Fasting To Induce Ketosis

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Fasting And Ketosis Part Ii: Meal Timing

The first article in the series, Ketosis and Fasting Part I: What Is Fasting and Why Do People Do It?, defines fasting and outlines some of the many purported benefits. This next segment explores different protocols for intermittent (under 24 hours) fasting. Meal Timing While prolonged daily fasting (24+ hours) has a host of other hormonal and metabolic benefits, many people incorporate shorter fasts into their daily routine by restricting the frequency of meals. Eating fewer meals per day can result in body fat loss, a decrease in cortisol levels, along with other interesting changes (Stote et al., 2007). Reducing meal frequency—intermittent fasting (IF)—allows for the benefits of fasting without requiring the individual to abstain from food for too long. One can both fast and feed within a 24-hour period, allowing for the best of both worlds. There are a number of popular protocols for IF. 16/8 Intermittent Fasting may be the most popular introductory protocol for IF. The “16” and “8” suggest that a person does not eat for 16 hours and then consumes all meals within the remaining 8 hours of the day. One way to do this easily is to skip breakfast. If the first meal of Continue reading >>

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  1. DustinX

    Fasting to get into ketosis... faster?

    The other day I remembered that when I was young I had to get a physical. Well to keep the story short, I hadn't eaten much the day before and didn't eat breakfast before I went. After he looked at the urine results I remember him asking if I ate breakfast, he said he asked because I had alot of ketones in my urine.
    I was thinking, would it be possible to do a 24 hour fast to enter ketosis and then the next day continue a keto diet (I'm saying for when you're first starting a keto diet). Maybe 12 hours of fasting would get you into ketosis? I'm not sure, but I figured this could be a quick way to get into ketosis without having to wait 3 or even 4 days when you first begin.

  2. Eileen

    If you are young and active, then you'll get into ketosis quickly. Someone who is older or less active will take longer the first time.
    Fasting will get out into ketosis, but so will eating high fat meals. Don't know about you, but I get very crabby if I miss my breakfast.

  3. jg_girl088

    yeah it sure will. I remember reading in Good Calories Bad Calories that the original recommendation for the ketogenic diet was to start with a 48 hour fast, however, atkins was the one who changed it to a 2 week induction period of minimal carbs.

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Intermittent Fasting Vs. Keto Diet: Who Wins?

Fad diets have gained a bad rep throughout the century because of its overly dramatic yet dangerous results, too-good-to-be-true promises, and the craziness of the method. Despite the ridiculousness of most of them (like the tapeworm diet that requires you to ingest tapeworm eggs and let it thrive in your intestines for years), there are still people who try them out because of their “silver bullet” qualities. But not all fad diets are exactly bad. There are some that have actual benefits to the body, as proven by a series of studies done by reputable institutions and experts. Two of them would be the intermittent fasting diet and the ketogenic diet. Both will be discussed more thoroughly below. Intermittent fasting: food deprivation systematized Intermittent fasting or IF is one of the most recent fad diets created. This method requires the dieter to abstain from eating for extended periods of time until his or her designated “eating window” comes. It has six types: 16/8 method: fast for 16 hours, eat at the remaining eight every day. 5:2 diet: 24-hour fast for two days every week. Eat-Stop-Eat: fast for 24 hours at least once a week. Alternate day fast: do fasting every o Continue reading >>

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  1. Rcroix

    Hello everyone.
    I have been on the 2:5 for about 6 months and lost about 10kg (over 20lbs) So thank you Dr Mosley!
    A lot of the reviews of the fasting lifesyle seem to suggest that it is just a way to reduce average weekly calories, but I’m sure most of you think there is more going on than simple calorie reduction.
    During the last 10 days I didn’t fast as I was on holiday traveling and found it difficult. Amazingly I did not gain any weight. This has happend on two occasions during the last 6 months.
    I think the fasting days are forcing the body to relearn how to burn fat. I’m a bit confused about the correct scientific terms for this ‘lypolysis’ is I believe the breackdown of fats (into amino acids) and ketosis the burning of
    fat as fuel.
    What ever the terminology it seems like the fasting days teach the body a long forgotten trick of switching from available glucose derived from what we just ate, to reserves stored as fat.
    I suggest that this trait applies to non fast days too, hence the lack of weigh gain during holidays.
    I used to do a bit of distance running and am quite familiar with the concept of ‘hitting the wall’. This is when a runner runs out of glucose and has to switch to fat burning (around the 18mile mark). Often that process is difficult, I have had to sit on the ground for about 3 minutes until my legs felt like they would work again.
    I’m not running now so I can’t try a quick marathon to see if the diet has helped with the switch.
    I welcome your thoughts.
    Good luck
    Perhaps Dr Mosely could weigh in on this with some scientific evidence.

  2. zec4peach

    I love science and this is why I love the 5.2 as it makes so much sense.
    Your body will go into ketosis when fasting for a short time, this is probably why some people get headaches. It will also make you very thirsty and wee a lot as your body tries to flush out the by products from fat metabolism. This is a common symptom of type 1 diabetes but obviously they go into a severe more ketoacidosis due to prolonged lack of insulin and metabolism of glucose and start burning muscle for fuel.
    It’s quite complicated stuff but if you google fasting ketosis there’s loads of interesting info online. Michaels book was lacking in any science stuff which is a shame as I think people are interested.
    I know that athletes or very fit people are more efficient at burning fat as they are used to it so yes I think the 5.2 does reset the metabolism in a similar way.
    I have managed to this this after years of cycling and find I can ride for a few hours on an empty stomach. Always need coffee though !!!

  3. Nika

    Hey Martin!
    I’m also very interested in ketosis. I tried it out a few weeks ago and didn’t eat any carbs for 1,5 week. I lost quite some weight, but felt like I couldn’t sustain it – I started feeling really weak, dizzy, couldn’t walk straight some days and all in all didn’t get the energy boosts some people boast about.
    So now I just cut carbs on my fast days and allow myself fruit and yoghurt on normal days – still prefer not to eat rice, noodles, bread and potatoes though. Sometimes a baked good or chocolate pudding as a treat, but not regularly. I do think this really contributes to my quicker than average weightloss (7kg in 3 weeks, of which most during that first 1,5 week).
    I’ve also started working out fasted. I do this after work before my only meal of the day, so after fasting for over 20 hours. I do HIIT (Insanity), which combines cardio and strength through bodyweight exercises. So far my results have been worse than when I did the program before when eating regularly, but I’m waiting to see how it goes in two weeks when I do my second fit test. My body is most likely also learning how to switch to burning fat efficiently.
    What you said about going on a holiday, this reminded me of the “carb loaders” I know. They basically cut carbs during the week, then they “carbload” on Saturday – eating everything from pizza to ribs to whatever they want. They say that it doesn’t cause them to gain weight, because the body is still in fat burning mode and the glucose from the carbs goes straight to the muscles, giving the muscles the strength to keep working out through the next week. Hence carb ‘loading’. These people are basically in ketosis 3 days a week (it usually takes the body about 3 days to go into full ketosis).
    These are all bodybuilder types though, who do mostly strength training so it doesn’t really sound like a great idea for me. I wanna be lean, not buff.
    Anyway, long post – gonna head over to the next one

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16-8 Hour Intermittent Fasting

According to Hugh Jackman, the 16-8 Intermittent Fasting method of eating is “all the rage“. This system of eating is easy on paper – you eat all your meals in an 8 hour window, and then “fast” for the next 16 hours. Does this system really work? Is it really a fast? Will it help you lose weight faster? Let’s take a closer look at the 16-8 Intermittent Fasting method, often just called 16-8 IF, or the 8 hour diet. First of all, let’s look at a typical eating pattern: Breakfast around 7am – 8am Lunch around 12pm – 2pm Dinner around 5pm-8pm An average person eats 3 times a day with some snacks mid-morning and mid-afternoon, with around 12 hours of eating followed by 12 hours of fasting (not eating). The 16-8 method just squeezes the eating window down to 8 hours and stretches the fasting period. So if you follow a 16-8 fast you will probably skip breakfast and then have a large lunch, say at 12pm, then eat every 2 hours until 8pm, and then fast: Lunch around 12pm Protein based snack around 2pm Protein based snack around 4pm Dinner around 6pm Protein based snack around 8pm There are now several branded diets which use this eating method, one of which is the Leangains Continue reading >>

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  1. baconrun

    Changed. Post edited.

  2. Daisy


  3. BillJay


    can I use fasting to help me become fat adapted and speed up the process at all?
    Absolutely, that's how the medical ketogenic diet has been induced for epileptics for a long time.
    The only reason it's not one of the first recommendations is that fasting is too extreme for most people and it's not required.

    Good luck!

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