Intermittent Fasting: What You Can Eat & Drink During a Fast

March 25th, 2017|Nutrition, Fat Loss|
Intermittent Fasting - What You Can Eat & Drink - Myolean Fitness

“I’m doing Intermittent Fasting. What can I eat and drink during my fast?”

“Can I eat/drink [insert food/drink] during my fast?”

“Does x number of calories break a fast?”

“Will drinking BCAAs break my fast?”

“Do artificial sweeteners break a fast?”

All these are commonly asked questions by people who engage in different types of intermittent fasting, whether that’s alternate day fasting, the Lean Gains protocol, 5:2, and so on. And all are perfectly valid questions to ask, mind you.

Unfortunately, however, the answers to the questions above are a little more complicated and less straightforward than you may think. Don’t you worry, though, because, by the end of this article, your questions will be answered!

By the way, big shout out to the IF Facebook group, if that’s what brought you here!

What is Intermittent Fasting?

Before we talk about what you can eat during a fast, let’s first briefly explain what intermittent fasting is.

Simply put, intermittent fasting is, essentially, an eating pattern which involves alternating periods of little or no energy intake (i.e. caloric restriction) with intervening periods of normal food intake, on a recurring basis.

There are, generally, three different types of intermittent fasting according to research:

  • Alternate day fasting (ADF), which involves a 24-hour fasting or very low calorie period, alternated with a 24-hour ad libitum eating period.
  • Whole day fasting (WDF), which usually involves 1-2 days of fasting or very low calorie periods per week, with the remaining days of the week eating at maintenance.
  • Time-restricted feeding (TRF), which involves a fasting period of 16–20 hours and a feeding period of 4–8 hours daily, and includes the Leangains protocol by Martin Berkhan. This is probably the most popular of the three types of intermittent fasting.

An example of a TRF protocol is as follows: you may set your fasting period to be from 10 pm on one day until 4 pm on the following day. This gives you 18 hours of fasting and an eating window of 6 hours (from 4 pm until 10 pm every day). This is known as the 18:6 protocol among those practicing intermittent fasting. 

Other protocols are 14:10 (fasting for 14 hours), 16:8 (fasting for 16 hours), 20:4 (fasting for 20 hours) and so on.

Which leads us to our next question.

What exactly is fasting?

According to the Merriam-Webster Dictionary, to fast can mean one of two things:

  1. to abstain from food, Intermittent Fasting - What You Can Eat & Drink During a Fast - Myolean Fitnessand
  2. to eat sparingly or abstain from some foods.

As you can understand, since fasting can, technically, mean both completely abstaining from food AND eating a little/not eating some foods, we’re in a bit of a pickle.

Remember when, at the start of this article, we said that things are not as straightforward as you may think? Well, this is partly why.

Hold your horses, though, because this is going to get a little more complicated.

Why would someone fast in the first place?

The motives behind why people fast are also something important to consider when trying to decide what you can eat and drink during a fast, as this can affect what you are technically “allowed” to have.

So why do people fast?

Well, different people fast for different reasons, the most common ones being:

  1. to lose fat and weight,
  2. to improve their health and increase longevity,
  3. for religious reasons, and
  4. to test their “mental toughness”.

What you can eat and drink during a fast

Okay, so let’s consider the reasons we listed above for why people fast and try to figure what you can eat and drink during your fast for each of these reasons.

1. Fasting for fat loss and weight loss

To answer the question of what you can eat and drink during your fast when your primary goal is weight loss, we must first consider how fasting helps with weight loss in the first place.

In short, the general line of thinking goes like this: When doing IF, the fasting periods result in lower insulin levels and higher human growth (HGH) hormone levels which, in turn, cause increased fat burning and, consequently, weight loss.

Is this, however, an accurate description of what happens? Well, according to scientific research, it’s true that, when we fast, our insulin levels drop and our HGH levels increase. What does research show, however, with regards to the end result, i.e. actual fat and weight loss? Do fasting-related lower insulin levels and higher growth hormone levels really result in more fat loss?

With regards to insulin, we can look at research comparing low carb/ketogenic diets with energy- and protein-matched higher carb diets for the answer, since these were designed to examine whether insulin per se plays a key role in fat loss. In short, a number of well-controlled studies such as this metabolic ward studythis metabolic ward study and this meta analysis provide good evidence to support the idea that low carbohydrate diets and ketogenic diets don’t seem to work better for fat loss when caloric and protein intakes are controlled for.

With regards to human growth hormone, research on intermittent fasting can shed some light. In short, studies that have compared intermittent fasting approaches to continuous energy restriction while controlling for caloric and protein intakes, such as this one, this one, and this one, have shown that, overall, the two diet types result in identical outcomes in terms of body weight and body fat reduction.

Why is that, however? If lower insulin levels and higher growth hormone levels aren’t the reasons why intermittent fasting works for fat loss, then how does intermittent fasting work?

Well, as we’ve talked about before, fat loss is the result of a sustained imbalance between energy intake and output. Simply put, to lose fat we have to take in fewer calories than we expend consistently over time. This is indisputable, by the way, and supported by every well-controlled study in the history of ever.

And this is, essentially, how intermittent fasting (and every other diet approach) works for weight loss – by helping you eat less, overall.

Intermittent Fasting - How it Works - Myolean Fitness

So where does this leave us with regards to what you can eat and drink during your fast?

Well, in reality, if your only goal is weight (and fat) loss, you can technically eat and drink anything you want at any time of the day, provided that you are maintaining a caloric deficit.

Eating throughout the day, of course, means that you won’t be doing intermittent fasting. And, yes, this means that you don’t HAVE TO do intermittent fasting if it isn’t practical for you and if it doesn’t help you adhere to your diet.

Remember, intermittent fasting is merely a meal timing tool which is supposed to help you control your caloric intake.

Take home point:

If your primary goal is to lose weight, the answer to the question “can I eat/drink [whatever] during my fast?” is “you can, technically, do whatever you want, as long as you are maintaining a caloric deficit consistently over time.

However, if you are consuming foods/drinks with calories, you wouldn’t be fasting. But it doesn’t really matter, since it’s not the fasting per se that causes fat and weight loss, but, instead, the fact that intermittent fasting helps most people eat less overall.”

2. Fasting for better health

Next on our list is fasting for better health.

Okay, so you don’t, technically, have to fast to lose weight, but fasting can improve health and increase longevity, right? After all, scientific research has shown that fasting results in a number of health benefits, including:

Well, unfortunately, if you take a closer look at the studies most health blogs usually cite, you will realize that the available scientific research suffers from a number of serious methodological problems, including that it is mostly limited to:

  1. animal studies – a number of systematic reviews such as this one, this one, this one, this one, and this one, have demonstrated poor clinical utility of animal experimentation,
  2. in vitro studies – i.e. in a test tube,
  3. mechanistic studies i.e. studies discussing how one thing might affect another, but not actually trying it and seeing it happen in real life, and
  4. studies that don’t control for caloric intake  caloric restriction and weight loss have been shown to have a multitude of health and anti-aging benefits in countless of studies. Since intermittent fasting tends to result in caloric restriction, it’s difficult to attribute the health benefits found to fasting per se, when there is the confounding variable of energy balance.

In short, what we currently know from human research is that there MAY be health and longevity benefits to fasting without caloric restriction, but that there is, currently, no strong evidence to support this.

“But this article/study says that fasting has health benefits”.

Okay, before you rush to any conclusions, investigate further!

Don’t just accept what the news website reports or what the abstract of a study says as facts just because they tell you what you want to hear. More often than not, claims are, at best, exaggerated by news websites, while study abstracts usually don’t tell the full story.

Intermittent Fasting Increases Lifespan - Myolean Fitness

Remember to check the four points above, i.e. that the study referenced:

  1. is not in animals,
  2. is not in vitro,
  3. is not mechanistic in nature, and
  4. that it controls for energy intake.

So where do the above us with regards to what you can eat and drink during your fast when fasting for increased health and longevity?

Well, simply put, focusing on just fasting to improve your health is missing the forest for the trees, since it doesn’t look like it’s fasting per se that has health benefits but, instead, the overall decrease in energy intake as well as the accompanied fat loss.

Take home point:

Fasting MAY have some health benefits, but there is no strong scientific evidence to support this yet, so don’t stress about x food/drink breaking your fast or not. Remember that there are a few things that you can do that are much more important than fasting.

If you want to improve your health, make sure that, above all, you are:

  • maintaining a healthy weight,
  • eating a diet that is based on plants, lean proteins and healthy fats,
  • exercising regularly,
  • not smoking,
  • not drinking excessively,
  • not stressing, and
  • maintaining healthy social relationships.

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3 & 4. Fasting for religious reasons and to test mental toughness

Fasting for these reasons is more of a personal matter and beyond the scope of this article. If your religion says that you have to completely abstain from foods for so many hours or from some foods for so many days, it’s entirely up to you to decide whether you want to do it or not.

The same applies to fasting for mental toughness. If you want to test your limits and see how long you can fast for, it’s your decision to make.

Just bear in mind that prolonged fasts can be dangerous and should, preferably, be done under the close supervision of a licenced health professional.

Let’s recap

Okay, so with all the above in mind, let’s recap and try to answer all the questions asked at the beginning of the article.

“I’m doing Intermittent Fasting. What can I eat and drink during my fast?”

If you are doing intermittent fasting to lose fat and weight, you can technically eat and drink whatever you want at any time of the day, provided that you are maintaining a sustained caloric deficit over the long term. This means that IF may help you lose fat if it makes it easier for you to reduce overall energy intake, but that you don’t HAVE TO do IF to lose fat and weight.

If you are doing IF for the purported health and longevity benefits of fasting, you may be disappointed to hear that we don’t know for certain if these exist in humans yet. There are a few things you can do that will have a much larger impact on your health anyway, such as maintaining a healthy body weight, eating a diet that is based primarily on plants, lean meats, fish and healthy fats, exercising, not smoking, not drinking excessively, not stressing too much, and maintaining healthy social relationships, so it’s a better idea to focus your energy on these instead.

“Can I eat/drink [insert food/drink] during my fast?”

Does eating/drinking that food or drink make it easier for you to improve your overall diet in terms of better food quality and lower calorie intake? If yes, go for it. If no, don’t.

“Does x number of calories break a fast?”

There’s no set number of calories that breaks a fast. The person who first came up with this probably did so to allow people to have a splash of milk or cream in their coffee without stressing about it, but to also keep them from going overboard with the calories and not managing to create a caloric deficit by the end of the day.

“Will drinking BCAAs break my fast?”

Despite what most people think (and what the nutritional info label on your BCAA product says) ALL BCAA products contain calories. Leucine and isoleucine contain 6.5 calories per gram, while valine contains 6 calories per gram. With the typical 2:1:1 ratio of most BCAA products, this means that 10g of BCAAs contain around 63 calories.

So yes, BCAAs break your fast. However, it doesn’t really matter if they do or don’t in the first place.

“Do artificial sweeteners break a fast?”

Artifical sweeteners contain, practically, no calories, so they don’t break a fast. For example, a typical can of aspartame-sweetened soda contains less than half a calorie.

Also, contrary to what many people think, artificial sweeteners don’t cause insulin secretion (diabetics would be dropping dead everywhere if this was the case) or somehow make you gain fat or weight (the association between artificial sweetener consumption and obesity in research doesn’t imply causation – it most likely means that people who are overweight tend to switch to diet soda in an effort to lose weight).

What next?

If you enjoyed this article and found it informative, you’ll probably also like these ones as well:

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    • Myolean Fitness 30/10/2017 at 4:32 pm - Reply

      Thanks for your comment, Tom.

      Unfortunately, although this article is being shared all the time, no one seems to have bothered to look up the actual research that it is based on. Here it is:

      As you will notice, the studies were done on mice and, unfortunately, nutrition and supplementation research almost never translates well from mice to humans.

      Here’s a quote from our article:

      “You see, although it has been claimed multiple times that fasting can improve health and increase longevity, the research showing these benefits is limited to:

      – animal studies (which 99.9% of the time don’t translate to humans in drug/nutrition/supplementation research)
      – in vitro studies (i.e. in a test tube)
      – mechanistic studies (i.e. studies discussing how one thing might affect another, but not actually trying it and seeing it happen in real life)
      – studies that don’t control for caloric intake (caloric restriction and weight loss have been shown to have a multitude of health benefits in countless of studies)”

      • Jennifer 26/01/2018 at 5:12 am - Reply

        Anyone who watched interviews on Dr Longo (or read his book on the fasting mimicking diet) the medical scientist who conducted early clinical studies on intermittent fasting using mice and humans he explains how the body and cells reacts to fasting and refeeding and the benefits will know that the concept for their studies was not based on the dictionary’s definition of fasting but rather on cellular changes that occurs when the body is in the fasting stage but more importantly the refeeding phase that generates weight loss and a multitude of health benefits.

        • Myolean Fitness 26/01/2018 at 10:43 am - Reply

          Hi Jennifer and thanks for your comment.

          It’s funny that you are mentioning Valter, as I have read pretty much all of his research on fasting 🙂

          What I would encourage you to do is to read his actual research rather than just listen to podcasts and interviews, as the former goes through a peer-review process which ensures that he is less likely to make exaggerations that can easily be made outside of the peer-review process.

          Here’s, for example, a 2017 review of intermittent fasting on health and disease from Valter that you can read:

          If you focus on the research that is in humans, you’ll notice that the effects of IF can’t really be separated from those of caloric restriction. As we’ve mentioned in the article above, “caloric restriction and weight loss have been shown to have a multitude of health and anti-aging benefits in countless of studies. Since intermittent fasting tends to result in caloric restriction, it’s difficult to attribute the health benefits found to fasting per se, when there is the confounding variable of energy balance.”

          Here are a few quotes from the study that you may find interesting:

          On insulin sensitivity: “Thus, IF has been reported to have variable effects on peripheral and hepatic insulin sensitivity which may be different in obese and normal weight subjects and may be gender-specific. Further studies are required using more robust measures of insulin sensitivity e.g. insulin clamp or other techniques.”

          On cardiovascular disease: “However, there have been few studies that have evaluated the relative effects of IF and Continuous Energy Restriction on cardiovascular risk markers. The randomized comparisons of IF and Continuous Energy Restriction have reported equivalent reductions in blood pressure (Hill et al., 1989a; Harvie et al., 2011, 2013a) and triglycerides (Hill et al., 1989a), (Ash et al., 2003). (Harvie et al., 2011, 2013a), and increased LDL particle size (Varady et al., 2011).”

          On cancer risk: “Thus, although limited,the available biomarker data suggest that IF leads to comparable changes in most cancer risk biomarkers to Continuous Energy Restriction, with the possible exceptions of insulin resistance and adiponectin which require further study using robust methodologies. ”

          Looking forward to your thoughts!

  1. Corey Ashe-Bradford 01/11/2017 at 6:55 pm - Reply
  2. D. Matt 01/12/2017 at 7:30 am - Reply

    Animal studies 99.9% don’t translate to humans in drug/nutrition/supplementation research? That’s an extremely high failure rate. I’m assuming this figure was pulled from a peer-reviewed journal, since it’s such an exact value? Would you mind posting a link to the source in which you pulled this figure from? Much appreciated!

    • Myolean Fitness 01/12/2017 at 10:30 am - Reply

      Hello Matt and thank you for your comment.

      That was, indeed, an exaggerated statement on our part, and it has been edited to be more accurate.

      Thanks again!

  3. Teddy 15/12/2017 at 12:02 am - Reply


    Thanks for the article.

    I am curious if you have had a chance to look at some of the studies that claim fasting can:
    – Decrease insulin resistance
    – Increase HGH levels
    – Increase testosterone levels
    – Increase sirtuin production

    Are they founded? Has calorie control been known to trigger these same effects?

    Also, you address fat-loss but are vague to what that entails and if that keeps in mind body composition. Are there not studies that show body composition can be improved by ketosis? And that ketosis triggers muscle sparing that contributes to body composition during weight loss?

    Would love to hear what you/the-body-of-science think!


    • Myolean Fitness 15/12/2017 at 10:54 am - Reply

      Hi Teddy and thanks for your comment!

      OK, so perhaps the biggest “problem” with research on IF is that it often doesn’t control for caloric intake – and people aren’t taking this into account when looking at research.

      Think about this – We know that caloric restriction (and the associated weight loss):
      – results in improvements in insulin sensitivity (in overweight people)
      – results in improvements in testosterone levels (in overweight people)
      – results in increased sirtuin production and longevity

      So if a group of subjects are doing IF while also eating a hypocaloric diet, then can we attribute the beneficial outcomes to IF, when we know for a fact that caloric restriction also has the same beneficial effects? 🙂 In my opinion, no.

      You can check out this narrative review on the topic, for example, (, which looked exclusively at studies that matched caloric intake between groups (TRF and CER) and which concluded that the available research hasn’t yet shown any definitive benefits of IF with regards to weight loss, insulin sensitivity, RMR, etc.

      You’ll notice that the review above also looks at lean body mass retention, and essentially concludes that IF doesn’t seem to have any LBM sparing benefits when calories, protein and physical activity are controlled.

      Regarding HGH, I think most people are misunderstanding what exactly is happening and why. In simple terms, HGH increases during fasting simply as a normal physiological response to help substrate mobilization. It’s the same as, say, insulin increasing when we eat in order to increase the uptake of glycogen and amino acids in muscles, increase the synthesis and absorption of lipids in fat tissue, etc. There’s nothing “good” or “bad” about these. They are just normal physiological responses that happen for a reason and, outside the context of the overall surpluses and deficits that happen all the time, don’t really mean much.

      Regarding ketosis, again, when calories and protein are controlled for, there’s little reason to believe that it should result in improved body composition relative to a higher carb diet. To learn more about this, I would urge you to read the “Carbohydrates” part of this paper:

      Would be interested in hearing your thoughts!

      P.S. I’ve written an article for another big fitness website discussing much of what you’re asking here, which should be published sometime this month! We’ll share it through our social media accounts when it does, so keep an eye out for it! 🙂

      • teddy 16/12/2017 at 12:36 am - Reply

        Thank you for such a quick and thorough response, I’ve learned a lot ! Looking forward to your next article.

        • Myolean Fitness 17/12/2017 at 10:15 am - Reply

          Happy I could help!

  4. Marisa Esposito 19/12/2017 at 8:49 pm - Reply

    The important thing about a ketogenic diet is not that it somehow magically increases metabolism, (it obviously doesn’t,) but rather that it puts your metabolism in a different “mode” (burning fat when you run out of sugar and deplete glycogen stores.)

    Yes, a calorie is a calorie. BUT, prolonged low blood sugar states (induced by reducing carb intake via keto diet) COMBINED with intermittent fasting will burn more fat than intermittent fasting combined with a typical diet including carbs. In the latter, during which the metabolism will be in it’s default glucose-burning mode, much of the “fasting” period will be spent burning through glycogen stores in the muscles. Only after the glycogen stores are depleted and the subject maintains fasting will actual fat loss occur. The studies provided only looked at energy expenditure, which misses this very important point entirely.

    Again, this is not a disagreement. A calorie deficit is the only way to burn fat. It’s just that a ketogenic diet will set your metabolism from it’s default glucose-using state to the fat-using state (ketosis) BEFORE fasting begins, so that when it’s time to fast you spend more hours physically burning fat than having to burn through sugar first.

    • Myolean Fitness 21/12/2017 at 7:06 pm - Reply

      Hello Marisa and thanks for your comment.

      It’s true that ketogenic diets will cause the body to burn more fat. What you’re not considering, however, is that most of the extra fat burned is dietary fat and not body fat, since ketogenic diets are inherently high in fat.

      This is, of course, why metabolic ward research comparing ketogenic to non-ketogenic diets with matched calories and protein has consistently failed to detect any differences in fat loss between groups.

      I suggest you give this article a read:

      • Sam 03/01/2018 at 1:50 pm - Reply

        I have been doing Keto with IF and only things thats worked. For me. Tried lots fad diets, SW & WW. Loads gym etc. As soon as I stopped the carbs, sugars, ate fat ( which always a ovoided). Am 52 , gained subborn body fat, and was about to accept it was my age, hormones, etc… Had a stone and half to get off, which as I say was about to give up and accept my extra midriff
        What I will say YES I do have to eat around a set defacit, which is only way eating as a fat burner that my body will once its has used the dietry fat, has burnt off body fat!! It did do that, it fell,off. Woo hoo.
        I worked out my natural BMR. Deducted 500 cals. So once my body burns the dietry fat to that amount of fuel, of course it will go,burn the body fat for its remaining energy it needs to meet my BMR needs.
        Thats what I do.
        I also IF 16:8 every day, and it has maintained for first time ever!!
        Im keen to keep insulin levels ticking very low ( have type 2 diebetes in family) and I do think I could poss had been early insulin resistance, as carbs and sugars made me feel ruff.
        So basically keto, ‘fat burner’ does burn body fat, providing you stick to it, eat little carbs/sugar and moderate protein, count macros accoridng to calorie intake BMR with reduction of 15-20% so you are in defacit.
        Only those who,consume too much fat, and do,not moderate their macros, as yes fat is very high in cals, it wont burn anything other than dietry fat.
        Physically I feel,better, sleep,better, more energetic, aches and pains in joints eased, slimmer, skin better, and no,hunger pangs all time. I find IF easier on Keto, and even eat 2 meals nutrient dense a day only now.
        Our bodies in my olinion from my experience react mich better to natural,healthy fats, I eat plenty of low carb veg & salad. Mineral and vit suplliments to help.
        Keto & IF very powerful together for weight loss in controlled macro to calories needed for sure!!
        As for studies etc, I am going from personal experience and my own research. A dieter all my life, always gained weight so easy, yo yo dieting, for once at last found something that actually works and keeps it off.
        I know people whos diebetes and other health issues have gone, from ditching carbs and sugars, and eating fats. Amazing!!

        • Myolean Fitness 03/01/2018 at 2:01 pm - Reply

          Hey Sam,

          It’s great that an approach combining IF and keto has helped you control your energy intake and make healthier food choices! Keep it up! 🙂

          • csmats 30/01/2018 at 9:42 pm

            Myolean Fitness: “Yes, a Keto diet burns more fat, but it’s dietary fat that you’re eating a lot of, not body fat, which is the fat that makes you look fat.”

            Sam: “I’m on Keto and IF and I’m losing body fat like crazy.”

            Myolean Fitness: “Oh.”

            Perhaps that “Oh” should be changed to “D’oh!”

          • Myolean Fitness 30/01/2018 at 9:49 pm

            It truly is shocking how a ketogenic diet combined with IF can help you eat less and, consequently, lose fat!

          • csmats 31/01/2018 at 6:53 am


  5. Lucad 08/02/2018 at 11:59 am - Reply

    Based on what you say, there is no benefit in IF.

    It personally helped me deal with Myocarditis, and regulated my diet and Cravings. I never felt better. So there is a massive change in my life overall, not related to weight or fat lose as i never had this problem.

    Seems to me like you are gathering all the article that supports your claims, and there milions of more articles that says different. Ive been following dr. Eric Berg, and what you are claiming completely contradicts what he has been saying for years.

    So call me a bit naive, as i am a part of the general polulation, isnt it better to try things and decide for yourself what is benefitial and what is not? I only ask this as ifind your article very discouraging towards IF.

    There is a benefit in regards to insulin and sugar level stabilisation – i am a living example, and i am not an animal either.

    • Myolean Fitness 08/02/2018 at 4:25 pm - Reply

      Hello Lucad and thank you for your comment,

      You wrote: “Based on what you say, there is no benefit in IF.”

      Well, not exactly. What the article says is, and I quote: “In short, what we currently know from human research is that there MAY be health and longevity benefits to fasting without caloric restriction, but that there is, currently, no strong evidence to support this.”

      There’s a difference between saying that there is no benefit in IF and saying that there MAY be a benefit without caloric restriction, but there’s currently no strong evidence to support this.

      You wrote: “Seems to me like you are gathering all the article that supports your claims…”

      I can assure you that Myolean Fitness has no biases and we only care about the truth. I can also assure you that we would be extremely happy if new research shows that IF has, without a doubt, health benefits! If you think that there is strong research showing that IF has health benefits in humans in the absence of caloric restriction, please do share it with us 🙂

      You wrote: “Ive been following dr. Eric Berg, and what you are claiming completely contradicts what he has been saying for years.”

      In my opinion, Eric is not a good source of nutrition information – chiropractors generally get pretty much no nutrition education. Also, a quick Google search suggests that Eric is not a very trustworthy practitioner (

      Regarding trying things for yourself, we absolutely recommend that you do!

      Also, we are definitely not against IF and, in fact, we have several of our clients on numerous IF protocols. We just prefer to remain objective and unbiased, not letting our feelings regarding any dietary and training approach cloud our scientific opinion of them.

      Regarding insulin and sugar level stabilization, the research is mixed. Here’s a quote from an article I wrote for another website:

      “One study by Ash et al, for example, reported similar improvements in glycaemic control in 51 men with type 2 diabetes after 12 weeks of intermittent (four days per week) or continuous energy restriction (6).

      A 2011 study by Harvie et al which measured hepatic insulin sensitivity in overweight or obese subjects reported a 25% greater reduction in insulin resistance compared to the daily energy restriction group when measured on the morning after five normal feeding days.

      It also reported a further 25% reduction in insulin resistance compared with daily energy restriction on the morning after the two energy-restricted days. Importantly, these differences in insulin sensitivity happened despite similar reductions in body fat between the groups (4).

      Three other studies that have assessed the effects of 2–3 weeks of whole day fasting and which were designed to ensure that there was no overall energy deficit or weight loss have also reported variable results.

      Specifically, the first study by Halberg et al reported improvements in insulin-mediated whole-body glucose uptake and insulin-induced inhibition of adipose tissue lipolysis when measured after two normal feeding days (29), while these results could not be replicated by the Soeters et al study (22).

      Interestingly, the third study by Heilbronn et al reported a significant reduction in insulin response and improved glucose uptake and insulin sensitivity in male subjects, whilst female subjects experienced impaired glucose uptake and apparent skeletal muscle insulin resistance (30).

      Overall, the limited available research has reported variable effects of intermittent fasting on peripheral and hepatic insulin sensitivity, which may be gender-specific.”

      I hope the above helps clear things up!

  6. james 18/02/2018 at 2:39 am - Reply

    Does intermittent fasting help to lower ones overall blood pressure ?
    Mine is about 130 and I would like to decrease it to 110

    • Myolean Fitness 18/02/2018 at 4:05 pm - Reply

      Hi James,

      When controlling for confounding variables, intermittent fasting on its own doesn’t seem to affect blood pressure (although there’s currently not much research on this).

      In general, what seems to reliably help reduce blood pressure is weight loss, exercise, stress management, and a good balance of dietary sodium and potassium (usually, for most people, the former needs to decrease and the latter needs to increase).

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