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'sleeping fast' vs 'waking fast'?

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  • 'sleeping fast' vs 'waking fast'?

    Is there any (fat loss) benefit to a fast from, say, 8pm until 1pm the next day over a fast from 7am until 7pm?

    Would one burn more fat being active through the day, or does the body break down fat better at night?

  • #2
    I can't speak directly to your question about fat burning but I can tell you that when I fast I do like to be asleep for a large chunk of it. That makes it easier not to cave and end the fast early
    Obligatory Intro

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    • #3
      No your body wont burn fat during sleep, it will run off stored glycogen.

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      • #4
        wrong, your body will run off of glycogen and fat during sleep. in fact liver glycogen will only fuel the brain - that's it. the rest is fueled by palmitic acid.

        as for the benefits, vis a vis fat loss, you'll likely burn more fat while being awake, simply because you're moving more.

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        • #5
          I find it's easiest to sleep fast. A 16 hour IF is a breeze when you eat dinner at 6 in the evening, and then nothing until 10 or noon the next day!
          --Trish (Bork)
          TROPICAL TRADITIONS REFERRAL # 7625207
          http://pregnantdiabetic.blogspot.com
          FOOD PORN BLOG! http://theprimaljunkfoodie.blogspot.com

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          • #6
            Originally posted by jakey View Post
            wrong, your body will run off of glycogen and fat during sleep. in fact liver glycogen will only fuel the brain - that's it. the rest is fueled by palmitic acid.

            as for the benefits, vis a vis fat loss, you'll likely burn more fat while being awake, simply because you're moving more.
            I believe the body creates palmitic acid from stored glycogen, it does not liberate FFA's to run on.

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            • #7
              Originally posted by Zach View Post
              I believe the body creates palmitic acid from stored glycogen, it does not liberate FFA's to run on.
              I'm not an expert, but I'm pretty sure that's not how it works. From what I've read, glycogen is used for short bursts of activity or for tissues that preferentially burn it like the brain and red blood cells.

              I'm fairly certain that most of the fat burned during an extended fast comes from adipose tissue. It is liberated vis lipolysis.

              It just wouldn't make sense to convert glycogen into palmitic acid. I don't even think it's possible since glycogen is just basically glucose. Even if it was possible, it would require more energy input than was generated by it.

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              • #8
                We are all fasting as we sleep, once any food has been digested. That is why the first meal is called break-fast. I think it is beneficial for fat loss to use the sleepinh hours because you will get more hours of fasting more easily than white-knuckling it through a long, hungry day. Also, how else are you going to get a 20+ hour fast in if some of it isn't while you sleep?
                Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.

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                • #9
                  Doing it during sleep just sounds much easier, at least for those who've never IF before. I can see how you'd burn more during the day, but I don't see there being an incredibly huge difference between night and day IF.
                  Earthy Mama's Journal

                  "Let food be thy medicine and medicine be thy food" ~ Hippocrates

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                  • #10
                    Originally posted by sbhikes View Post
                    We are all fasting as we sleep, once any food has been digested. That is why the first meal is called break-fast. I think it is beneficial for fat loss to use the sleepinh hours because you will get more hours of fasting more easily than white-knuckling it through a long, hungry day. Also, how else are you going to get a 20+ hour fast in if some of it isn't while you sleep?
                    Yeah, it's hard to do anything that even qualifies as a fast without it encompassing some awake time and some sleep time. I agree with using the timing to your advantage. I like to break the fast later in the day, so I wake up already in a fasted state and not feeling hungry and just don't eat until the afternoon.
                    The Champagne of Beards

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                    • #11
                      Sleeping fasts seem to be working for me. I, for one, find it exceedingly difficult to break a fast while I'm sleeping. I suppose you could try falling asleep with increasingly larger amounts of food in your mount until you choke to death and when you wake to getting the Heimlich maneuver from your spouse you'll know you've gone too far. Edible pillow maybe?
                      http://www.facebook.com/daemonized

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                      • #12
                        Here's my two-cents...

                        I've always been under the impression that in the healthy individual, all calories are accounted for by the brain as they enter the digestive system and bloodstream. If everything is working right, when you go to sleep that night, your metabolism will increase or decrease depending on needs. During sleep, things like autophagy (cell maintenance), brain repair, nerve repair, muscle repair, etc... occur.

                        Bodybuilders biggest gains in muscle size occur while they sleep, people on fat-loss diets experience biggest fat-loss drops when they sleep.

                        I don't think the magic of fat-loss while sleeping is a function of the mandatory fasting, but a function of physiology. That's why it's so important to be sleeping well--it's a tenet of the Primal Blueprint!

                        It's also why small things like eating breakfast regularly, avoiding blue light after sundown, and not snacking between meals/before bed are important.

                        Constant overeating and ignoring fullness signals destroy this natural cycle and lead to visceral fat stores and metabolic syndrome.

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                        • #13
                          Originally posted by Daemonized View Post
                          I, for one, find it exceedingly difficult to break a fast while I'm sleeping.
                          You're not trying hard enough
                          The Champagne of Beards

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                          • #14
                            Originally posted by Zach View Post
                            I believe the body creates palmitic acid from stored glycogen, it does not liberate FFA's to run on.
                            no, de novo lipogenesis from carbs will create palmitic acid, but glycogen does not. liver glycogen fuels the brain, that's it's purpose. FFAs fuel the rest when you sleep.

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