Extended healing fasts (14-40 days)

Why in the world would you ever want to fast for two weeks or more?

If only a tiny percentage of people in the Western world ever undertake a water fast of any kind, then only a tiny percentage of people who water-fast will ever undertake an extended healing fast of 14 days or more. Why? There’s simply no need. For everyday cleansing and healing, occasional 7-10 day fasts combined with regular short fasts such as the one-day (36-hour ) water fast should keep you in excellent health.

Benefits of extended water fasts (14-40 days):

However, in order to reach the deepest possible level of healing and reap the greatest benefits, it is necessary to dig deeper with a longer fast. For instance, certain serious physical illnesses – those often deemed incurable by Western medicine – require the cleansing of an extended fast in order to permanently heal. Despite what allopathic doctors may tell you, conditions as wide and varied as Type II diabetes, multiple sclerosis, chronic high blood pressure, autoimmune disorders, as well as certain types of tumors are all potentially curable. Yes, these illnesses and many more can be healed permanently through water fasting. As a water fasting coach, I’m privileged to witness this miraculous healing potential of the human body!

Beyond physical healing, the deepest spiritual cleansing can similarly take place only through the sheer length of an extended fast. Although nowadays we tend to remember only the Biblical 40-day fasts of Moses and Jesus, the fact is that many spiritual traditions over the millennia have demanded 40-day water fasts. Even Pythagorus required potential students to undertake a 40-day fast before he was willing to accept them. As much as we balk at the idea of giving up food for such a long time, it’s mostly just a question of unwillingness to forgo the addictions and pleasures of life. Don’t believe the voice of your fears and reluctant ego. You won’t starve to death. Unless you’re seriously malnourished and underweight to begin with, you carry the better part of 100,000 calories on you, locked in your fat tissue and waiting to be released through ketosis. That’s enough to last you well over 40 days. If you’re overweight, you could potentially fast for much longer (although in most cases this is not advisable).

Experiencing a healing crisis:

Although in one respect an extended fast simply continues the notion of a 7-10 day water fast, it is also much more powerful because it gives you the opportunity to experience deeper ‘healing crises‘. As described in the article on the 7-10 day water fast, a healing crisis often occurs towards the end of the first week of water fasting, as the symptoms of old illnesses, injuries and traumas resurface, before being permanently expelled from your body. A similar process often occurs around the end of the second week of fasting – and this is the reason that if you decide to extend a 7-10 day water fast, it’s worth aiming for at least 14 days. This second healing crisis tends to call forth deeper issues than the first healing crisis, or, alternatively, finishes resolving those issues which were not fully cleared during the first healing crisis. In other words, it’s from the beginning of the second week of water fasting that your body can begin to heal from more serious health issues. Simply, up until this point, your body has been cleansing the toxins of everyday life (and especially so if you haven’t been fasting regularly).

For the deepest and most serious health issues, whether physical or spiritual, healing crises often occur much later into the fast, whether 20, 30 or even 40 days. There’s no way to accurately predict when they will occur. You can only trust your body and let nature take its course…

Occasionally, healing crises can be extremely intense, especially when they occur late into a fast. When this happens, it’s critically important to be able to (continues below) tell the difference between a healing crisis and a sign from your body urging you to stop the fast. This is where working with an experienced water fasting coach can really help. If it’s a healing crisis, you should ideally try and push through. If it’s not, you should stop immediately!

Check out the webshop on waterfasting.org

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

Not every healing is accompanied by a dramatic healing crisis. Sometimes symptoms of illness and trauma simply begin to disappear. In cases like this – when no clear sign indicates that you’ve obviously freed yourself from a health issue – it can be difficult to know when to end the fast. This is another reason why it’s advisable to consider conducting any extended fast under some kind of supervision: from (1) a fasting coach like myself and, ideally, also from (2) a medical doctor who understands water fasting. The other main reason for working with a professional is to make sure you don’t overstep your body’s nutritional capabilities, as a prolonged fast begins to reach its physical limits.

The dangers of fasting too long:

If you continue fasting indefinitely there comes a point where the fast turns into starvation. You obviously don’t want to overstep this mark! For when your fat stores are finally depleted, the body has no choice other than to devour muscle tissue, as well as feed from your inner organs. You’ll do yourself serious damage. Fortunately, though, the body sends a clear sign: extreme hunger. Although it’s unlikely you’ll miss this red flag, two other less obvious scenarios also demand the end of a fast – and it’s here, again, that fasting under supervision can help. The first possibility is that you run out of muscle tissue before you deplete your fat stores. In order to power your body as a whole, it’s true that ketosis is extremely efficient. The problem is that the brain demands another fuel entirely: glucose. And this cannot easily be metabolised from fat tissue. Instead, the body must extract it out of muscle. The second possibility is that you deplete your electrolytes (blood salts). Although unlikely, it’s extremely dangerous! For this reason it’s advisable to have your blood tested at relatively regular intervals after the first 7-10 days of fasting.


After you break an extended fast, it’s extremely important to follow a well structured meal plan.

If you return too quickly to a normal diet, you risk encountering both digestive problems as well as ‘refeeding syndrome‘. This is a potentially fatal complication caused by the change from ketosis back to your everyday metabolism. After an extended fast, the body cannot be rushed in this process.

If you have any doubts, I offer a downloadable 67-page PDF which covers refeeding for any length of fast.

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230 responses to “Extended healing fasts (14-40 days)”

  1. I have done several 3 to 7 day fasts and was in the process of a 14 day water fast. However, I had a healing crisis so severe (I have extensive lower back pain from 4 different major car accidents, never my fault). I was at a point that I couldn’t even get dressed in the morning because of back pain. My crisis began on day 5 and continued through day 7. It was so bad, I couldn’t sit or lay down, so I was working on my third night of no sleep. I finally had to stop, which resulted in immediate relief. I was crushed not begin able to push through it, because the next day I was able to get dressed with minimal pain and go for a walk with no problems. I am probably 80% better and I know if I had continued, I would have experienced 100% relief. I have been off for 24 hours and am wondering if I can jump back into my fast and finish my 14 days (I realize it’s not the same as an unbroken 14 day fast) but I am hoping it is soon enough that maybe my healing crisis will continue and I will be able to push through. Although I know my body may move onto another crisis. Any advice would be welcome about restarting (I am going to try unless I hear otherwise). Thanks.

    1. Tallis Barker, D.Phil. Avatar
      Tallis Barker, D.Phil.

      Hi Tomirae,
      Thanks for sharing. Glad to hear you were planning on continuing your fast. This would definitely have been possible after ‘only’ 7 days, and it would also have facilitated a continuation (if not 100%) of the previous healing. I do suspect that it was going to take more than just another day or two to reach a full and permanent healing of the pain caused by your injuries. In my experience, serious muskuloskeletal injuries usually require several weeks of fasting at the very least – if not over a series of extended fasts – in order to reach completion. Wherever you end up on your current journey, know that you can continue it in the future too!
      All the best,

  2. Hi Tallis,
    Last time I have done a 12 days water fasting my period stopped for six months. I saw above you replied about missing period for a week that isn’t an issue but what do you think about missing period for six months? Is that normal?

    1. Tallis Barker, D.Phil. Avatar
      Tallis Barker, D.Phil.

      Hi Yukino,
      Thanks for writing. Sorry to hear you’ve been having issues with your cycle. The short answer to your question is: no, it’s not normal to miss your period for six months after a fast. The natural, underlying impact of a fast on the menstrual cycle is always towards balance and recalibration around a healthy zero point. The fact that your fast has actually led in the opposite direction shows that other forces are also coming into play. It’s impossible to guess at what these forces actually are without a full consultation, during which we’d look at the bigger picture of your life, the stressors impacting on your life, other health issues (and in your case I suspect there definitely are other health issues, even if apparently innocuous), and also diet. It’s like putting together pieces in a jigsaw puzzle, in order to see the full picture – at which point it becomes possible to devise a tailor-made fasting protocol.
      Hope this helps,

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