The Ultimate Guide to Intermittent Fasting for Acne

The Ultimate Guide to Intermittent Fasting for Acne

Could skipping breakfast be the secret to clear skin?

Celebrities, business icons, and health experts have been hyping up intermittent fasting quite a bit lately.  Many people are now using it for weight loss, disease prevention, and even increased productivity.

It’s scientifically-proven health benefits are practically endless:

  • Anti-aging effects
  • Immune system support
  • Lower oxidative stress
  • Cancer prevention

That’s why it’s no surprise that implementing intermittent fasting can be beneficial for our skin too.  But is it worth the risks, and more importantly, the hunger?  Let’s jump right in…

What is intermittent fasting?

The basic idea of intermittent fasting is simple – eat all your food for the day during a short period of time, and don’t eat (fast) the rest of the time.

This usually means skipping a meal or two and having larger meals later in the day.  It could be as simple as skipping breakfast or as extreme as having only one meal a day.


Intermittent fasting is not a diet – it isn’t about what you eat, it’s about when you eat.  Intermittent fasting can be looked at as a pattern of eating, providing a framework for when you should and shouldn’t eat throughout the day.

Does this mean you could eat pizza and spaghetti while intermittent fasting?  Technically, yes – but it doesn’t mean you should.

Intermittent fasting is a powerful tool that can amplify the results of your existing diet and help your body recover from dieting mistakes faster.  It’s not a license to eat acne-causing food and walk away untouched, but it can be an extremely effective asset for clear skin.

A healthy diet combined with intermittent fasting can lead to clearer skin

The Health Benefits of Intermittent Fasting

There’s a reason intermittent fasting has become so popular lately – it works.

Benefits of intermittent fasting - sleep, life span, disease prevention, less acne

The health benefits of intermittent fasting are huge:

  • Decreased risk for certain cancers (R)
  • Improved learning and memory performance (R)
  • Promotes cardiovascular health (R)
  • Reduced blood sugar and increased insulin sensitivity (R)
  • Increased stress tolerance (R)
  • Better sleep (R)
  • Reduced inflammation (R)
  • Increased life-span & anti-aging (R)

With that being said, there’s still a lot of research to be done on intermittent fasting.  It’s only recently become a major topic of discussion in the scientific community, and several of the findings above are from animal studies.

I can tell you first-hand that intermittent fasting has significantly improved the quality of my own life and skin.  Here are some of the benefits I experienced:

  • Fewer cravings for acne-causing foods like pizza or french fries
  • I spend less time thinking and planning my meals – I just eat until I’m full during my feeding window
  • Increased energy, mood, and mental performance
  • I fall asleep faster and stay asleep longer
  • Less acne from cheat meals/foods

There’s a simple reason for this: intermittent fasting directly influences almost all the root causes of acne.

How Intermittent Fasting Eliminates Acne

A healthier body means healthier skin – so it’s no surprise that intermittent fasting is one of the absolute best things you can do for your skin.

Because intermittent fasting addresses several of the root causes behind acne, not only will you have more energy, clarity, and focus, but your skin will show it.

How intermittent fasting prevents acne - decreased inflammation, better sleep, more stress resistance, lower insulin levels, lower IGF-1

1. Intermittent Fasting Reduces Insulin Resistance

Insulin resistance is one of the single largest drivers behind acne.  It’s estimated that upwards of 100 million Americans have some form of insulin resistance (R).  Let’s be honest, in a culture where carbs are around every corner, this isn’t that surprising.  Is it simply a coincidence that rates of acne are at all-time highs too?  I don’t think so…

For an in-depth look at how carbs, insulin, and acne are related, check out my in-depth article.

For now though, just know this – insulin is bad for acne.  It triggers the release of hormones that block pores, force the skin to produce too much oil, and worsens inflammation.  When you consistently eat too many carbs and don’t give your body a chance to burn them off, you develop something called insulin resistance, which is where your body needs more and more insulin to do the same job.  More insulin means more acne.

How carbs and insulin cause acne - glucose triggers insulin to be released, which then releases IGF-1, IGFBP-3, and IL-1, which block pores and trigger inflammation

Intermittent fasting is one of the best things you can do to keep your insulin levels down, deplete your glycogen stores, and decrease insulin resistance.

When you’re not eating for 16, 18, or 20 hours a day, you’re giving your body a chance to burn off the glucose it already has stored up.  By doing this, you’re also giving your body a chance to decrease the levels of insulin in your blood.

It looks like the sweet spot for intermittent fasting is somewhere around 18 hours.  That’s where your insulin levels dramatically drop and an amazing process called autophagy really gets going.  More on that in a bit…

2. Intermittent Fasting Decreases Inflammation

Have you ever wondered why red, angry, inflamed pimples occur in the first place?  Chronic inflammation is to blame, and it’s one of the core drivers behind acne

From time to time, pores on the skin become blocked.   With no exposure to the air, bacteria floods the area and causes a minor infection.  In response to this infection, your body sends out inflammatory chemicals to deal with it.  Two problems occur here:

  1. The infection in the pore isn’t all that dangerous in the first place
  2. The body overacts to this minor infection due to chronic inflammation

The end result is a large and inflamed pimple that just won’t seem to go away.

How chronic inflammation causes acne - a blocked pore becomes infected and triggers an inflammatory response, which creates swelling, redness, and irritation

The reason this occurs is that most modern diets are extremely high in pro-inflammatory foods, like vegetable oils and processed foods, and extremely low in anti-inflammatory foods, like wild-caught seafood (salmon, sardines, mackerel) and meat liver.

Vegetable oils found in common foods

While balancing out your omega-3 and omega-6 fatty acids should always be the first step in beating chronic inflammation, intermittent fasting can play a huge role.

Intermittent fasting has been shown to suppress pro-inflammatory proteins (R) and produce anti-inflammatory gut hormones (R).  This double effect can significantly reduce redness and swelling associated with acne.

This is by far the first thing I noticed when I started intermittent fasting.  A pimple that might drag on for days or weeks at a time could be shut down with a single day intermittent fasting.  You can literally watch throughout the day as a pissed-off, inflamed pimple slowly simmers down and heals itself.

3. Intermittent Fasting Promotes Better Sleep

“Beauty sleep” isn’t just a cliché – sleep is one of the most important factors outside of diet for clear skin.  That’s why it’s no surprise that both sleep deprivation and rates of acne in America are at all-time highs.

  • Sleep deprivation leads to higher levels of the “fight-or-flight” hormone called cortisol.  Cortisol increases insulin resistance, weakens your digestive system, and makes your skin more acne-prone (R)
  • A bad night’s sleep has been shown to increase insulin resistance the next day, further contributing to acne (R)
  • Poor sleep leads to poor immune health and increased inflammatory chemicals that can worsen existing pimples (R)

It’s simple – if you’re not sleeping enough, it’s going to be harder to fight acne.

Sleep deprivation can cause acne

Lucky for us, intermittent fasting is one of the best things you can do to promote healthy sleep.

While things like blue light exposure, exercise, and caffeine have a big effect on your body’s circadian rhythm (the body’s internal “clock”) – it turns out that what and when you eat are also major factors.

Numerous studies have shown that simply shortening the window of time you eat during the day can promote a healthier circadian rhythm:

  • Intermittent fasting enhances the overall effectiveness of circadian rhythm activators (R)
  • Decreasing eating time from 15 hours/day to 11 hours/day improved sleep, decreased body weight, and increased energy during the day (R).
  • Changing when mice ate, not even what they ate, had a significantly positive effect on sleep (R)

Since I started intermittent fasting I’ve found myself falling asleep considerably faster and staying asleep longer.  I wake up a lot more refreshed too, which always helps.

4. Intermittent Fasting Protects You From Free Radicals

You might have heard of free radicals before – pesky little molecules that can cause a lot of stress on the body.  Without enough antioxidants to fight them, free radicals can go from cell to cell causing damage – most notably the oxidation of oil on the skin.  When oil on the skin becomes oxidized, it can easily clog the pore and make it ripe for infection.

Free radicals can be caused by exposure to air pollution or sunlight, overuse of certain acne cleansers like benzoyl peroxide, and even sugar.  They’re everywhere, and if you’re not eating a healthy diet and taking care of your body they can easily cause acne.

Intermittent fasting has been shown to increase oxidative stress resistance (R) and help fight against damage done by free radicals.

The best part?  This increased stress resistance promotes anti-aging and longevity too.

5. Intermittent Fasting Leads to Lower Levels of IGF-1

Insulin-like Growth Factor, or IGF-1, is a growth hormone that triggers the production of new cells throughout the body.  IGF-1 is great if you’re looking to bulk up and gain muscle mass, but it’s a disaster when it comes to acne.

Just like nearly every hormone in the human body, the key to proper levels of IGF-1 is balance – too much IGF-1 and you can increase your risk for certain cancers and develop acne.  Not enough IGF-1 and you can stunt your growth and possibly lower your sex drive.

Explanation of how the hormone IGF-1 causes acne

The problem with IGF-1 is that most of us consume a diet that triggers way too much IGF-1.  With our massive consumption of carbohydrates and dairy products, we see more and more people struggling with IGF-1-related acne as a result.

Intermittent fasting has been shown to reduce levels of IGF-1 while increasing levels of Human Growth Hormone (HGH), a healthy growth hormone that protects muscles and assists with autophagy.

Potential Drawbacks of Intermittent Fasting for Acne

While the pros of intermittent fasting widely outweigh the cons, that’s not to say that intermittent fasting is totally fool-proof.

The largest negative side-effect of intermittent fasting on acne is increased cortisol levels.

Cortisol is your body’s stress hormone.  It’s released whenever your brain thinks it’s in a stressful situation and needs to conserve resources.  Sometimes it’s a real threat (a tiger is about to eat me!) or a perceived threat (I HATE this traffic!). When you fast for prolonged periods of time your body elevates its cortisol levels.

Makes sense, right?  Your body being without food for an extended period of time is sure to be perceived as a stressor, even if you’re doing it by choice (ie: intermittent fasting).

Stress during the Paleolithic era was much less common than stress in modern times

So does this means intermittent fasting is bad for acne?  Well, not quite – just like pretty much every other hormone in your body, cortisol isn’t inherently bad – in fact cortisol can be good for weight loss and increased energy.  Where cortisol becomes a problem is when it’s chronically elevated, meaning you’re constantly in “fight-or-flight” mode.  Cortisol triggers the release of dozens of other hormones that directly cause acne.  That’s why if you’re stressed out all the time, no matter how healthy your diet is, you may still experience acne.

Intermittent fasting likely isn’t going to raise your cortisol levels to this degree, and there are ways around it, like occasionally breaking out of your fasting pattern and eating all day.

That being said, if you’re stressed out, don’t intermittent fast.  Work on decreasing stress first with things like meditation, yoga, or exercise before you jump into intermittent fasting.

Most importantly, listen to your body – are you stressed out when you fast, or do you feel good?

Intermittent Fasting and Your Thyroid

If you’ve read our Guide to Thyroid-Driven Acne, you probably know just how important thyroid health is for acne.

An underactive thyroid can lead to hormonal imbalances, inflammatory acne, and dry, flakey, pale skin.  Without a healthy thyroid, you can’t have healthy skin.

So, what does this have to do with intermittent fasting?  Well, a lot of folks believe that intermittent fasting decreases thyroid function, which leads to acne.

This is not true.

All the research we have suggests that chronic calorie restriction, or constant undereating, leads to an underactive thyroid, not intermittent fasting.  Fasting termporarily decreases thyroid function, but after eating it goes back to normal.  Basically, if your body doesn’t have enough energy from food, your thyroid won’t be able to do its job properly.

You may find yourself eating less and losing weight while intermittent fasting, so just don’t go overboard and your thyroid should be fine.  If you find yourself feeling tired, cold, and weak, it might be time to back off on the fasting and focus on getting your thyroid back in check.

Intermittent Fasting 101

So, you’re ready to jump into the world of intermittent fasting?

Intermittent fasting doesn’t have to be complicated, and there’s a ton of different resources to help you get started.  But before we do that, let me make two quick notes:

Intermittent Fasting Doesn’t Replace a Healthy Diet

Intermittent fasting doesn’t replace the role of a healthy diet in creating clear, beautiful skin.  It’s not an excuse to eat junk food and load up on omega-6’s.  It should be treated as a tool to improve health and build on the existing positive effects of a healthy diet and lifestyle.

If you’re looking for the easiest way to start eating for clear skin, check out the simple one-page GoodGlow Diet Blueprint.

Who Should (and Shouldn’t) Intermittent Fast

One important disclaimer: some people should not intermittent fast.

I’m not a doctor and I don’t pretend to be one.

Seriously, talk to a healthcare professional before taking on intermittent fasting.  Make sure you’re healthy and capable of intermittent fasting before jumping into it.

Furthermore, take it slow.  You don’t need to dive in head first.  Listen to your body, experiment, and tweak.  If intermittent fasting isn’t for you, that’s just fine – don’t force it.

There’s also some evidence that intermittent fasting might not be as healthy for women, and that it may worsen blood sugar control (which can cause acne).  While there aren’t any human studies that confirm this, women should be careful and ease into intermittent fasting.

Lastly, if you suffer from chronic stress or anxiety, intermittent fasting probably isn’t for you.  Intermittent fasting elevates cortisol levels, which can be problematic if you already have high cortisol levels from stress.

Got it?  Great – now let’s jump into the easiest ways to intermittent fast.

Types of Intermittent Fasting

There’s a broad range of intermittent fasting methods out there.  I’m going to cover just a few here, but feel free to experiment and research others:



The easiest and most popular method of intermittent fasting.  You simply don’t eat for 16 hours a day, and then eat for 8.  Here’s an example of what this might look like:

  • 7:00am – Wake up, skip breakfast
  • 11:00am – Eat lunch
  • 1:30pm – Snack #1
  • 4:00pm – Snack #2
  • 7:00pm – Dinner

The exact hours you fast doesn’t technically matter.  You could skip dinner if you wanted to or eat your first meal at 1pm.

16/8 is a really easy strategy to follow, and skipping breakfast can actually add a huge amount of simplicity into your day.

5:2 methodCalendar with clock

This is a little bit trickier and requires you to restrict yourself to 500-600 calories two days a week (with at least one day in-between the fasts).  For example:

  • Monday – Eat normally
  • Tuesday – Eat normally
  • Wednesday – Eat 500-600 calories
  • Thursday – Eat normally
  • Friday – Eat normally
  • Saturday – Eat 500-600 calories
  • Sunday – Eat normally


24 hours

This method involves a simple 24-hour no calorie fast once or twice a week.  A 24-hour fast can be pretty tricky to pull off, so for many people this option isn’t viable, but if you can muscle it, the benefits can be worth it.

Many of the benefits that come from autophagy, the process where your body recycles old protein for energy, begins at 24 hours.

One-Meal-A-Day (OMAD)Big meal

OMAD is exactly what it sounds like – you eat one meal a day.  It might sound crazy, but many experts argue this is likely the most similar eating pattern to our ancestors.

OMAD can simplify your day, jump-start weight loss, and increase autophagy – a process where your cells recycle old, damaged proteins and replace them with new, healthy cells.

Fat Fasting

This is actually the form of intermittent fasting I used to get my acne under control while trying to gain weight and muscle.

Coconut oil

Fat fasting (sometimes called “Bulletproof” intermittent fasting) involves a 16 to 20 hour modified fast, followed by a 4 to 8-hour eating window of clean, healthy foods.  The reason I say “modified fast” is because in the morning, instead of consuming breakfast, you consume a zero-carb, zero-protein drink, like Bulletproof Coffee.  Bulletproof Coffee is just coffee with grass-fed ghee butter and extra-virgin coconut oil in it.  It tastes great, and because it’s purely fats, the insulin response is next to zero, and it shouldn’t affect autophagy much.

Bulletproof coffee allows me to extend my fasts upwards of 21 hours without feeling hunger.  I still get close to the maximum positive effects on insulin resistance while still consuming enough calories to get through the day.  If you’re struggling getting started with intermittent fasting, I’d highly recommend you try fat fasting.

The Best Intermittent Fasting Method For Clear Skin

In the same sense that there is no “best” diet for clear skin, there is no “best” method of intermittent fasting either.  Every person’s genetics, dietary needs, and personal preferences vary, and what may work for one person might not work for another.

Most beginners find the 16/8 method doable and the skin-clearing benefits to be significant, but remember to implement it after you have your diet under control.

There are a few tweaks you can make to any intermittent fasting routine to make it more effective for fighting acne:

  • Don’t break a fast with carbs – Save your carb-heavy meals for dinner.  Carbs are bound to spike your insulin levels, so if you can consume them at night and in one sitting you’ll have fewer carb cravings.  Plus you can ride that post-carb high right into a great night’s sleep
  • Carb Quality Matters – The carbs you consume are the largest determining factor behind insulin levels.  While intermittent fasting, it can be tempting to break a fast with a pizza.  Try to stick to skin-friendly starches like sweet potatoes or white rice instead of bread or pasta
  • See if you can hit some 20+ hour fasts – Studies have shown that the sweet spot for lowering insulin levels happens between the 18-21 hour mark.  16 hours is great, but if one day a week you can push through to 20+ hours your skin will thank you for it

Above all else listen to your body and your skin – Intermittent fasting isn’t for everyone, and for some people the stress of intermittent fasting can cause acne.  If you’re not feeling it, don’t do it.  You don’t need to fast to eliminate acne.  Focus on your diet, exercise, and reduce stress.


Intermittent fasting can be one of the most powerful tools possible for tackling the root causes of acne.  It can limit inflammation, decrease insulin resistance, and fight free radicals.  In addition to its skin-clearing benefits, intermittent fasting has a host of positive health effects from anti-aging to decreasing the risk of certain cancers.  I personally feel more focused, energized, and calm when I utilize intermittent fasting – not to mention my skin dramatically improves when I incorporate it into my daily life.

But intermittent fasting is only as powerful as the diet that it’s combined with.

If you neglect your diet and consume too much omega-6’s, splurge on carbs, or consume lectin-filled foods, intermittent fasting won’t clear your acne.  If you have a clean diet and seem to be stuck after your initial improvement, intermittent fasting might just be the tactic you need to break through and achieve the skin you’re looking for.

If you’re looking for a starter guide to achieving clear skin through diet, download the free Good Glow Diet Blueprint.  It has everything you need to get started eating a diet for clear skin, all on one page.

Diet Blueprint Thumbnail@2x


Everything you need to start eating an acne-free diet, all on one page.  Get permanently clear skin from within.

  • Quick, simple, understandable
  • The best foods to eat for clear skin
  • The foods you need to avoid

8 thoughts on “The Ultimate Guide to Intermittent Fasting for Acne

  1. Great stuff. But what about when you already eat a very low insulin triggering diet? I eat no carbs at all, just vegg, fats and protein. Will I still benefit?

    • Hi Luc!

      Thanks for the support and great question!

      A low-carb or ketogenic diet like the one you’re describing will get you many of the same benefits of intermittent fasting:

      • Lower insulin resistance
      • Decreased inflammation
      • Lower levels of IGF-1

      All and all, those are some pretty awesome benefits.

      What will you miss out on from not intermittent fasting?

      • Autophagy is a big one – it’s a process where your body runs out of food to burn for fuel, so it actually goes out and uses old, damaged protein cells as energy. This can have a profound effect on acne.
      • Increased oxidative stress resistance and the potential for better sleep are other benefits of intermittent fasting, but not something that you can’t live without.
      • Intermittent fasting will likely amplify the insulin and inflammation-minimizing effects of a ketogenic diet, so if you’re struggling with acne after going low-carb intermittent fasting may help in that regard.

      Overall, a lower-carb diet is a huge step in the right direction. If you can tack on intermittent fasting, you’ll get more even more benefits, and for many people on a low-carb diet, intermittent fasting comes pretty easily.

  2. Male, 32 here. 4th week into 18:6, feeling absolutely great and energetic. However, my somewhat controllable acne just went out of control bad. It’s like I’m 17 again. Don’t raised levels of growth hormone aggravate the skin? Or is this just a phase?? About to jump off the IF-wagon if acne keeps being this bad…advise very welcome

    • Hey Tim!

      Really sorry I haven’t got back to you on this! Did you end up sticking with IF? Did your skin improve at all?

      While it’s true that growth hormone generally promotes more production of testosterone and other male hormones that can cause acne, it also lowers several hormones (IGF-1) that can improve acne. This is a delicate hormonal balance that can vary from individual to individual.

      It’s also worth noting that high levels of human growth hormone and testosterone are only one component of the acne creation process. Yes, these hormones will result in more sebum oil being created, but an acne-friendly diet, like I outline in the GoodGlow Diet Blueprint, is a great way to make sure this excess skin oil doesn’t end up clogging pores or get infected.

      I don’t know about your particular case, but when I first went with IF I noticed my skin got a fair amount worse before it got better. Once my body got used to it and autophagy and fat adaptation started kicking in, I had much less inflammatory acne. I am happy I stuck with it, as intermittent and prolonged fasting are one of the most valuable things I have to fight against acne.

  3. This is so popular nowadays and said on being effective. Also mind your food intake to lower cholesterol levels for a more effective fasting.

  4. Pingback: Drink From The Fountain Of Youth With Fasting - Fasting Hacker
  5. Thanks for great sharing;

    I’m 33 and with IF I believe I got believe benefits in 4 weeks;

    -less acne and oily skin (I started to get acne after 19 and I have many scars)
    -my hair is somewhat thickened
    -my guts are relaxed
    -I feel more energetic and happier

  6. Thank you for putting in the time and resources to put this website together. It’s been very helpful and encouraging to me as I have recently realized that diet plays a huge role in my skin problems. I went on a course of accutane but relapsed after a while. I’ve since been working on changing my diet and it has worked somewhat but it’s difficult to know what exactly to eat and what to avoid due to the large number of conflicting information online regarding acne friendly and acne causing foods. I hope you can get back to posting soon and look forward to future content.

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