. To say the contrary shows ignorance of the subject.

  7. Awful lot of comments disagreeing with Jeff on this one. Although as per usual not a single one of them provides a single citation. As far as I am aware calories in V calories out is the only thing which will lead to weight loss. At the end of the day if IF works for you to control your calories then it works for you. But it's because you are eating less calories not because you didn't eat Monday (or a variation thereof).

  8. What an idiot. IF is a lifestyle. U get to eat out more and live your life to the max.
    Those typical oats, chicken breast, bla Bla Bla.
    Meal plans are a waste of time.
    Fucking moron

  9. I think it really depends on your body's metabolic rate. I tried IF for about 4 months 2 years back and yes I did lose a significant amount of weight (17KG). However I was still unhappy with the end results; my skin was loose in certain areas like the arms, thighs and belly. My chest looked terrible, somehow pointier than before and really puffy around the nipple area (I'm male so this aint good lol).
    3 months ago I started working with a personal trainer/nutritionist to work on my body recomposition and I've made more progress on my body than I could have ever dreamed of, and I just changed one very simple thing; an increase on the amount of times I eat a day. I was advised to eat high protein meals every 3 hours. This doesn't mean I ate a full meal every 3 hours, just 3 full meals plus snacks in between. I wouldn't even think of it as a diet cause I'm now eating more food per day than I've ever eaten before. That plus an increase in resistance training (weight lifting) and HIIT (High intensity interval training) should get anyone struggling to get fit pretty far. I'm 3 months in and my arms and legs have gotten significantly toned, quads are popping, biceps and triceps finally showing plus abs are very clear (on an empty stomach XD). My back changed the most, looks ripped af tho got a long way to go on my chest, but at this rate I see it happening in less than a year. Please note, I started out pretty fat, the kinda fat that turned eyes in my direction the moment I stepped into a room. I feel like IF works best for someone that's nearly there in terms of having a fit body, but i wouldn't recommend it for anyone really big unless ur pairing the diet with intense exercise. Hope this helps/motivate! (Not a professional by any means, speaking from experience)

  10. After this video I’m starting to question all the advice this bloke has given as he’s completely wrong about IF

  11. I absolutely love Jeff and feel he's legit compared to many others out there. However, women shouldn't have 5-10% body fat. I wish he spoke more on women specifically. I know there's athlean xx but there aren't any nutrition specific videos there and he does not run those. I understand a lot of nutrition is geared towards both genders and "guys" is slang some times for both genders. But I hope he can speak to some more specific female information especially on nutrition.

  12. The problem with athlean is that he believes only his protocol is legit and all the rest is fad . Specially when he has not even tried any of them .

  13. To me each of these protocols except for Juice Diets, can be sustained for many many years, and it really comes down to individual and personal preference.

    Interment Fasting – 16/8 protocol is easy to do for the rest of your life. But some people want to do OMAD cause they want their big one meal. That is how they like it.
    IIFYM – this is is literally a middle finger to all diets out there, so what can be hard about IIFYM is unclear to me.
    No Fat – there are people who dont like fat, like myself. Who could not care less about fats in their meals.
    Keto – there are people who like fats unlike myself, who can eat 70 % fat and feel very happy.

    Healthy balanced eating without these protocols maybe the optimal and "normal" way of eating for most people. But there are many many other people who dont feel that way.

  14. Hello Jeff . With the I.F how much I can wait before to take my first meal in the morning after my fasted workout? 30-45 minutes or close to 2 hours ? I'd like to complete my 16/8 protocol after my workout but I don't want to take my last meal at 4 p.m so I can eat at 8.am. thank you

  15. If intermittent fasting works for you, it works for you. But I don’t believe in fasted workouts. How can you maintain the same energy levels that you otherwise would have were you not fasting?

  16. You need to educate yourself more and face the fact that the things you're putting down work. You just told on yourself. You've asked 1000 people to do food diaries and a handful did. That's old school and has not solved any problems for decades. Best wishes

  17. IF helped me a lot when im working out and building muscles. And so are a lot people even in this comment section

    GET YOUR FACTS STRAIGHT JEF

  18. Intermittent fasting a fad? The long term practicality of it? Heres the answer. autophagy. Growth hormone. Reduction of inflammatory cytokine expression and oxidative damage

  19. What's up Jeff, would you revisit intermittent fasting in a new video? Have you your views changed at all?

  20. what are enemens? XD that cracked me up. But yes M&ms used to be my guilty pleasure too haha love your videos Jeff!

  21. I eat one meal a day and will continue to eat one meal a day. For me it’s a lifestyle not a diet. I work out, cardio or heavy lifting, I do physically demanding jobs, what ever I do I eat one meal day and feel amazing. Give me my protein, veggies, and fats and I feel great and have energy

  22. Love this guy man, but I just don't agree with this one. I've lost 35 pounds and have fell into a very rewarding, comfortable and easily sustainable lifestyle concerning eating habits. I've also cured my heart burn, skin problems and sleep apnea. Following his workouts and IF has literally changed my entire life.

  23. Yea, people back in the day when had a meal once every few days lost lots of muscle just because they didn't eat every few hours :))) That's not how it works.

  24. Everyone in disagreement looks nothing like him and doesn't have the credentials or trains professional athletes lol. Let's listen to you guys

  25. The reason people see such great results with IF is because instead of Hardee's biscuits and Bojangles you're now skipping breakfast. Obviously you're losing weight

  26. Use it to "cleanse" than eat right later. It's much easier to eat 2 meals a day than 5 small ones. But I've done the 5 small ones, and that also worked. Idk, just do you.

  27. If and long fasts have been my lifestyle for the past 2 years. Totally sustainable and the benefits are outstanding. Truly life changing

  28. I believe that intermittent fasting would not work for a person who is shape like Jeff is but it would for someone who is obease. IF is a good way to mobilize fat as energy but if you you have a low fat percentage then I can see IF as counter productive for muscle.

  29. Jeff – do you still feel the same way about intermittent fasting? Do you feel this way about all of the different types of IF? Like the 16/8, 20/4, 5:2, etc. I hope you do a follow-up video on this.

    Thank you,

    -Kris Kilpatrick
    MS in Applied Exercise Science

  30. Jeez. This was the most painful Athlean vid I've ever watched. Title is completely wrong. Doesn't even talk about IF and implications for muscle growth. Then he says IF/atkins/fad diets are only invented to make people money and shortly follows that up with "I don't need IF due to being busy. I just [SHAMELESS PLUG] drink some Athlean x Protein powder." Paraphrase. Totally fine with plugs, but not right after shitting on various nutrition plans because they only exist to make money for others.

    I love ya Jeff, but this was the worst Athlean video I've seen. Out of, I dunno, 200, 250.

  31. Mate you are on the juice.so its easy for you but there are people like my self who has tried every diet for 30 years .nothing work to loose the last 5 pounds of stubborn fat. Finally with intermittent fasting i m seeing result. There is the fact.

  32. Yo.. stop saying shit. Eggs are in no fucking way a health food. Educate yourself. Nothing healthy about eating animal products.

  33. Im doing 16-8 for a month now with no cheat days. Will keep u updated 😀 Also avarage fast 17h and have lost 3kg while gained some muscle (from working out ofc)

  34. I think you are getting push back on “IF” because it’s not a diet…it’s a eating pattern that has very well documented health benefits. For example, I have suffered with IBS my whole life. I also have been weight lifting for many years (I’m 46) Bloating and gas have been a problem most of my life. I then realized that I was never really giving my body a break from eating. Doing the 5-6 meals a day thing most of the years training. I then started taking a 16 hour break from eating and still getting my 3000 calories. IF is not a diet fad. I do it with intention of GAINING weight, but more importantly saying healthy

  35. Going on my third year IF and Keto . I feel so good I will never stop. Dont knock it till you try it. Jeff you are not a nutritionist, you are greeat at Physical therapy and Training but you are clueless when it comes to Nutrition.

  36. Another video that was ahead of its time. There are many videos a couple months to a year old but this is from 2014 and still at the top of the search results.

  37. The comments… the irony and arrogance it takes to actually question or even attempt to condescendingly educate someone who supposedly is far more knowledgeable, lol.

  38. I disagree with what you said, Jeff. Tons of research and people experiences have shown that IF actually reduce hunger and by reducing hunger, those who tried IF have a better time sticking to their nutrition and live a healthy lifestyle.

  39. Love Jeff however……you didn't answer the question "does intermittent fasting kill muscles" I would say no but would have liked your take on it. It seems to be the most natural thing to do and free.

  40. I found the video that makes me question Jeff. Soley with regards to IF… I hope you've educated yourself the years that followed this video. If not, start with Dr. Fung and expand your knowledge. IF is literally a life saver… not only short term… for life.

  41. I think at the end of the day, we all have different genetic predispositions. Listen to YOUR body, and don't do off someone else's predetermined schedule! Your body has its own processing rate.

    It's as simple as this — if you're not hungry, don't eat! Don't eat because some clock has reached a certain hour, eat because your body is telling you it's time. After that, pay attention to the quantity and ensure it's following the scientific principles in order to arrive at desired outcome. But don't worry about when!

  42. Intermittent fasting is absolutely a lifestyle that can work. You’re literally just eating inside an 8 hour window to control your insulin levels

  43. Water Fasting for even over 24 hours isn't going to do anything negative to your muscles. In fact, Water Fasting for a longer period of time has shown to increase the human growth hormone by a lot for that period of time! 🙂

  44. It's funny when this appeared as a trend, I've been doing this pretty much all my life unintentionally. I've struggled with gaining weight though, so now making adjustments I e incorporating brealfast. It's not hard once you're used to it, in fact eating in the morning is a real struggle for me as I'm just not hungry.

  45. So it never addressed whether or not I.F. actually has an effect on muscle development. It's just a rant about diets. I'm all in with Jeff's overall philosophy but in this case, I've had no problem being an I.F. lifestyler for over a year and I've lost over 50lbs of fat and continue to grow muscle and look better. The key is, you have to eat good stuff and like Jeff, I don't cheat and I don't use I.F as a crutch to eat garbage just because my body is in a fasted state for 15-16 hours a day. Do I occasionally eat early? Yes. Do I occasionally eat late? Yep. But the consistent thing is that I am very careful what I eat, when I eat and make sure to pack in the RIGHT calories, proteins, veggies, etc in that eating window. I totally get the concept of fad diets and people not turning it into a lifestyle but that isn't me.

  46. I love intermediate fasting. It really helps me to in caloric deficit, and the best thing is that I can make my portion size according to my own level of hunger. plus I can build muscle with it. It also helps me to be more cautious with my calories, and ending my days in a calorie deficit. I can easily live of this no problem

  47. I love what you do, but I don't think you understand intermittent fasting, I come from a very large group of people who do intermittent fasting. We run the spectrum from vegetarian(me) to my brother who does keto. i have been doing it for over 10 years( it wasn't called intermittent fasting back then, we just didn't eat after 6:00PM). it is an life style for many people, and i think it incorrect to call it a diet. keep up the great work.

  48. i've been to IF for two years, i feel thats the best thing i've done in my life for health and well being, also it is good when traveling and a lot easyer to eat clean as i dont have to eat very often.

  49. I don't agree. I am not on a diet, but I follow a keto-like eating plan which includes IF, fasting and one meal a day. You have to switch between these, and have at least one day of 3 meals per day.
    So to do IF every day is actually not recommended.

  50. I do intermittent fasting and I gain muscle and lose fat , now is more than one year that I skep dinner and I feel super good , This is a best life style and is free

  51. I did intermittent fasting 16:8. It is working for me. People may think it is complicated and hard. But I myself feel it like I jus don't eat anything at night after dinner 8pm and skipping breakfast. That's all. I eat my lunch at 1 pm , some snack at 4 pm and dinner at 8.

  52. Big supporter of athleanx and have even bought the program. This is the first video I truly have to disagree with , . Intermittent fasting is great and truly sustainable. There is research that proves you don’t lose muscle and in fact burn more fat if you workout in a fasting state. Maybe you should do a remake

  53. Intermitten fasting first come from muslim ppl. They use to make study to show the world how great the religion because fasting in ramadhan give superior benefit. Even some of my muslim internist teacher use to say base on their research in fasting giving great benefit, so islam is the best religion in world.

  54. I did IF for years without even knowing cause I hate eating when I wake up so I wait a long time before first meal.

    So it’s really not hard long term… I don’t think it has any of these amazing benefits people talk about but certainly can hjelp manage calorie intake

  55. I was doing intermittent fasting (more than 8h gap between the meals), without knowing that, for 12 years of my school and I think, it is very much sustainable, if you are immersed into your work for those 8h.

  56. I usually like your videos but this one I don't agree with.

    I highly doubt ANYBODY follows the same diet for 30 years, that's a pretty poor argument!

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