What 12 Years of Intermittent Fasting Did To My Body


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41 responses to “What 12 Years of Intermittent Fasting Did To My Body”

  1. Does the book include the details about protocols and plan on how to do fasting correctly? Or it only cover the study’s?

    What is the best and updated content on how to do fasting?

  2. Lean from 84 kg to 78 kg because endurance exercise, less body fat, but also perhaps because of less/no creatine, which essentially stores water in your muscles accounting for a few kgs difference alone?

  3. I rarely comment on youtube, but I’ll make an exception here.

    Siim, I’ve watched quite a few of your videos now and they’ve been incredibly helpful in optimizing my own longevity protocol. You’ve become my No. 1 source for this kind of content. Your style of summarizing the most relevant information is ideal for people who value their time.

    Thank you very much for putting all of this together!

  4. Your experience with IF mirrors my own. Have been doing 6/18 for 8 years with excellent results in terms of staying lean and retaining good biomarkers. I also do resistance work 3 times a week + cardio 2 or 3 times a week, and haven’t seen any significant indication of muscle loss. My results from IF are so good that I would continue even if I experienced some muscle loss. IF has literally improved every biomarker and also blood pressure. Also, I believe that over time we’ll find more and more critical benefits of autophagy…..benefits unattainable via any other lifestyle changes. Just my opinion, but I’m guessing those who do regular IF are much less likely to suffer disease and there’s likely longevity benefits as well. I’m completely sold on IF.

  5. At one point, I used to watch Dr. Brad Stanfield’s videos because they actually had some tidbits of interesting and/or useful information. Now, he’s looking to grow his YouTube channel while also climbing the ladder as a healthcare insider so it’s mostly just feeding on controversy and always tips towards the (rather biased) mainstream medicine zeitgeist. I can’t blame him, he’s got kids and a lifestyle to support and more on the way apparently. None of those come cheap.

    • Agree – although I struggle to believe he always looks like death warmed up – purely because of the kids.

    • I think he seeks this role, because there is not really much new and interesting that comes out that actually works, that actually has a lot of proof behind it, so he ends up talking about the same things all the time, including criticising others that push things with little proof.

  6. I’ve done OMAD. Same calories as 5-6 meals a day. 2-3 weight training +2-3 zone 2 cardio. For more than a month. I’ve never been flatter.

  7. Over one year I lost 15 kg, of which 1kg was muscle mass loss. This is of course because I did not do enough steps nor enough weight lifting. But the other benefits of Intermittent Fasting for mental health, focus, overall well being, quality of sleep, etc make it so that I will continue. I have also reduced carbs, since for me carbs should be proportional to intense sport. As long as I do not do enough intense sports, I should keep carbs low (or else weight increases, mostly fat). weight is no more my focus, now I would like to increase weight lifting and add muscle mass.

    • @@unjaded2 Totally agree, either payed off by the Food Industry
      and or Big Pharma. Blind trust in the medical community is GONE .

    • And Dr Attia is still a statin pusher (hint if youre reading this, Statins are a complete scam. They have an absolute risk reduction of under 1%, factually undebated in the science) and theyh have significant deteriments. Lastly, many studies have been done showing that people well above the “healthy cholesterol level” have almost no increased chance of cardiac arrest. Its simply a false model but still pushed for $$ sake

    • Exactly – I commented the same. Siim needed to mention that here. It’s the longer fasts that sarcopenia becomes an issue.

    • If memory serves well Dr Attia had a crazy fasting regimen. With at least one quite long extended fast per month and multiple fasted days every week in an intermittent fashion.

  8. I do not know how you can do fasting. It is exhausting and absolutely torture for my body and brain. I better eat less some days. But still have some food. ❤

  9. An incredibly important but almost always overlooked variable with fasting is *digestion/digestive efficiency:*
    Fasting, ie, big meals won’t work for people with poor eating habits such as inhaling food without chewing or combining useless fluff with protein like bread/rice, useless salads or drinking soda with meals etc that only serve to impair proper protein digestion. Say OMAD for such people would be a disaster. Digestion is not magic and steps must be taken to ensure it actually happens, especially with big meals.

  10. Did you know Valter Longo says fasting any longer than 12 hours is dangerous for the heart and the formulation of gallstones? He is the only one I’ve ever heard say this but I really respect his opinion so it has always concerned me to go 16 hours, even though I feel best fasting 16-18 hours per day

    • I have thought about this. If you go longer than 12 hours fasting and eat a small (under, say 50 calories) amount of nuts, or some kind of fat, wouldn’t you still stimulate the gallbladder yet stay in a fasted state?
      Edit: genuinely curious. I don’t want gallstones.

  11. It worked for me. I used Siims TIF protocol. Took a break but now gonna use it again. Its a tool for your tool box.

  12. I found that Siim’s TIF worked well for me. As he points out, its a tool for your toolkit, not something to blindly follow for the rest of your life unless you have a reason.

  13. You’re young. Have studies been done on older people? The benefits and detriments may be different for people in different age ranges.

  14. Did you mention fasting beyond 16 hours though? That is mostly what has been criticized as not worth it – like 24 hours or more – or like 3-4 day fasts that people think help their metabolic health. The benefits are questionable but the lean muscle loss is real. Especially if you are older- that muscle is very hard to ever get back. So yes, 16 hour fasts are fine – but beyond that is questionable.

  15. I have been doing 2 meals a day , intermittent fasting for past 4 years, I have only felt better and better

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