40-Day Water Fast: Comprehensive Guide & Personal Journal

Recently I completed a 40-day pure water fast. It had been one of my goals for many years now, and yet I never seemed to have the time to set aside 40 days. Like everyone, I am very busy and just could not fathom cutting myself off from the world for so long. In the last few years, I’ve done a 3-day water fast and a 10-day water fast and I had very good results, feeling clearer in the mind and spirit and more balanced and peaceful after each fast. This year I planned to do another 10-day water fast and possibly 14 days depending on how I felt. When I saw the results on Day 8 which I will explain below, I decided that I had to continue no matter what. And that’s what led me to do 40 days.

Water fasting means to drink only water, in the same way that juice fasting means to drink only fresh juice. Only water is consumed during the fast and no food. Natural Hygienists agree that having small amounts of fresh lemon or lime in the water is ok; however in this water fast, I did not do that.

One week after the fast, enjoying fresh, delicious food!

Water fasting is not for the weak-minded. It takes a lot of mental strength, trust and faith to live on only water for an extended period of time. If one has prepared for the fast well and has a full reserve of minerals and vitamins, this type of detox is totally safe. It is important to prepare the body well in advance, cleaning the colon with some intestinal cleansing and then moving gently into pure water by drinking only juices for a number of days.

If someone is extremely toxic from a typical Standard American Diet and they have never done any type of detox before, then they are NOT a safe candidate for water fasting. They would need to do a lot of gentle cleansing first, build up their mineral and vitamin reserve and ensure an alkaline pH at the very least.

Water fasting is certainly not a new concept or some type of ‘fad’ diet. Almost all the great spiritual leaders including Jesus, Buddha, Mohammed and Gandhi practiced fasting.

This is the only type of cleanse where the body is not getting any food at all. For that reason, it can go deeper and is more powerful for healing.

I believe that a water cleanse is the best way to release toxins from the mind, body and spirit. It’s that simple. The body knows how to heal itself, it just needs a chance to do it. When you fast, you are directing the body to takes it’s energy inward. It can then start cleansing and healing itself.

40-Day Water Fast – The How & Why of this Pure Detox on Day 40

There are many different cleansing reactions that can occur during a water fast as the body releases toxins into the blood. Based on my experience, I recommend a daily water enema during the cleanse to help the body minimize cleansing reactions. Dry skin brushing also helps. It’s good to be in an environment where the body can have some exposure to sunlight and fresh air every day. Being close to nature is best.

An example of how you don’t want to feel from breaking a fast incorrectly…

In addition to taking care during the fast, having a plan for breaking the fast is absolutely essential. So many people make the mistake of bingeing on comfort foods after a long fast, and in the case of drinking only water, this can actually be dangerous. It is very important to gently ease back into solids foods and only 100% raw juices and foods to allow the organs to ‘wake up’ gently. In my eBook, I discuss in detail how to break a water fast safely.

As the saying goes, ‘Any fool can fast, but only a wise man can break it properly.’

My new book, A Comprehensive Guide to Water Fasting, is a complete guide detailing every aspect of water fasting. This book is currently for sale in ebook format and is immediately downloadable in either .pdf or .epub format. (To view this ebook on your iPhone or iPad, simply choose the .epub version and install the free iBook app on your device before downloading your ebook file.)

Just some of the topics covered include:

  • What is Water Fasting
  • Benefits of Water Fasting
  • Water Fasting vs. Starvation
  • How Long to Fast
  • Hunger
  • Preparation for a Water Fast
  • Pre-fast Cleansing
  • Finding the Right Location
  • Preparing the Body Nutritionally
  • Water – What Kind, How Much
  • Enemas
  • Warnings when Water Fasting
  • Emotional Cleansing Reactions
  • Weight Loss – What to Expect
  • How to Break a Water Fast
  • Information on Parasites
  • Follow-Up Cleansing
  • Affirmations
  • Energy Devices to Energize the Water

Water Fasting by Jennifer Thompson

In addition to that, I documented my 40-day experience and the entire journal is included in the book. The big surprise for me came on Day 8 of my cleanse. I saw an ascaris intestinal roundworm (parasite) released in my enema and it was a huge wake-up call that I had a possible worm infestation. Looking back, this actually made sense because I had been experiencing a lot of strange symptoms in the last 4 years, all of which is explained in the book. When I saw this worm on Day 8, I just knew I had to continue. And the amazing thing is, that they just kept on coming! I had worms and worms, all roundworms, released almost daily during the entire fast. There was no choice but to keep going!

I learned many things about the ascaris round worm during my fast, including the symptoms of having intestinal round worms, which can include:

      – Fever


      – Nausea


      – Gas & Bloating


      – Abdominal Pain


      – Digestive Problems


      – Weakness/Fatigue


      – Allergic Reactions to Food


      – Crawling Sensation Under the Skin


      – Eczema


      – Chronic Cough


      – Weight Gain


      – Inability to Gain or Lose Weight


      – Anemia


      – Numbness of the Hands and/or Feet


              – Fast Heartbeat

Can you imagine how having so many parasites could affect your overall health and well-being? Even I was surprised and amazed to see the results, something I was never able to achieve with juice fasting, colon cleansing or parasite programs alone.

It is likely that countless individuals are suffering from ascaris round worms, other parasites and/or candida in their bodies and that their symptoms are being misdiagnosed as other medical conditions instead.

The book also includes a detailed section on follow-up cleansing and nutritional support to keep the body clean and free of parasites after a long fast or detox program.

My experience was so powerful that my neighbor became inspired, and she started a water fast too, about 18 days after I started. Throughout the book, I also detail her experience. In the end, it was great to have someone to share my stories with daily and certainly, we both benefited from the mutual support.

Breaking a 40 Day Water Fast – Eating on Day 41

Of course, in only drinking water for 40 days, I lost a lot of weight. In total, my weight loss was about 15 kg or 33 pounds. During the first 2 weeks, I lost most of the weight; after that, my weight seemed to stabilize and that was quite comforting actually, because my goal was to heal myself, not to waste away!

After the fast, I gained 5kg back rather quickly and I was very happy because I had really gotten too thin. Since then, my weight has remained stable. I crave less food in general and less high-sugar content fruits. For certain, with over 21 feet (6.6 meters) of worms out of my body, my metabolism has changed for the better and I am happy to say that my food is now only feeding me! Yes, 21 feet!!! It is an amazing story of healing.

The path to good health is so simple – trust that the body knows. Feed it well, think positive thoughts, bring love into your heart, and cleanse and detoxify your body and you will begin to feel superior states of consciousness and well-being that you never even knew existed!

Disclaimer: The information provided on this site is for informational purposes only and is not intended as a substitute for advice from your physician or other health care professional or any information contained on or in any product label or packaging. You should not use the information on this site for diagnosis or treatment of any health problem or for prescription of any medication or other treatment. You should consult with a healthcare professional before starting any diet, exercise or supplementation program, before taking any medication, or if you have or suspect you might have a health problem. You should not stop taking any medication without first consulting your physician. Read full disclaimer here.

New and improved edition! This eBook is now available with the parasite photos or without parasite photos, with the same text in each version.



Water Fasting eBook: A Comprehensive Guide & 40-Day Personal Journal (.pdf)



eBook: Water Fasting (No Worm Photos) – A Comprehensive Guide & 40-Day Personal Journal (.pdf)



Water Fasting eBook: A Comprehensive Guide & 40-Day Personal Journal (.epub)



eBook: Water Fasting (No Worm Photos) – A Comprehensive Guide & 40-Day Personal Journal (.epub)


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Jennifer Thompson has been working with raw food, juices, smoothies and detox for over two decades to help people heal. Today, she shares her expertise worldwide, offering lectures, workshops, training and one-on-one consultations at various health and detox retreat centers. She provides Iridology Readings & Health Coaching via Skype and Phone to clients and continues to educate, motivate and inspire others on their journey of healing. When she’s not working, you’ll find her hiking in the mountains, power-walking along the sea or globe-trotting to a new and exotic health destination.
109 replies
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    • Jennifer Thompson
      Jennifer Thompson says:

      Hi Amy,

      Once you complete a 40-day water fast, you will see that it would be impossible to do several times a year! Think of a 40-day water fast like climbing Mt. Everest. It’s a life-changing experience and a HUGE physical and spiritual challenge.

      How many long and how often really depends on the individual – what are you goals and what is your current state of health? There are many types of detoxes which do not require total water fasting that are also very effective for healing.

      To your health,


  1. zoi
    zoi says:

    hello jennifer
    my name is zoi and i come from greece
    I am planning to buy your ebook about water fasting
    and i would like to ask you 2 questions
    with the help of your book will I be able to do a long 21 day water fast as I will be informed(from the book ) what to expect and not to worry?
    and what about daily enemas? am not a big fan….
    can i replace them with epsom salts or sea salt instead?
    thank you in advance
    Iam waiting for your reply in order to make the order

  2. Sharon Bendixen
    Sharon Bendixen says:

    Hi Jennifer. I am 61 years old this month and am doing my first real water fast in my life. I have been healthy eater for about 3 years in that I have done 2 week grape fasts when the delicious grape season comes around. I have also done a 40 day juice fast which went very well. My eating for about 32 years has been fruit smoothies or quinoa porridge and fruit in winter for breakfast.Normally salad with salmon or beans and organic basmati rice with avocado and tomatoes. I don’t want to go on and on but I wanted to give you some idea about me before I ask you this question.
    I was initially only going to do this water fast for 7 days, but I am quite motivated to extend it as I go.
    i have had some close ones say to me ” not are your age” I do pilates as a way of life. I weigh and have done 60 kilograms. could you advise me? I have searched on google extensively and many young women have done even 40 day fasts successfully. What is this ‘ At your age you should not be doing something like this’ I have fared rather well so far on day 6 of my water fasts and not even had some of the severe symptoms yet of nausea etc. I am just weakened at times but then also experience energy at time. I am drinking water actually sipping water throughout my day.

    Thank you for your consideration

    • Nadine
      Nadine says:

      Hi, Sharon. Just to let you know, I will be 61 the beginning of May and just completed a 30-day water fast. From there, I’ve added the water (only) of 2 fresh young Thai coconuts a day and have continued so far for an additional 16 days. Feeling and looking great. I have a lot of fasting and juicing experience, and feel in tune enough with my body’s signals to proceed safely. Hope this bit of info is of benefit to you! All Love, Nadine

  3. Mike
    Mike says:

    Hello! I just read a little bit of your story on your water fast. Amazing!!!! I’ll be doing the same thing, only I’ll be doing a juice fast with raw foods. I’m embarrassed to say that I acquired hsv2 and I do believe that the body can heal from this horrible disease. As for my juice fast, will this be just as effective as a water fast? After all, I’ll be blending the veggies with clean water. There are also certain things I’ll be taking for the disease such as oregano oil and bentonite clay. What are your thoughts about fasting with blended raw foods (juicing) and taking natural supplements like the oil and clay? Your opinion would be very much appreciated. Thank you

    • Jennifer Thompson
      Jennifer Thompson says:

      Hi Mike,

      Great news that you will be starting a juice and raw food cleanse – that’s awesome! I think the juice and/or smoothie fast is a great place to start. After all, you have to learn how to walk before you can run. See how you feel and how your body responds. You have plenty of time to try other types of detox later.

      For the oregano oil, in my experience it is not the most effective choice for hsv2. I usually recommend something like Grapefruit Seed Extract (GSE) with a combination of other herbs. The bentonite clay is not normally needed for a basic raw food cleanse. You only need that if you start taking more rigorous colon cleansing herbs and should never take bentonite with other supplements or herbs because the clay will absorb them. In short, ditch the bentonite and oregano oil and focus on the cleanse for now. Getting alkaline is a very important step for you. (As a side note, the bentonite clay makes for a great face mask so you can always use it for that!)

      Blessings and good luck!

      To your health,


  4. t
    t says:

    Great. Love hearing about worms. I think I have worms and am planning on fasting.
    Did you experience any sinus symptoms?
    How is your clogged ear doing now?

    • Jennifer Thompson
      Jennifer Thompson says:

      Hi T,

      I didn’t have any sinus symptoms that I can recall. No clogged ear anymore. I did follow-up parasite cleansing every 3 months for 2 years. Then I did a 25-day water fast and I had no worms during that fast at all, so I happily declared myself worm-free :)

      To your health,


  5. Tola
    Tola says:

    Hello ma’am,I’m a 20 year old college student and I have tried to fast but often I break the fast not cause I’m tired but I just give into the temptation of eating,please what can I do to stop breaking the fast before time although I have done a water fast for 3days before!..

    • Jennifer Thompson
      Jennifer Thompson says:

      Greetings Tola,

      What preparations are you doing for your body and spirit before your fast? In other words, do you do a pre-cleanse? In my book I explain the importance of doing a pre-cleanse and how to do it too. The pre-cleanse is the most important step and the one the people tend to skip the most.

      To your health,


  6. krashena walker
    krashena walker says:

    Hi Jennifer. I am 28 yrs old and my weight is about 240lbs. I dont eat much. I eat maybe 1x a day. And I’ve been looking into the water fasting for a couple months now. Now I’m ready to take dive, do you have any tips?

    • Jennifer Thompson
      Jennifer Thompson says:

      Hi Krashena,

      Fasting will not boost your metabolism so I would say this might not be the best solution to your goal of losing weight for the long-term. Do you currently exercise at all? And what type of food do you eat? Eating too much at one time can be hard on the liver and metabolism as well… so it really does depend on a few factors as you can see! I would honestly recommend an Iridology consultation first; from there I can determine the best detox plan for you!

      To your health,


  7. RSam
    RSam says:

    hey jen,

    I’ve been wanting to do an extended water fast many years ago, I’m 20 now. do you think it’d be a good idea to start it during the holidays? I suppose I can sleep thru my hunger pangs or cravings. I tried doing this MANY times when I’m going to school but often hunger pangs/cravings kick in. Another thing is would it be alright to drink green tea (unsweetened)? since water sounds too bland.

    • Jennifer Thompson
      Jennifer Thompson says:

      Hi RSam,

      Organic herbals teas and either lemon in water or raw apple cider vinegar in water would potentially be a good idea to help get through any hunger pains. Make sure the teas do not contain any artificial flavorings. Green tea is not necessarily recommended in large quantities because of the caffeine. One or two cups per day would probably be ok. Of course, you should always consult with a medical doctor and ask their professional opinion before making any changes to your diet. Good luck!

      To your health,


  8. Kara
    Kara says:

    im wondering.. If there is ways to prepare for a fast during pregnancy- obviously for after birth? If a parasite is suspected should I avoid breastfeeding? How can I rid family members of parasites- obviously children can’t fast, anything I can do??

  9. Jimi
    Jimi says:

    Great article,

    Just a question about mental alertness. I’m a college student and am ok with fasts 3 to 5 days but want to try 7+. I need to be focussed to keep up at school and during vacation I do quite physical work. Do I risk not being able to learn effectively?



    • Jennifer Thompson
      Jennifer Thompson says:

      Hi Jimi,

      It’s not recommended to do any physical work or even intense mental work while fasting. A green smoothie cleanse work be perfect for you as an alternative. I have a great program plus all the recipes for a 3-day green smoothie detox in my book: Green Smoothies for Dummies. You can repeat it 2-3x to make a 6-9 day cleanse.

      Be well!

      To your health,


  10. Elizabeth
    Elizabeth says:

    How can one do a water fast when one has hypoglycemia and blacks-out and has a rapid heart beat when sugar levels get too low?

    • Jennifer Thompson
      Jennifer Thompson says:

      Hi Elizabeth,

      Someone like that is NOT a candidate for water fasting and they should consult their medical doctor before any change of diet. There are many ways to regulate blood sugars and get minerals levels up naturally with diet; also a more gentle type of detox program with green juices, supplements & smoothies can be created to best optimize results. Thank you!

      To your health,


  11. Michael G
    Michael G says:

    Hi Jennifer, I agree with your recommendations on periodic fasting and eating as much raw, preferably organic, foods in the diet as possible. The longest I’ve fasted on pure water is 7 days and the hardest part is dealing with weakness and the mind craving for food like it’s a drug. Fasting is like weight lifting for our will power. Also, the force of gravity makes me want to constantly lay down. The last time I water fasted I only made it 4 days and I sneezed while turning my head and covering my mouth and I threw my back out, so I broke the fast to add support to my core again. Next time I’ll pinch my nose to prevent sneezing if I’m fasting! I want to mention something I discovered recently and have been taking about 2 Tblsp a day now for about 10 days. Food Grade Diatomaceous Earth may just be the most amazing thing I’ve ever discovered and I can’t believe I never read about it in all my decades of learning about health and nutrition. I really like what I’m feeling since taking it and I highly recommend it to everyone who can eat solid foods. It’s probably the number one best thing for getting rid of parasites in the body and that’s why I mentioned it here. I’m looking forward to doing another 7 day water fast soon. Aloha!

    • Jennifer Thompson
      Jennifer Thompson says:

      Hi Michael,

      Thanks for sharing your story of fasting – it’s wonderful to hear that you had a positive experience!

      Re: Diatomaceous Earth I have to say that I strongly advise AGAINST using this product as it is known to contain high levels of ARSENIC and can do way more harm than good. Definitely does NOT go with detox in any way whatsoever.

      Wishing you all the best in health!



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