You wouldn’t believe how many times I’ve been asked if it’s ok to vape while fasting. Or whether vaping on a diet will help or hinder progress. Although I think the question I get most often is whether it’s ok to vape during Ramadan, the Islamic religious holiday.

    Now, I’m not a Muslim so this is just my personal opinion. But I always understood the act of fasting during Ramadan as a display of total self discipline. Removing pleasures considered impure, not just food and drink. When you add to that the fact that vaping with nicotine is addictive , I would think it’s fair to say you probably shouldn’t vape while fasting for Ramadan.

    Incidentally, I’ve also written a post about whether vaping will break Wudu which you might find of interest.

    BUT, what about those of us not fasting for religious reasons…

    If you’re fasting for weight loss for example. What then? Should you set aside your vape while fasting? More to the point perhaps, does e-juice contain calories? And if so, will vaping stop you losing weight?

    The short answer is NO..

    It’s perfectly ok to vape while fasting for weight loss. Although e-juice does contain calories, you ‘consume’ less than 5 calories per 1ml, which means vaping won’t interfere with your weight loss goals. In addition to this, nicotine is actually an appetite suppressor, which means vaping could actually help you to lose weight.

    It’s also worth noting that e-juice contains zero carbohydrates, so won’t affect those on a Ketogenic diet!

    But what if you’re fasting to improve your health rather than to lose weight? Studies have shown that fasting could have a range of health benefits (if done properly!) and it’s become something of a health craze in recent years.

    We already know e-juice contains very few calories, but does the body ‘recognise’ vaping in the same way it does food? And if so, will you lose the potential benefits of a fast if you reach for your vape?

    This is slightly harder to answer. First we need to take a look at what happens to your body when you fast, and what impact (if any!) vaping could have on this process.

    What happens to the body during a fast?

    In order to talk about fasting, it’s important to understand that your body is reliant on energy (among other things!) to survive. Our main source of energy is a sugar called glucose, which we absorb through our diet. Specifically carbohydrates. This glucose is stored by the liver and released into the bloodstream when we need it.

    During the first few hours of your fast, your body is using stored glucose. However, when your glucose reserve is depleted, your body enters gluconeogenesis to maintain blood glucose levels and prevent hypoglycaemia (low levels). Think of this as a ‘back-up plan’ of sorts, for production of new glucose in the absence of carbohydrates from your diet.

    As you continue fasting, your body will begin to use fat or protein to maintain your blood glucose levels. Your metabolism will also slow to conserve energy, which means your body will burn less energy in a resting state. This also has the added benefit of lowering your blood pressure and heart rate.

    The above process is ridiculously complicated, and I’m far from qualified to write at any length about it. But that’s the bare bones (fasting – get it?…) and all we really need to know for now.

    What are the benefits of fasting?

    In terms of the general benefits, it’s believed that fasting cleanses or ‘detoxes’ the body and forces our cells to adapt and thereby grow stronger. A bit like exercising any other part of the body – placing the muscle under stress and forcing it to adapt and grow.

    Makes sense right?

    Now fasting has been touted as a miracle cure-all by some, and I’m not sure I quite believe everything I read on the subject. BUT, several studies have found that fasting could not only reduce your blood sugar levels , but also improve blood sugar control by reducing insulin resistance . Which is a potentially HUGE benefit for those suffering from, or at risk of, type 2 diabetes.

    Decreasing insulin resistance can increase your sensitivity to insulin, which in turn allows your cells to make more efficient use of the glucose in your bloodstream. So if fasting reduces blood sugar levels, while simultaneously increasing your sensitivity to insulin, this could help you balance your blood sugar and reduce the risk of dangerously high or low levels.

    Still with me?

    Further studies have shown that fasting could also decrease inflammation in the body , and research confirms that chronic inflammation may be a contributing factor for various diseases, such as diabetes, cancer and arthritis.

    Fasting has been linked to a whole host of other health benefits, ranging from decreased blood pressure, to lower cholesterol and improved heart health. You get the picture – it’s fair to say that fasting properly could have positive effects on your overall health.

    So should I vape while fasting?

    One of the key benefits of fasting, as we’ve talked about above, is the belief that our cells adapt by entering a state they wouldn’t have otherwise entered when receiving a constant supply of energy via the food we consume.

    So in my mind, the first and most important thing to consider is whether the e-juice we vape provides the body with a supply of energy. In other words, if e-juice is ‘recognised’ by your body as a source of calories or energy the same way food is, then to vape while fasting is like trying to dig your way out of a hole – you won’t achieve anything.

    After all, you’re not really fasting if your body is receiving a replacement source of ‘fuel’ in the form of the e-juice you’re vaping.

    Surprisingly, the scientific community don’t appear to actually know what happens to the calories absorbed into the lungs during vaping. I expected to find a study or research paper that would put this issue to rest, but I had no such luck at the time of writing. But this doesn’t necessarily mean you shouldn’t vape while fasting – it could very well be the case that the body receives ZERO calories or energy from the e-juice you vape.

    Now full disclaimer here, I’m no doctor.

    BUT it seems unlikely to me that the body would recognise the e-juice we’re vaping as a source of fuel, primarily because we’re not actually digesting the e-juice.

    So if we’re looking at this as purely a case of whether it’s possible to place your body into a state of fasting if you continue to vape, the answer is yes! There’s no reason to believe the e-juice you inhale will inhibit your ability to properly fast.

    But will I experience the benefits of fasting if I continue to vape?

    Yes and no.

    First the good news. I found this study , conducted to determine if smoking affected fasting blood sugar levels. I know the focus is on cigarette smoke, but the results should be comparable to vaping. The participant’s blood sugar levels were tested before, during and after smoking two cigarettes in 60 minutes.

    The results?

    “When 24 normal subjects under basal conditions smoked two thirds of 2 cigarettes, there was no appreciable rise in the levels of the fasting blood sugar”.

    The bad (but expected) news is that the study found the blood pressure and pulse rate of the participants was significantly raised after the 2 cigarettes. This was expected because nicotine is a stimulant, and the same effect is likely to be seen when vaping e-juice containing nicotine.

    In terms of insulin resistance (a benefit of fasting is reduced insulin resistance) a recent study found that e-cigarette exposure or use was not associated with increased insulin resistance. So to summarise, the benefit to your blood sugar level and insulin resistance obtained by fasting, should not be affected by vaping.

    However, I did find some potentially troubling news. This study , conducted in January 2021 found that repetitive use of e-cigarettes may disrupt the integrity of the gut barrier, increase the susceptibility of the gut lining to bacterial infections and trigger inflammation.

    I still believe vaping is a far healthier alternative to smoking, but this is obviously somewhat concerning. I’m hoping further studies will help to shed some light on these findings and I’ll be sure to post an update.

    And there you have it folks. If you were wondering whether you should vape while fasting, hopefully by now you have enough info to make an informed decision. Please feel free to share this post, and comment below with your thoughts. Happy vaping (and fasting!)

    Does vaping break a fast for blood work?
    If a person has been asked to fast before a blood test, they should avoid smoking. If you vape, it's fine to continue doing this during your fast. more
    What is a 12-hour fast for blood work?
    Fasting means you don't eat or drink anything but water usually for 8 to 12 hours beforehand. If your appointment is at 8 a.m. and you're told to fast for 8 hours, only water is OK after midnight. If it's a 12-hour fast, avoid food and drink after 8 p.m. the night before. more
    Does blood test break fast?
    Examples of blood tests that may require you to fast include: a fasting blood glucose test (used to test for diabetes) – you may be asked to fast for 8 to 10 hours before the test. an iron blood test (used to diagnose conditions such as iron deficiency anaemia) – you may be asked to fast for 12 hours before the test. more
    Will blood test break your fast?
    If you are required during Ramadan to have a blood test, then this does not break the fast. However, if you are unwell during Ramadan, then you will likely be exempt from fasting. While blood tests are fine, Muslims are generally advised not to donate blood during Ramadan, unless absolutely necessary. more
    How fast does Eliquis work on blood clots?
    Effect on blood clotting factors happens within a few hours of taking a single dose of Eliquis. When Eliquis is stopped, its effect on clotting begins to wear off within 24 hours. more
    Does water break a fast for blood work?
    Yes, you can drink water while fasting before a blood testβ€”in fact, drinking plenty of water can help ensure that you receive accurate test results. Dehydration can affect certain blood tests such as cholesterol, electrolyte and BUN tests. more
    Does coffee break a fast for blood work?
    Certain types of blood tests will require you to abstain from coffee, among other kinds of food and drink, for several hours to ensure that your test results are accurate. For example, you might need to skip your morning coffee before taking a glucose test, especially if you normally take it with sweetener and milk. more
    How fast do blood thinners work on clots?
    Because it can take 5-7 days (or longer) for the warfarin to take effect, patients will initially take both drugs. more
    Does lemon water break a fast for blood work?
    A: Yes. You can drink as much water as you want, but it should be plain. Avoid lemon-flavored and carbonated waters, as well as teas until after your test. more
    Does smoking vape break your fast?
    It's perfectly ok to vape while fasting for weight loss. Although e-juice does contain calories, you 'consume' less than 5 calories per 1ml, which means vaping won't interfere with your weight loss goals. more
    How long do you have to fast for blood work?
    To fast for blood work, do not eat anything for eight to 12 hours before the test. 1 You may drink water, tea, or black coffee (no sugar or milk added). It's best to schedule fasting blood work for the morning, so that you don't have to spend the whole day hungry. more


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