Last Updated on January 28, 2023 by Lori Geurin
When I first started intermittent fasting (IF), I’d never heard of clean fasting. I dove in headfirst and eventually learned that not all fasting is created equal. Gin Stephens says that clean intermittent fasting is the only kind of fasting, and after years of practicing IF, I agree.
So, what is clean fasting? Simply put, it’s avoiding any type of food or drink (other than water, sparkling water, black coffee, and unsweetened tea) during your fasting period. That means no calorie-containing beverages, bone broth, no foods, and no snacks.
Wondering how to do a clean fast? In this post, you’ll learn all about clean fasting and dirty fasting, plus the benefits and stages of fasting.
Intermittent fasting has been around for ages but has gained popularity recently. From weight lifters to those with chronic illnesses, many have discovered the power of fasting to improve their health, lose weight and reverse and prevent diseases.
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I’ve been intermittent fasting for a few years and have experienced so many health benefits. In the past few months, I’ve tested the effects of clean and dirty fasting. Below I’ll share what I’ve learned using myself as a guinea pig. Hopefully, the results of my experiment will help you get the most out of your intermittent fasting journey!
- What Is Clean Fasting?
- Clean Fasting Foods / Clean Fasting Drinks
- How Do You Like Your Coffee?
- What Is Dirty Intermittent Fasting?
- Dirty Fasting Foods / Dirty Intermittent Fasting Drinks
- My Clean Fasting Vs. Dirty Fasting Experiment
- The Results And What I Learned…
- Benefits Of Intermittent Fasting
- The 5 Stages Of Fasting
- Summary – Clean Fasting Vs. Dirty Fasting
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What Is Clean Fasting?
Clean Intermittent Fasting Rules
So, what is a clean fast? When I started intermittent fasting years ago, I’d never heard of clean or dirty fasting. But learning how to utilize clean fasting has improved my fasting game immensely.
Clean fasting creates the ideal fasting environment – one without any insulin spikes.
And one of the most significant benefits of clean fasting is that it makes your body a fat-burning machine. In truth, clean fasting is the way to go if you want to see the most success in your fasting efforts.
It includes only unsweetened, calorie-free beverages. But keep reading for all the details!
Clean Fasting Foods / Clean Fasting Drinks
Wondering what clean fasting foods are? Well, I’m going to list them for you here. Below are the only foods and/or drinks proven safe to include during your clean fast.
This means that they won’t spike your insulin, and they’ll keep your fat-burning in overdrive, which is ultimately what you want.
- Black coffee
- Unflavored water
- Sparkling water, mineral water, and club soda
- Unsweetened teas (not fruit-flavored) – include herbal teas, green tea, and black tea
- Salt and electrolytes
- Medications prescribed by your doctor
Get our intermittent fasting how-to guide to learn all about IF!
How Do You Like Your Coffee?
In America, many of us add so many creamers and sweeteners to our coffee that it hardly resembles actual coffee. In fact, I’ve met people who say they hate the taste of black coffee, but they “love drinking coffee.”
I’m not here to tell you that you can’t put anything in your coffee if you want to, because sometimes I enjoy a little cream or coffee drink myself. But, if you want to improve your intermittent fasting results and are a coffee drinker, you must consider drinking black coffee.
What is black coffee?
It’s simply coffee with nothing else added—no creamers, sweeteners, etc.
I’ll admit that after years of drinking coffee with creamers and sugar, going cold turkey and drinking black coffee was a jolt to my system. Last year, on January 1, I set a goal to cut out all coffee creamers for the year. (With a couple of minor exceptions) I met my goal.
Doing this taught me that I could enjoy my coffee black. So if you’re wondering how to start drinking black coffee, set a goal for yourself, then go for it!
Right now, I’m doing black coffee Monday through Friday, and I’m enjoying a natural almond milk coffee creamer on the weekends. I’ve found that you have to make your fasting practice fit your lifestyle.
So, learn what works best for you and do that.
Need some inspiration for your fasting lifestyle? Get 42 powerful intermittent fasting quotes to motivate you.
Learn about the intermittent fasting types.
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What Is Dirty Intermittent Fasting?
Dirty fasting is when you consume foods or beverages that break your fast. Many experts will tell you dirty intermittent fasting is fine. And to be honest, I didn’t know there was a difference for years because much of what I read said you were still fasting as long as you keep your calories under 100 during your fasting window.
I would have my bulletproof coffee most mornings and still experienced the benefits of fasting, including better mental clarity, improved energy, complete elimination of my reactive hypoglycemia, and effortless weight loss of 20+ pounds.
But once I started practicing clean fasting, I experienced a noticeable boost in benefits and additional weight loss (bringing my total weight loss to 35+ pounds). So, if you’re fasting for weight loss and haven’t lost anything for a while, I’d recommend clean fasting for the best results.
Try it for a couple of weeks and see what you notice.
(Check out the complete guide to fasting here.)
Dirty Fasting Foods / Dirty Intermittent Fasting Drinks
Technically any food will break your fast, but the ones listed below are commonly referred to as dirty fasting foods.
They’re well-known culprits that people often add to their clean fasting foods that will spike your insulin and stall your weight loss, especially if you consume them daily, even in small amounts.
Here are the dirty intermittent fasting foods and drinks:
- Coffee creamer
- Flavored coffees
- Flavored water
- Sweet or fruity teas
- Almond milk or other plant-based milk
- Artificial and natural sweeteners
- Lemon slices
- Collagen powder
- Protein powder
- Bone broth
- Coconut oil, MCT oil, and butter
- Sugar-free sodas
- Sugar-free breath mints
- Sports drinks
- Some nutritional supplements are sometimes okay, depending on what they are, but it’s usually best to avoid them entirely within the fasting window, if possible.
- Supplements including exogenous ketones, collagen, and BCAAs
- Sugarless chewing gum
Now for an experiment…
My Clean Fasting Vs. Dirty Fasting Experiment
First of all, I’ll offer up this disclaimer to anyone interested: I’m not a scientist, and I don’t play one on T.V. I’m just a girl who loves intermittent fasting and occasionally geeks out over research, facts, and figures that might be helpful to others. Take this information with a grain of salt. The only test subject was me. However, this fact does not make the results any less compelling.
My experiment was straightforward and conducted for a couple of weeks. When comparing the results of clean and dirty fasting, I looked specifically at:
- my symptom relief and the benefits of fasting
- my ketone levels (how quickly I got into ketosis with fasting alone, not via a keto eating plan) or level of fat-burning
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Now to the good stuff.
The Results And What I Learned…
- Symptom relief and benefits of fasting – With clean fasting, the benefits I’d already experienced (with the prior dirty fasting) were heightened. I felt even more clear-headed, had better energy (something I continue to struggle with due to chronic Lyme), and felt no hunger. My brain was sharp, and I was more efficient. My body saw the fasting benefits of autophagy, the recycling of old cells.
- I used an intermittent fasting app to track my fasting time accurately and measured my ketone levels in the afternoon before breaking my fast using these Keto Strips. On the days I did clean fasting, I entered ketosis earlier in the day and was in deep ketosis, as shown by the deep purple color on the Keto Strips. If I entered ketosis on the dirty fasting days, it was always in the trace to small ketone amounts. This showed me that clean fasting put me in fat-burning mode faster and at a deeper level than dirty fasting.
Now let’s take a closer look at how fasting can help you.
Benefits Of Intermittent Fasting
Here are some of the impressive benefits of fasting.
- Improves weight loss
- Increases belly fat loss
- Regulates hormones
- Repairs cells through a process called autophagy
- Lowers your risk of type 2 diabetes
- Increases longevity
- Reduces LDL cholesterol and triglycerides
- May help prevent cancer
- May help prevent neurodegenerative diseases, including Alzheimer’s and Parkinson’s
If you’d like to learn more about the benefits of fasting, check out 9 Health Benefits Of Intermittent Fasting.
The 5 Stages Of Fasting
According to lifeapps.io, the creators of the LIFE Fasting Tracker app, there are five main stages, or phases, of intermittent and prolonged fasting:
- Ketosis and heavy ketosis – This happens after 12 hours when your body starts breaking down body fat.
- Autophagy – By 24 hours, your body is recycling old, worn-out cells like nobody’s business! Out with the old junk and in with new (rejuvenated) cells and tissues. Renewing your body is what autophagy does best.
- Growth hormone – After 48 hours, your growth hormone level has risen by five times.
- Insulin decrease – At 54 hours, your body is becoming more insulin-resistant.
- Immune cell rejuvenation – By 72 hours, your body is busy breaking down old immune cells and building up new ones.
Summary – Clean Fasting Vs. Dirty Fasting
I hope you enjoyed reading about my experiment with clean and dirty fasting. Hopefully, this information will help you on your fasting journey, especially if you want to lose weight and feel better.
Knowing the difference between clean and dirty fasting foods and drinks is crucial to gain optimal results from your fasting efforts. With this knowledge, you can achieve your health and weight loss goals.
The intermittent fasting lifestyle has given me so much freedom in life. One of the things I love most is that my focus is no longer on restricting certain foods but on living a healthier life and feeding my body what it needs in my feeding window.
I spent hours a day thinking about food, craving sweets and carbs, and eating to prevent another hypoglycemic episode. It was as though my life revolved around food…out of necessity.
But no more – thanks to fasting!
(Here are 50 things to do instead of eating when you’re intermittent fasting.)
Thankfully, now that I’ve discovered fasting, I’m not a slave to my next meal (or the scale). My body is healing and healthier, and I’m grateful for this natural practice that I plan to continue for the rest of my life.
For More Intermittent Fasting Articles, You’re Gonna Love:
- Intermittent Fasting: The Effortless Way To Lose Weight
- Top 7 Myths About Fasting Debunked
- Intermittent Fasting Nutrition: What To Eat For Maximum Results
- Intermittent Fasting Workout: Benefits Of Exercising In a Fasted State
- How Intermittent Fasting Cured My Hypoglycemia
- OMAD Health Benefits And Precautions
What are your thoughts about clean and dirty fasting? Any questions about fasting?