Intermittent fasting

Intermittent fasting
for beginners

Intermittent fasting is the ancient secret of health. It is ancient because it has been practiced throughout all of human history. It’s a secret because this powerful habit has been virtually forgotten.

But now many people are re-discovering this dietary intervention. It can carry huge benefits if it is done right: weight loss, increased energy, reversal of type 2 diabetes and many other things. Plus, you’ll save time and money.

In this beginner’s guide you can learn everything you need to know about intermittent fasting.


  1. Learn more

Introduction – a natural part of life

Intermittent fasting – isn’t that starvation?

No. Fasting differs from starvation in one crucial way. Control. Starvation is the involuntary absence of food. It is neither deliberate nor controlled. Fasting, on the other hand, is the voluntary withholding of food for spiritual, health, or other reasons.

Food is easily available, but you choose not to eat it. This can be for any period of time, from a few hours up to days or even weeks on end. You may begin a fast at any time of your choosing, and you may end a fast at will, too. You can start or stop a fast for any reason or no reason at all.

Fasting has no standard duration, as it is merely the absence of eating. Anytime that you are not eating, you are fasting. For example, you may fast between dinner and breakfast the next day, a period of approximately 12-14 hours. In that sense, fasting should be considered a part of everyday life.

Consider the term “break fast”. This refers to the meal that breaks your fast – which is done daily. Rather than being some sort of cruel and unusual punishment, the English language implicitly acknowledges that fasting should be performed daily, even if only for a short duration.

Fasting is not something queer and curious, but a part of everyday, normal life. It is perhaps the oldest and most powerful dietary intervention imaginable. Yet somehow we have forgotten its awesome power and ignored its therapeutic potential.

Learning how to fast properly gives us the option of using it or not.

To get started, either watch our brief video course on fasting, or keep reading below.

325,856 viewsDo you want to keep watching? Part 2: How to maximize fat burning




How does intermittent fasting work?

Balancing eating and fasting

At its very core, fasting simply allows the body to burn off excess body fat. It is important to realize that this is normal and humans have evolved to fast without detrimental health consequences. Body fat is merely food energy that has been stored away. If you don’t eat, your body will simply “eat” its own fat for energy.

Life is about balance. The good and the bad. The yin and the yang. The same applies to eating and fasting. Fasting, after all, is simply the flip side of eating. If you are not eating, you are fasting. Here’s how it works:

When we eat, more food energy is ingested than can immediately be used. Some of this energy must be stored away for later use. Insulin is the key hormone involved in the storage of food energy.

Insulin rises when we eat, helping to store the excess energy in two separate ways. Sugars can be linked into long chains, called glycogen and then stored in the liver. There is, however, limited storage space; and once that is reached, the liver starts to turn the excess glucose into fat. This process is called De-Novo Lipogenesis (meaning literally Making Fat from New).

Some of this newly created fat is stored in the liver, but most of it is exported to other fat deposits in the body. While this is a more complicated process, there is no limit to the amount of fat that can be created. So, two complementary food energy storage systems exist in our bodies. One is easily accessible but with limited storage space (glycogen), and the other is more difficult to access but has unlimited storage space (body fat).

The process goes in reverse when we do not eat (fasting). Insulin levels fall, signaling the body to start burning stored energy as no more is coming through food. Blood glucose falls, so the body must now pull glucose out of storage to burn for energy.

Glycogen is the most easily accessible energy source. It is broken down into glucose molecules to provide energy for the other cells. This can provide enough energy to power the body for 24-36 hours. After that, the body will start breaking down fat for energy.

So, that the body only really exists in two states – the fed (insulin high) state and the fasted (insulin low) state. Either we are storing food energy, or we are burning it. It’s one or the other. If eating and fasting are balanced, then there is no net weight gain.

If we start eating the minute we roll out of bed, and do not stop until we go to sleep, we spend almost all our time in the fed state. Over time, we will gain weight. We have not allowed our body any time to burn food energy.

To restore balance or to lose weight, we simply need to increase the amount of time we burn food energy (fasting). In essence, fasting allows the body to use its stored energy. After all, that’s what it is there for. The important thing to understand is that there is nothing wrong with that. That is how our bodies are designed. That’s what dogs, cat, lions and bears do. That’s what humans do.

If you are constantly eating, as is often recommended, then your body will simply use the incoming food energy and never burn the body fat. You’ll only store it. Your body will save it for a time when there is nothing to eat. You lack balance. You lack fasting.

Learn more

Time-restricted eating – a detailed intermittent fasting guide

How fasting affects your physiology and hormones


Is Obesity Caused by Too Much Insulin? – Interview with Dr. Ted Naiman


Benefits of intermittent fasting

Fasting’s most obvious benefit is weight loss. However, there are a myriad of benefits beyond this, many of which were widely known in ancient times.

The fasting periods were often called ‘cleanses’, ‘detoxifications’, or ‘purifications’, but the idea is the same – to abstain from eating food for a certain period of time for health reasons. People imagined that this period of abstinence from food would clear their bodies’ systems of toxins and rejuvenate them. They were more correct than they knew.

Some of the purported physical benefits of fasting include:


Fasting offers many important unique advantages that are not available in typical diets.

Where diets complicate life, fasting simplifies. Where diets are expensive, fasting is free. Where diets can take time, fasting saves time. Where diets are limited, fasting is available anywhere. Where diets have variable efficacy, fasting has unquestioned efficacy. There is no more powerful method for lowering insulin and decreasing body weight.

Here are even more reasons to try it, along with more details: The 7 practical benefits of fasting

Success stories

  • Keto and intermittent fasting: "I am completely blown away by the changes"
  • Intermittent fasting: down 42 pounds in 14 months
  • How Gino reversed his type 2 diabetes by doing the opposite


Different ways to fast

Shorter fasts (<24hrs)

Fasting offers infinite flexibility. You can fast for as long or short as you like, but here are some popular regimens. Generally, shorter fasts are done more frequently.


This involves daily fasting for 16 hours. Sometimes this is also referred to as an 8-hour eating ‘window’. You eat all your meals within an 8-hour time period and fast for the remaining 16 hours. Generally, this is done daily or almost daily.

For example, you may eat all your meals within the time period of 11:00 am and 7:00 pm. Generally, this means skipping breakfast. You generally eat two or three meals within this 8-hour period.


This involves a 4-hour eating window and a 20-hour fast. For example, you might eat between 2:00 pm and 6:00 pm every day and fast for the other 20 hours. Generally, this would involve eating either one meal or two smaller meals within this period.

Learn more about shorter fasts


Longer fasts (>24 hours)

24-hour fasts

This involves fasting from dinner to dinner (or lunch to lunch). If you eat dinner on day 1, you would skip the next day’s breakfast and lunch and eat dinner again on day 2. This means that you are still eating daily, but only once during that day. This would generally be done two to three times per week.

5:2 fast

Dr. Michael Mosley popularized this variation in his book ‘The Fast Diet’. This involves 5 regular eating days and 2 fasting days. However, on these two fasting days, it is permitted to eat 500 calories on each day. These calories can be consumed at any time during the day – either spread throughout the day, or as a single meal.

36-hour fasts

This involves fasting for the entire day. For example, if you eat dinner on day 1, you would fast for all of day 2 and not eat again until breakfast on day 3. This is generally 36 hours of fasting. This provides more powerful weight loss benefit. The other great benefit is that it avoids the temptation to overeat dinner on day 2.

Extended fasting

You can fast almost indefinitely. Generally for fasts greater than 48 hours, I recommend a general multivitamin to avoid micronutrient deficiency. The world record for fasting is 382 days, so going 7-14 days is certainly possible.

I discourage people from fasting for more than 14 days due to high risk of re-feeding syndrome.

Learn more about longer fasts



Common questions and answers about fasting

Questions and Answers About Fasting

Who should NOT fast?

You should not fast if you are:

  • Underweight (BMI < 18.5)
  • Pregnant – you need extra nutrients for your child.
  • Breastfeeding – you need extra nutrients for your child.
  • A child under 18 – you need extra nutrients to grow.

You can fast, but may need supervision, under these conditions:

  • If you have diabetes mellitus – type 1 or type 2.
  • If you take prescription medication.
  • If you have gout or high uric acid.

Won’t fasting put me into starvation mode?

No. This is the most common myth about fasting. In fact, the truth is just the opposite. Studies conclusively show that fasting increases basal metabolic rate. Learn more

Can I exercise during fasting?

Yes. You should continue all your usual activities, including exercise, while fasting. You do not need food to provide energy for exercise. During this time, your system will burn body fat for energy. Excellent! Learn more

What are the possible side effects?

There can be a number of possible nuisance side effects. Here’s what to do if you encounter them:

  • Constipation is common. Less going in means less going out. You don’t need medications unless you experience discomfort. Standard laxatives can be used to help.
  • Headaches are common and tend to disappear after the first few times on fasts. Taking some extra salt often helps mitigate such headaches.
  • Mineral water may help if your stomach tends to gurgle.
  • Other possible side effects include dizziness, heartburn and muscle cramps. Learn more

A more serious side effect is the refeeding syndrome. Fortunately, this is rare and generally only happens with extended fasts (5-10 days or more) when one is undernourished. Learn more

Why does my blood sugar go up during fasting?

This is due to hormonal changes that occur during fasting. Your body is producing sugar in order to provide energy for your system. This is a variation of the Dawn Phenomenon. Learn more

How do I manage hunger?

The most important thing to realize is that hunger passes like a wave. Most people worry that hunger will continue to build until it is intolerable, but this does not happen. Instead, hunger comes in a wave. If you simply ignore it and drink a cup of tea or coffee, it will often pass.

During extended fasts, hunger will often increase into the second day. After that, it gradually recedes; and many people report a complete loss of hunger sensation by day 3-4. Your body is now being powered by fat. In essence, your body is ‘eating’ its own fat for breakfast, lunch and dinner and therefore is no longer hungry. Learn more

Won’t fasting burn muscle?

No. During fasting, the body first breaks down glycogen into glucose for energy. After that, the body increases fat breakdown to provide energy. Excess amino acids (the building blocks of proteins) are also used for energy, but the body does not burn its own muscle for fuel.

It would be a long stretch of the imagination to think that our bodies store energy so carefully in the form of glycogen and fat only to burn muscle when it is needed.

Fasting has been practiced for thousands of years without difficulty. In my experience with over 1,000 patients on various fasting regimens, exactly zero have complained that they have noticed significant muscle loss. Learn more

What are your top tips for intermittent fasting?

Here are the nine top tips, briefly:

  • Drink water
  • Stay busy
  • Drink coffee or tea
  • Ride out the hunger waves
  • Don’t tell anybody who is not supportive that you are fasting
  • Give yourself one month
  • Follow a low-carb diet between fasting periods. This reduces hunger and makes fasting much easier. It may also increase the effect on weight loss and type 2 diabetes reversal, etc.
  • Don’t binge after fasting

Learn more practical fasting tips

How do I break a fast?

Gently. The longer the fast, the more gentle you must be. For short duration fasts, eating too large a meal after fasting (a mistake that we have ALL done, myself included) will usually give you a stomach ache. While this is not serious, people learn quickly to eat as normally as possible after a fast.

Isn’t it important to have breakfast every morning?

No, it’s not. This is an old misconception based on speculation and statistics, and it does not hold up when it’s tested. Skipping your morning meal just gives your body more time to burn fat for energy. Since hunger is lowest in the morning, it is often easiest to skip it and break your fast later in the day. Learn more:

Can women fast?

Absolutely. The only exception is women who are underweight, pregnant or breastfeeding. Other than that, there is no reason not to fast. Women have problems during fasting, but so do men. Sometimes women do not get the results they want, but that happens to men, too.

Women have fasted for thousands of years without incident. Studies show that the average weight loss for women and men who fast is similar. Learn more about women and fasting

Isn’t fasting the same as reducing calories?

No. Not at all. Fasting reduces the time you spend eating and addresses the question of ‘when to eat’. Calorie reduction addresses the question of ‘what to eat’. They are separate issues and should not be confused with each other.

Fasting does reduce calories but it’s benefits extend far beyond that. Learn more

Will I lose weight?

Absolutely. It is almost inconceivable that you will not lose weight if you do not eat.

I call fasting ‘The Ancient Secret of Weight Loss’ because it is one of the most powerful dietary interventions for weight loss, yet it has been almost completely ignored it in recent years. Learn more

More Q&A

Many more questions and answers about intermittent fasting


How to get started

Now that you know all the essentials of fasting, how do you get started? You just follow these steps:

  • Decide what type of fast you want to do
  • Decide upon the length of time you want to fast
  • Start fasting. If you do not feel well, or if you have any concerns, then stop and seek help
  • Continue all your usual activities outside of eating. Stay busy and live normally. Imagine you’re “eating” a full meal of your own fat
  • Break the fast gently
  • Repeat

Yes. It really is THAT simple.

Extra video preparation

If you feel that you want more preparation first, then watch our intermittent fasting video course.

If you want to, you can jump straight to the get-started sections of the course:

  • The left one below is about how to do a 24-hour fast (it’s surprisingly simple).
  • The right one is a real challenge, a 7-day fast (are you up for it?).
How to Get Started with Fasting – Dr. Jason Fung
The Power of a 7–Day Fast – Dr. Jason Fung


Resources to learn more


The fasting video course






Q & A

Ask Dr. Jason Fung



Check out Dr. Fung’s books The Obesity Code and The Complete Guide to Fasting on Amazon.


Dr. Fung’s website:

About Dr. Fung

Who Is Dr. Jason Fung?


Low carb for beginners

How to lose weight

How to reverse type 2 diabetes


What are your experiences with fasting? Do you have questions that are not answered above? Please feel free to leave a comment below.

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  1. Paula
    Where is your clinic , please ?
  2. Nancy Or
    Hello I am from Hong Kong where fat-reducing supplements everywhere. I find your piece of advise very very good and hopefully I can get through the hungry period (wave) and reduce my BMI.
  3. Deborah
    I've been doing the IF for 4 weeks now. I follow a 23 hour IF and eat one keto friendly meal a day. I've done a 48 hour fast once, and one day I ate two keto friendly meals. One day, my anniversary, I had a meal out (keto) but did finish it with a crème brule - I felt entitled on my 46th anniversary! I have only lost 7 pounds! What can I possibly be doing wrong? I drink two large cups of coffee each morning with heavy cream and then water only for the rest of the day. I have only twice reached "moderate" ketosis.
    Replies: #170, #192
  4. Alexander F.
    Dr. Fung,

    Thanks for the great information out there. I am currently just past 37 hours in a fast and will probably break it in about an hour or so. That being said, I had an epiphany a couple of hours ago while lying in bed and planning my day. I was thinking about how great I felt and how I could easily continue until 48 hours or more.

    Anyways (on to the epiphany), it occurred to me that potentially more proof on the benefits of fasting could be displayed on how the body itself handles disease and sickness. In a lot of cases, there is a loss of appetite. I think that this could be the body's internal mechanism to force a fast and stimulate autophagy? I don't know if that sounds stupid or not, but I haven't heard or read anything on the topic. So maybe I am the first to suppose this.

    Could you please weigh in on this hypothesis?


  5. Sandra
    Hi Jay
    Brilliant reading this what do you think of coffee tea with cream and water in fasting is this ok
  6. Brigitte

    It's nice that serious scientists have been able to proof some of the claimed benefits of fasting, even if it is only in mice. Then it all ends on a downer: "The findings suggest that drug treatment could stimulate regeneration without requiring patients to fast, which is difficult for most people."
    So once again, suggest to people that a treatment free of charge and totally under their control is too difficult to do - but, hey guys, we will create an expensive drug we will sell to you, so you don't need to inconvinience yourselves.

    Such statements really pee me off!

  7. Ar
    Fasting as an Entrepreneur/Mentor and A spiritual Person has helped me focus on the gym, my work, and of course greater mental clarity! I FEEL GREAT, and the resources i am not eating can go to other people !
  8. oni
    It's curious how this content is SO similar to contents made by people with anorexia. I had nervous anorexia, it was so hard to get out of there with this kind of information/content/"advice" online. Fortunately, I did, I got rid of anorexia and studied nutrition, and I really can't believe people think that fasting during and entire day is a healthy thing.
    Reply: #188
  9. Jay
    Oni, your past struggles with anorexia is clouding your judgement. Intermittent fasting is perfectly healthy and has changed a lot people's lives (including mine) .

    Only thing I would say is that one meal per day didn't feel sustainable for me. Although some people find it easy and actually prefer it so it just depends. I've experimented with many different eating windows and I've found 18:6 is the sweet spot for me. (18 hours fasting, 6 hour eating window) - I will never diet ever again.

  10. Tomi
    I am still unsure about how many calories i should be eating. I'm 5 '1, 130 lbs and have some health issues. Can anyone advise?
  11. Kama
    Tomi, we don't have to count calories on this WOE!
  12. Jodi
    I have heard that you can have 2tbsp of cream with coffee and not break the fasting, is this true?

    I have also been hearing people talk about taking fish oil pills and coconut oil to get better results in weight loss, is this true?

  13. Debbie
    thanks for the great information... much appreciated. I am on a 2 day fast (which will end up being 66 hr fast (from 6pm monday to noon on Wed.). I am drinking lots of water (with fresh lemon and ginger root) and Greens+ superfood drink, but I am wondering if I also should take maybe 2- 3 teaspoons of essential fatty acids like Udo's Oil by Flora. I don't want to starve my brain, but if I eat fat, maybe I am defeating the whole purpose of the fast. Please advise.. Thanks so much
  14. Debbie
    that should have been 6pm Sunday, not Monday. (the start of my fast).
  15. Julie
    what can you eat on a fast day if for example you fast from 7pm to 10am can you have sugar free jelly and coffee with cream ?
  16. Caroline
    Morning - I did my first IF a few days ago using 18:6 - I do feel good and its helping me on week2 of HFLC diet - lost 8 pounds in the first week, hoping for another 2 this week.
  17. Robert
    Quick question
    Could a person eat once a day, if you met your nutrition targets?
    I can't find the information
    Thank you
  18. Robert
    Love your site Dr. Fung
  19. Laurie
    Good morning. I'm on my 3rd day of 16/8 fast. I actually feel great! I've even woke up the past two mornings at 4:30 am naturally - meaning, no alarm clock. So, I've gotten up and worked out. I thought it would be hard working out on an empty stomach but I've felt fine afterwards. I do have a question. What about taking morning vitamins? Is it OK to take them during a fast, or do you recommend waiting to take vitamins and allergy pill at lunch when I break my fast?
    Reply: #194
  20. Ken

    A lot of people are asking, can I have this or that during a fast?
    Personally I wonder, why complicate things. If you’re on a fast, it’s a fast. Drink plenty of water and have the odd black coffee.
    No cream, no butter, no oils etc.
    Let the fast do it’s job.

    I’ve been following a low carb diet for the last 11 weeks and 6:18 IF for the last 5. I’ve lost 8kgs (17.6lbs). Most of it lost since IF started.

    I’d still have the odd treat every now and then and a few beers at the weekend, For me IF is a lifestyle change rather than a phase. You just have to find what works for you.

    Hope this helps someone.

    Reply: #171
  21. Ken
    I forgot to add.
    For those of you who follow a keto diet. I wasn’t aiming to get into ketosis but there was times when I was. I notice this as I had a metallic taste in my mouth, so I’d use a ketone test strip to test. (I’d tried the keto diet in the past, but found it very hard to stick to).
    I wasn’t eating a high % of fats, just a low carb diet. I guess as I was fasting, my body fats were being processed.
  22. Louise Marie
    Good Morning, I started intermittent fasting (20:4) on the 28th of May 2018 weighing 100KGs. Today the 29th June 2018, I am at 95kgs. I have lost 5kgs. It is amazing doing intermittent fasting. My feelings of hunger have gone away. When I started I had slight headache from time to time, but as I drink lots of water, the headache is now history. Not heart burnt so far. With intermittent fasting, constipation has gone away, the thought of what will I eat for breakfast, lunch snacks and so on has gone away. I have realized that I have saved a lot of money just for one month of intermittent fasting because before I would buy this and that for snacks. I feel great inside and I believe that I will make it to my goal which is 70Kg by the end of December 2018.
  23. Arvindra Kanwal
    You recommend exercise with fasting. This is fine, but the muscular hypertrophy will need protein and carbs for recovery. This is possible in a 16:8 cycle but what happens on 36 hrs fasting when I do an intense workout on day 1? How will the body recovery? Where will the protein come from? Any external ingestion will lead to an insulin spike etc. Look forward to your advice on how to manage heavy cardio or high intensity weight training on diet days
  24. Julie
    i wish offered a place to track my intake.
  25. Angela
    Hi, I have been doing IF for about a month now. In the last two weeks or so I have started eating a complete keto friendly diet during my eating hours. I make sure that at very least I am doing a 16/8, and try to make it as small of an eating window as possible each day with at least a 16 hour fast.
    My question is, is it still fasting if I drink things like Arnold Palmer zero or water with Mio w/caffeine flavoring in it?
    I don't particularly like coffee, and I actually despise plain water. I have successfully done fast up to 1 week before, but while drinking the Arnold Palmer zero, and the water with zero calorie flavor in it. Am I sabotaging my own fast? I have looked and looked, and I see definitive answers about sweeteners, when I do use sweeteners I use stevia, pretty sure that that's okay, and I've seen a whole lot of definitive answers about diet pop, which I don't drink, but what about other zero calorie beverages? What about like the flavored fizzy water and stuff like that? Thanks!
  26. Katie Knies
    I have done some IF over the past 4 months as well as eating LCHF with really very little results. I have been diagnosed with NAFLD and realize that it may take awhile for my body to heal before I see much weight loss. However, I had a bad gall bladder attack a couple of weeks ago and ended up having to have my gall bladder removed. I haven't fasted much since surgery because of having to take medication with food but am wanting to get back into an IF schedule. Just wondering if it matters as to whether I do ADF or a shorter fasting window every day (18:6 or 24 hrs) since not having a gall bladder. I would love to be able to do ADF as I believe that will help heal the fatty liver and insulin resistance. Just want to make sure I am doing the right way considering my current situation. Also the "high fat" option is going to take a while as I will be increasing my fat very slowly. Thanks in advance for any advice.
  27. K.P.Suganya Devi
    Hi doc
    this is Suganya from India, won't fasting create thyroid imbalance and hypothyroid issue?
  28. Mike
    I completed a 24 hour fast before I read these articles. Constipation was the most unwanted side effect. Because I started Keto I should have read your articles first. Thank you for all the information. Keto is a way of life as well as fasting. It’s now my way and thankful to lose my belly fat. I’m down from 202 lbs. to 193 in 2 months and still losing. The fasting is easy I just have to be diligent not to get plugged up. P
  29. Mike
    I completed a 24 hour fast before I read these articles. Constipation was the most unwanted side effect. Because I started Keto I should have read your articles first. Thank you for all the information. Keto is a way of life as well as fasting. It’s now my way and thankful to lose my belly fat. I’m down from 202 lbs. to 193 in 2 months and still losing. The fasting is easy I just have to be diligent not to get plugged up.
  30. Sue

    I have a brother who has chronic kidney disease stage 4. His GFR is 27 and his creatinine is 4.0. Is it safe for him to do intermittent fasting and or water fasting? Can fasting help improve his condition?

    Thank you!

  31. 3 comments removed
  32. William
    A question. What if you're taking daily supplements ( three times a day) that require food to accompany them?

    I'm 62 and I work out six days a week; five of those, twice a day. Right now, I've reduced my breakfast to half a banana. It doesn't feel like a big challenge to even skip that. I think I'm in pretty damn good shape for my age, but I think I could be a lot better.

    Thank you.

  33. Lionheart
    I tried IF 16:8 for the first 4 x months of this year. I combined this with LCHF. At the beginning of May my body weight and fat% had not changed at all since January 1st.
    Your thoughts ?
  34. Tracey
    I have a prolactinoma. Will fasting help shrink it?
  35. SuperB
    I'm currently doing this fast and I have NOT noticed any weight loss yet. I'm 6'2" 250 lbs. I limited my calorie goal to 1600 a day. I try NOT to eat any carbs like pasta and bread. What am I doing wrong? Also a buddy of mine told me i could eat as much as I want during my time to eat. Isn't this in correct? I'm doing the 16/8 rule.
  36. Rebel McRoberts
    Anorexia is sustained starvation. This is not. You clearly did not read the article as intended, and instead, superimposed your own situation over it. If you truly studied nutrition as you claim, you would have a better understanding between the mental/emotional components of anorexic starvation versus IF.
  37. 1 comment removed
  38. Nathan D Perry
    1 minute ago
    Is drinking a soda or orange juice considered the same as eating? Or is ok to have a cup of juice or soda instead of coffee or tea as you say to help the hunger wave pass?
    Click to Edit
  39. Monica Livingston

    I started a week and few days ago the fasting from 11am to 7pm and I been feeling great! one question I wanted to ask is can I drink a vitamin drink in the morning before 11am? (specifically Zipfizz) I know I read that it will be important to take a multi vitamin when doing the fasting.

    Protein Drink 3grams of carbs before 11am? I don't think so but asking for a friend to be sure.

  40. Dawn Harris
    Deborah, have you found why you are not losing weight? I am in a similar situation. Thank you!
  41. Theresa
    Is it okay to drink bulletproof coffee during a fast or is that considered a meal?
  42. Nathan D Perry
    Im not a doctor in any way, nor am i in any way related to the website. But, you definitely do NOT want to take a multi vitamin on an empty stomach. More often than not you will get nauseous because most multis are fairly hard for the stomach to break down on its own without secreting excess acids.
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