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Dr. Tallis Barker, D.Phil., Nat.Dip., NA.Dip., Naturopathic Water Fasting Consultant & Coach

36-hour water fasts: a beginner’s guide

Expert Water fasting coaching with Dr Tallis Barker? D.Phil, Nat.Dip

CONTENTS:

  • Introduction
  • The benefits of a 36-hour water fast
  • Beyond the 36-hour water fast
  • Dietary preparation and refeeding

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Introduction:

Most people in the modern world have never gone a whole day without eating. You too? If so, a 36-hour water fast is the perfect way to begin your journey into water fasting.

I remember when I did my first water fast many years ago. The plan was to eat dinner, then fast through all of the following day, breaking my fast with breakfast on the day after this. This format is ideal for anyone wishing to try out a 36-hour fast.

Psychologically, the experience was hugely challenging. Like most people, I’d hardly ever even skipped a meal in my life, and the idea of not eating anything for a whole day seemed almost inconceivable. Every time my stomach rumbled, it felt like the end of the world: I was going to starve! Of course, logically I knew that I wouldn’t, but the rational mind so easily collapses when your deeper, instinctive emotions emerge from out of the subconscious. By the evening, all I could think about was food – and then to make matters worse, I had to go to bed on an empty stomach…

In the end, though, I did it. And so can you. Anyone can survive 36 hours without food!

So why put yourself through such a terrible ordeal 😉 ? (By the way, contrary to my own experience, many of my clients do actually enjoy their first fast, feeling full of energy and without existential worries.)

The benefits of a 36-hour water fast:

There are at least four important reasons to face your fears and reap the benefits of a 36-hour water fast.

1.

The first reason is psychological. Precisely by facing your fears and emerging victorious on the morning following the fast, you become a stronger person. We all have a built-in survival response. By breaking the psychological barrier of no food for a whole day, you’ll find that the next 36-hour fast goes much more smoothly. Equally important, almost all my clients find that this empowers them to move on to longer water fasts in which the body’s healing metabolism can be unlocked more fully.

2.

The second reason to practise 36-hour fasts is physical. You give your digestive system a break for a whole day. It can rest and recuperate. This is hugely beneficial for maintaining health and to prevent aging. To a degree, intermittent fasting (time-restricted eating) elicits many of the same benefits, but 36-hour fasts takes this to the next level. In particular, you give your stomach, liver and pancreas much more downtime from having to synthesize digestive enzymes, a process which otherwise consumes a high degree of biochemical energy. To put it in perspective, a 36-hour fast gives your digestion double the rest time of most intermittent fasting protocols. In addition, this also means that other well-known benefits of intermittent fasting – such as the stabilisation of blood glucose (along with reducing insulin resistance) – can go much further by practising 36-hour fasts.

3.

The third reason bridges physical and psychological factors. A 36-hour water fast gives you the first opportunity in your life to truly experience ‘going to bed on an empty stomach’ on the second night of the fast. Just as it was a big deal for me the first time, so most of my clients find the same. Even people who practise OMAD (one meal a day) don’t really have to face this fully. Although the idea of the proverbial empty stomach may feel a little frightening for the first time, it’s also a hugely important rite of passage. By the second night of a 36-hour water fast, your glucose levels will have significantly dropped after 24 hours of fasting. This is because your body has exhausted its supply of both dietary sugar directly from the GI tract and digestion, as well as energy from a stored form of sugar called glycogen, which is held mainly by the liver and in muscle tissue.

For many people, this depletion of carbohydrates at around the 24-hour mark sets off psychological alarm bells which can make it hard to go to sleep the first few times. If this happens to you too, know that you’re not alone, and that it will resolve with enough practice. For instance, when I fast now, I sleep like a baby at this point – precisely because blood glucose is low, and so there’s not much energy in the body to keep me awake! (continued below)

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Beyond this issue, the ‘need’ to go to sleep with a full tummy often relates to deeper psyschological issues relating to feelings of insecurity and safety. Through practising 36-hour fasts, you come to realise that it’s okay: you really don’t need all that food to feel safe enough to fall asleep. In fact, when you’re free of emotional baggage, going to sleep on an empty stomach can actually feel surprisingly quiet and calm, given that there’s no active digestion taking place behind the scenes.

4.

Fourth, and perhaps most importantly, fasting for 36 hours means you prompt the body to begin unlocking its healing metabolism. First and foremost, the drop in blood glucose levels triggers ketosis: the process through which your body draws on the fatty acids held in adipose (fat) tissue as a source of fuel, now that the carbohydrates which usually power your body have become depleted. (This process is described more fully in the article on the 3-day water fast.)

There are multiple reasons that you can heal while in fasting ketosis. Firstly, the body sequesters and stores many fat-soluble toxins in adipose tissue, where they can’t interact with other cells of the body, thereby causing damage. It is only through fasting ketosis – through drawing on the fatty acids stored in adipose tissue – that these toxins can also be released and excreted from your body. Secondly, after about 24 hours the energy otherwise required for digestion can be redirected elsewhere, which here means towards detox and healing. Thirdly, with no food going in, your body also starts looking for other alternative sources of fuel. This means breaking down both damaged tissue as well as intracellular components which can be degraded and recycled: a process otherwise known as autophagy.

Beyond the 36-hour water fast:

To complete the switch over to fasting ketosis you need at least three days, which is why it’s so important to learn the 3-day water fast at some point. But don’t rush into anything too soon! If you don’t feel ready to fast for three days, keep practising the 36-hour fast. If 36 hours feels too long, then try 24 hours instead. You can begin a 24-hour fast after eating dinner and then break the fast with dinner the next day (lunch to lunch is another option). 24 hours does less to nudge the body into ketosis, but you’ll still benefit from giving your digestion a rest as well as from a level of detox which surpasses anything in everyday modern life. If a weekly or fortnightly 24-hour fast feels too much, then perhaps you should try intermittent fasting instead.

Whatever you do, your body will thank you for it!

There’s always a way forward with fasting, and I’m here to help if you need.

Dietary preparation and refeeding:

One final note: there’s no need to prepare for a one day fast by changing your eating habits beforehand. Likewise, you don’t have to transition gradually back to eating normally afterwards.

Related articles:

The webshop offers downloadable fasting plans and guides to help make your water fast a success.

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141 responses to “36-hour water fasts: a beginner’s guide”

  1. Been curious about fasting and am for the last 3 weeks doing intermittent fasting of 20-24 hours. Today I am contemplating just doing a 36 hour fast to see how I feel. Ultimately either a 42 hour fast or in the future a 3 day water fast could be in the cards. The best part is I am overweight and have been seeing some weight loss movement. Hoping metal clarity will come at some point. Right now, I feel more like a box of rocks. Ha!!

    1. Thanks for sharing, Brock. Yes, mental clarity will definitely come at some point, so hang in there! It’s just a question of time.
      Tallis

  2. Dear Tallis, Thank you for sharing your knowledge and wisdom with us. I have a question regarding amaroli during fasting i.e. if it is advisable or not. My apologies if you have already answered this previously. Thank you.

    1. Hi Rajram,
      Good question, and no need to apologise :-).
      If you already practise amaroli in everyday life, there’s no need to stop during a fast. However, you might consider reducing the amount drunk as part of amaroli. First, during a fast your body’s senses are heightened, and so you’ll need to drink less in order to achieve the same result. Second, since you’ll be excreting toxins, you don’t want to end up drinking too much of this back into your body. A little bit going back into your body is fine – in fact, it’s good for your body to get the feedback. But go easy on it at least in the beginning, until you know how you’ll react. You can always gradually increase the quantity later.
      All the best,
      Tallis

  3. While i am fasting can i take my meds daily ,thyroid med ,bp. Meds & antidepressant

    1. Hi Kim,
      Thanks for your question. I’m afraid, as with any medical issue, it would be irresponsible of me to advise you without knowing your full background – and that isn’t really something for the comments section here. What I can say, though, is that (1) fasting CAN be used to address thyroid issues, (2) it CAN be highly effective in treating high blood pressure (especially when followed up with a change in diet and lifestyle) and (3) it will certainly have an effect on you emotionally, which, of course, relates to the antidepressants you’re on.

      Whether or not you should stay on your meds, come off them completely or take a reduced dosage depends on the severity of each condition, as well as the length of the fast you’re planning.
      Hope this helps,
      Tallis

  4. Kalyan krishnan Avatar

    Hi Tallis,
    I just happened to come across your site today and it’s a great site. I just finished a 36 hour fast (today, New Year Day – 2018). I am 73 years old and I read a lot about health matters – particularly the natural methods, as opposed to supplements. I am convinced about the benefits of fasting. I have been doing water fasting on and off – not very regular, but once in 4 months or so. I feel very good after a fast.

    I want to do two things – make this fasting regular – say once at least every month. Secondly, I would like to go on a 72 hour fast. I am confident I can do it, though not very sure if my family members would allow me to do so. I am quite healthy and do not suffer from any chronic problems. I exercise daily (push ups and some yoga) and go for walks (3 – 4 miles0 weather permitting and do pranayama & meditation.
    I need your views and advice on the two points mentioned.
    Thanks
    Kalyan krishnan

    1. Hi Kalyan,
      Glad you’ve discovered and experience the benefits of fasting. It’s never too old to begin fasting. Fasting is so completely natural and naturally human, that we’re all capable of taking it up, regardless of age and state of health. Glad to see, though, that you keep yourself fit too :-).

      Regarding your questions, I would answer you in the same way that I’d answer literally anyone else.
      (1) About the 36-hour fasts: absolutely, continue with them as often as you like, up to a frequency of once a week (which isn’t to say that you should feel compelled to do them this often).
      (2) About the 72-hour fast: even though we’ve never met, I’m absolutely sure that you can do this. Period. If your family is nervous, though, one possibility would be to do a two-day fast first. Hopefully, this would prove to them that the jump up to three days (72 hours) isn’t such a big deal. It would also give you a taste of what it feels like to push into the beginnings of ketosis. I wouldn’t recommend doing regular 48-hour fasts, as these don’t get the job done in terms of fully establishing ketosis, but if it’s a question of calming loved ones, then this has its own value.

      Hope this helps,
      Tallis

      1. Kalyan krishnan Avatar

        Many thanks for your wonderfully clear reply. I will continue with my 36 hour fasts and may be try the 72 hour fast within a month. I will keep you posted.
        Thanks again

  5. Hey!i want to ask something! If i do a fast for 36 hour, my metabolism will be slow and after 36 hours will i get all them back?
    And if i lose my weight, it will be all fat? Thanks 🙂

    1. Hi Aaron,
      Thanks for your question. 36-hour fasts aren’t really about changing your metabolism and burning fat. Actually, almost all of what you’ll be doing is burning up your glycogen stores, which precedes the switch over to ketosis and fat-burning. Rather, the benefits of 36-hour fasts mostly concern giving your digestive system a break and allowing a gentler degree of pre-ketosis detox to take place.
      All the best,
      Tallis

  6. Pre (fontaine) wannabe Avatar
    Pre (fontaine) wannabe

    Hi. I will finish a 32 hour fast tomorrow morning. Mostly for religious reasons , but I am also curious how a bi-weekly (once every other week, Friday night to Sunday morning) will benefit my long term health as I get into my late 40s.

    1. Hi,
      A bi-weekly 36-hour fast will definitely help as you begin to age. It’s like regularly maintaining a well-loved and ageing car :-). The periodic rest to your digestive system becomes increasingly important as metabolic rates begin to slow into middle age – and especially since so much illness begins in the gut. You also provide a regular, gentle degree of detox with each fast. Don’t expect to see any miracles overnight. Rather, you’ll be contributing to a subtly improving baseline of health: hopefully something noticeable over the months and years ahead.

  7. they say that it typically takes between 5-6 weeks before you can be fat adapted and thus, reap all the benefits with regards to ketosis…3 days isn’t sufficient I don’t think…

    1. Hi,
      You’re talking about (and mixing up) two different things here: (1) ketosis and (2) fat adaption. Make no mistake, within three days of water fasting EVERYONE burns fat through ketosis. Being fat-adapted refers instead to how you digest food in your everyday diet. If you switch to a ketogenic diet (in which the vast majority of calories come from fat and not carbs/sugars), it can take 5-6 weeks to become fully and efficiently fat adapted. Before this point, you’ll feel weak and tired. If you want to become fat-adapted through a ketogenic diet, I’d suggest starting with a three-day water fast, as this will jump-start your fat-burning metabolism. After the fast, it should take much less than 5-6 weeks to feel full of energy because you’ve already accessed a good degree of ketosis.
      Tallis

  8. Hi! I just came across this site today. I was having abdominal pain after a cold and then after a large meal Monday night ended up with horrible GI burning and diarrhea (sorry, tmi) so I fasted from that night to now, and estimate it’s been 41 hours. I feel better than yesterday. I also did a coffee enema last night, which further pushed things alone quickly. I’ve lost 7 lbs! But I’m still having some of the burning cramps, though not as bad. I’ve had ginger water and a bit of broth to test…for further healing should i keep fasting? The cramps are much milder and I don’t want to interrupt healing! I also took a small dosage of potassium due to the enema

    1. Hi Jackie,
      Oooo, that sounds nasty! Hope you don’t mind me saying so :-), but it also sounds like your body’s been objecting to the way you’ve been treating it…

      Colds and viruses often play with our sense of appetite. My take on this is that: abdominal pain + large meal = recipe for further problems. Sometimes colds can make you feel hungry, but, as I see it, this is often a kind of trick by the offending virus to make you eat more, which can then provide a more suitable environment in the gut (more acidic and anaerobic) for the virus. Isn’t that insidious?

      Glad you feel better, and I hope that by now you’re 100% healthy again. To answer your question, there’s no clear best answer here. Fasting is definitely an effective means for fighting off viruses – and it’s what I do myself whenever I feel the slightest sense of one in my system. Consequently, I haven’t been ill in years. However, in order to increase your chances of success, (1) you need to practise regular fasting and (2) the more you leave your body alone during the fast the better. Throwing ginger water, broth, potassium and coffee enemas into your body only gives your body more things to deal with, distracting it, instead of letting it focus on its own natural healing mechanism.
      All the best,
      Tallis

  9. (HEALTHY MALE AGED 44 – 7 kilos overweight non smoker).
    I’ve done a few 24hr water fasts over the last six weeks – one per week – and am losing weight gradually as part of a non-processed food, low calorie balanced good diet with moderate 1-2hrs walking/cycling exercise each day.

    I’ve nearly done 36hrs and am considering continuing on to do maybe 40-48hrs, and would like to know what the general and specific health benefits there are in extending my intermittent once a week fast to 36-48hrs as opposed to 24hrs please?
    I feel great!
    Thank-you

    1. Hi Leon,
      Thanks for writing.
      First, good for you for deciding to take control of your life to reduce your weight and increase a healthy lifestyle.

      To answer your question, I wouldn’t advise increasing the length of one-day (36 hour) fasts to 48 hours. This will only push your body beyond its glycogen stores but not to the point of fully establishing ketosis. Instead, you’ll end up metabolising your muscle to get through the second day.

      I’d advise sticking with weekly 36 hours or, if you feel comfortable, trying less frequent 3-day fasts in which you more fully establish your fat-burning metabolism (ketosis).

      Also, do keep up with your exercise routine. This is as important as fasting in terms of losing weight and maintaining a healthy lifestyle.

      All the best,
      Tallis

      1. Many Thanks
        The less frequent 3 day smyou mentioned – is this 72 hrs ??

        1. You can do a three-day fast for 72 hours, say dinner to dinner three days later. The concept also includes the possibility of what is really a 3.5-day fast, say dinner to breakfast at the beginning of the fourth day. There’s no “rule” here, but it would be worth making this kind of fast continue for at least 72 hours, to ensure you’re really getting into some proper ketosis.

  10. Hi, do you have any information on the impact of fasting on cholesterol levels? I’ve been doing a 24hr or 36hr fast every week for the last 4 months and have notice my total cholesterol level going up. I suspect that it’s causing my triglyceride level to rise. Thanks!

    1. Hi Mark,
      Fasting does impact on cholesterol levels, especially during a fast, often causing the total cholesterol level to rise. However, this tends to return to normal soon after the end of a fast and is nothing to worry about, given that the rise in cholesterol is most probably due to the body breaking down arterial plaque into the blood. In any case, this would apply mainly to longer fasts and not the kind of one-day fasts you’ve been practising.
      I can imagine that over the long term, your weekly one-day fasts might also increase the proportion of HDL (the “good” kind of cholesterol) relative to LDL (the “bad” kind of cholesterol). If, as you say, your total cholesterol is going up, is it mostly due to HDL or LDL? I’m also a little confused as to exactly what you’ve been tested for: have you had your triglyceride levels measured too, or just your cholesterol?
      Tallis

      1. I get the full cholesterol test(lipid panel)once or twice a year. I also have home test kit( which is not as accurate) and usually do a test once a month. It seems like since I starting fasting once a week my levels have gone up. I was hoping they would improve.

        1. So you mean both LDL and HDL have gone up?

          1. markterrell197126502 Avatar
            markterrell197126502

            Yes, all went up, but the triglyceride levels went up significantly. Do you have a recommendation for reducing them? I was thinking a 3 day water fast once a month.
            I really enjoy your site… a lot of great info. Thanks!

            1. Hmm… If there aren’t any other variables in the equation – like a changed diet or increased stress levels in your life – then I don’t know what to say! I think your idea of a three-day fast once a month makes sense, so long as emotionally you feel comfortable about living without food for a longer duration (compared to your one-day fasts).
              Glad you enjoy the site 🙂

  11. Hi. So glad I stumbled upon this. Finishing my first 36 hour fast tomorrow morning. Feeling pretty good right now. Never really felt hungry even though I have been overindulging and trying to get back on track. Question: is it important to take a multi-vitamin on a fast day? Is it okay for your body to be without potassium? Should I take a multi-vitamin and if so, when during the fast, if at all?

    1. Hi Trisha,
      Congratulations on your first 36-hour fast!
      Glad you’ve felt so good 🙂
      There’s absolutely no need to take multivitamin tablets while fasting, and especially so during a 36-hour fast. You’re not going to run out of potassium, even if you try a much longer fast 🙂 The only reason to take multivitamin tablets during longer fasts would be to continue compensating for a chronic lack of a particular nutrient.
      Hope this helps,
      Tallis

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