what can i drink on intermittent fasting
Intermittent Fasting

What Can I Drink While Intermittent Fasting? [Clean vs. Dirty Fasting For Weight Loss]

drink while intermediate fastingIf you’ve tried intermittent fasting for any length of time, you’ve probably wondered one very important question.

“What can I drink while intermittent fasting”?

Some sources say anything with fewer than 25 calories or so (though zero is ideal) is fair game.

Others say you must be stricter than that – keeping it to a few select beverages other than water.

With so much conflicting information between scientific studies and personal anecdotes, how do you discover the truth?

How do you know what beverages you can drink while intermittent fasting?

In this post I’ll answer that question in three parts.

First, we’ll discuss different schools of thought on either side of the argument.

Then, I’ll share a few thoughts based on my own results.

Finally, I’ll help you decide what might be the best approach for your unique situation and personal goals.

Let’s dig in.

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What Is Intermittent Fasting?

intermittent fasting one year

Just in case you don’t yet know, intermittent fasting has grown in popularity in recent years as a quick, easy way to lose weight.

Rather than restricting what you eat via strict dieting, with intermittent fasting, you get to eat a full meal once or twice a day, to satiety, including foods your truly enjoy (yes, even ice cream)!

All you do is select a “fasting window”, during which time you consume no calories, and a “feasting window”, during which time you eat all your food for the day.

While there is a variety of intermittent fasting schedules to choose from, the most popular is 16:8 intermittent fasting.

On such a plan, you’d fast for 16 hours each day and feast for 8 hours.

Most people on the 16:8 fasting diet plan stop eating after dinner around 8 pm, sleep through the night, skip breakfast the next day, then eat lunch around noon the following day.

Sounds doable, right?

Not so fast.

While it’s pretty obvious that you can eat nothing while fasting, what about drinking?


What Can I Drink While 16:8 Fasting? [Clean Fasting vs. Dirty Fasting]

what can i drink on intermittent fasting

Here’s where the dirty fasting debate begins.

Keeping it super-simple, while intermittent fasting you should drink calorie-free, flavorless beverages.

This includes unflavored water, unsweetened tea, and black coffee. That’s it.

If you follow these guidelines, you are “clean fasting”.

But if your goal of intermittent fasting is calorie restriction and weight loss, can you have zero-calorie artificial sweeteners? Or a splash of milk or creamer in your coffee, for taste? 

This would be “dirty fasting”, and opinions on whether or not that will break your fast are mixed.


Clean Fasting vs. Dirty Fasting – What’s The Big Deal?

intermittent fasting 16/8 one year results

Before we go any further with the debate between clean and dirty fasting for weight loss, we much acknowledge a very important fact:

Calorie restriction isn’t the only way intermittent fasting helps with weight loss


How Does Intermittent Fasting Help With Weight Loss?

intermittent fasting 1 year

It’s obvious that consuming fewer calories is likely to help you lose weight.

And, it’s a lot easier to restrict calorie consumption if you’re only eating for 8 hours of the day instead of around the clock, right?

I mean, while it’s still possible to overeat in fewer hours, it is far less likely.

But there is another way intermittent fasting helps to lose weight – by eliminating anything that may create an insulin response.


Insulin Response And Weight Gain

belly bloat cure

Many people believe that zero-calorie artificial sweeteners are okay for fasting and weight loss because technically zero calories is still fasting.

But studies have shown that even the taste of something sweet – whether it has calories or not – is enough to make your body think you are having sugar.

In preparation for breaking down the incoming “sugar”, the body releases insulin, which helps your cells absorb glucose (sugar).

But when the body actually has no sugar for the insulin to work with, two adverse effects arise.

First, your blood sugar drops, thus increasing hunger and cravings – making it harder for you to continue your fast.

And second, insulin sends a signal to your body to stop using fat for energy, and to use glucose instead.

So, while the actual calories in artificial sweeteners may be zero and you technically aren’t breaking your fast – some of these sweeteners may be blocking you from achieving the results you desire.


Some Items May Not Trigger An Insulin Response

intermittent fasting caffeine energy

Given this information, it seems like it would be totally impossible to lose weight with dirty fasting at all, right?

Not really.

Not all artificial sweeteners are created equal.

And not every dirty fast even includes sweeteners.

Research on artificial sweeteners and insulin response isn’t as robust as we’d like at this point, but a few studies have yielded interesting results:


-Powdered sucralose (like Splenda) spikes insulin, but liquid sucralose may not

-Erythritol-based sweeteners (such as Swerve) may not spike insulin

Stevia may also not spike insulin


Furthermore, artificial sweeteners are not the only way some people prefer dirty fasting.

What about adding a little creamer to your coffee?


Will Creamer In My Coffee Break My Fast?

intermediate fasting weight loss two week transformation

This is where things seem a little backwards. Where there are zero calories in artificial sweeteners, (thus making them technically fasting-friendly), many will negate the benefits of your fast. Whereas creamer does contain calories and technically means you’re no longer fasting.

But a little creamer (say a tablespoon or so) doesn’t spike insulin and doesn’t really have adverse effects on weight loss.

Even Dr. Jason Fung, author of the top fasting books, The Obesity Code and The Complete Guide to Fasting, says he uses cream in his coffee and it doesn’t stop him from reaching his goals.


Clean Fasting vs. Dirty Fasting – What Counts?

2 week fitness fasting transformation

This isn’t an exhaustive list by any means but is meant to help you wrap your mind around what qualifies as clean fasting and dirty fasting.

For the most part, anything other than water, unsweetened tea or black coffee is dirty fasting. And it’s questionable as to which items labeled “dirty fasting” will actually break your fast.

But as a quick and dirty rule (no pun intended), here’s what you can use.


Clean Fasting: Water, Unsweetened Tea, Black Coffee

Dirty Fasting: 1tbsp or so of creamer, some artificial sweeteners (liquid sucralose or Swerve), apple cider vinegar


How I Approach Clean vs. Dirty Fasting

1 year intermittent fasting before and after

Briefly, I’ll share my personal thoughts and approach to dirty fasting.

When I first tried intermittent fasting back in May 2018, I had no clue what clean or dirty fasting was.

Honestly, I don’t even think it was a thing back then, really. It seems to be a new-ish concept.

Anyway, I have a huge love of carbonated, zero-calorie energy drinks.

And while I can tolerate my coffee black, it’s not my preference.

That said, I drank black coffee some of the time, while other times would drink a sugar-free energy drink, and I still lost ten pounds my first month 16:8 intermittent fasting.

The second time I tried fasting just 12 hours a day and lost even more weight with a cleaner diet, but I still dirty fasted (again, without knowing what dirty fasting was).

I only recently learned of the insulin resistance part of dirty fasting.

So, this whole time I’ve just used intermittent fasting for calorie reduction and honestly? It’s been perfectly fine!

BUT… I also believe in considering new and useful information when I discover it.

As such, I feel two ways about this.


Two Viewpoints On Dirty Fasting

one year intermittent fasting pictures

If you’re losing weight while dirty fasting, should you aim for even better results by moving to clean fasting?

Or… if you’re overweight or obese because you have a hard time sticking to complicated, over-limiting diets that suck all the joy out of your life – and wind up relapsing or quitting altogether – are you better off with a moderate plan that you can actually live with?

Since I like experimenting, I’m going to give clean fasting a try and see what I think.

But for now, I have to say I love the simplicity (and actual flavor in my coffee and tea) while continuing to lose weight.


Should You Clean Or Dirty Fast?

woman considering clean vs dirty fasting

So, now that you know what clean and dirty fasting are all about, how can you tell which option you should go with?

I believe the answer lies in a combination of factors.

First, you should consider what you’ve already tried and how you feel about it.

-If you’ve been dirty fasting and aren’t losing weight? Maybe you should try to clean up your fast and see if that helps.

-If you’ve been dirty fasting and it’s working well for you – it fits your lifestyle and you feel comfortable enough to where you can stick with this for the long-haul? Maybe you’re fine with keeping it at dirty fasting.

-If you’re clean fasting and the weight is coming off, yet you’re totally miserable with such bland beverages. And you feel like you might not be able to commit to it long-term for this very reason? Maybe you can try adding a little creamer or sweetener in your coffee or tea, then check your weight over the next few weeks to see if it stalls you out any.

-If you’re clean fasting and the weight isn’t coming off? See what other reason you have for not losing weight on intermittent fasting. If it’s something like you’re not fasting long enough, and this could be because you just can’t hack black coffee and water, maybe adding a little creamer or flavor can get you over the hump to where you’re fasting long enough to make a difference.

-If you’re brand new to intermittent fasting and want to know how best to start out? Try clean! Try doing it absolutely perfectly and see how it feels! You may find it to be not so bad, and it’s a great idea to give yourself the highest chance of success at the outset.

I’d have started with clean fasting had I really known much about it at the time, honestly.

It just so happens I had success the other way and rolled with that.


Don’t Listen To The Naysayers

intermittent fasting not working

One last thing.

It seems like with weight loss people get really passionate and almost cult-like about their beliefs and choices.

During my stint with the ketogenic diet, I saw this play out full-force in various forums and subreddits.

And oh, boy!

People go on full out flame wars behind what you should do and what’s best and what’s right or wrong.

At the end of the day? None of it matters!

The only thing that matters is that you’re taking active steps to improve your life and reach your goals.

That you’re willing to pay attention to what your body is telling you, and make tweaks and improvements where need-be.

And that YOU are happy with YOUR dietary choices!


Different Strokes For Different Folks

woman drinking water

Some people thrive on dirty fasting, while others can’t lose a pound.

Some people feel like black coffee is tolerable and find it easy breezy, while others really hate it and would fall off altogether if they were forced into it.

So what if it’s not “right”?

So what if it “breaks your fast”.

If you’re losing the weight you desire, and you feel good about yourself and your progress, that’s all that really matters.

You are your own best teacher. The sooner you realize that, the better off you’ll be!


What Kind Of Faster Are You?

woman holding a clock

So, given all we’ve covered and discussed, what kind of faster are you? Clean, or dirty?

Happy fasting!


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What Can I Drink While Intermittent Fasting: Clean fasting vs Dirty fasting is becoming a hot topic in intermittent fasting 16/8 fasting, intermediate fasting circles. If you want to lose weight intermittent fasting and get good before and after intermittent fasting weight loss results, here's the skinny on dirty fasting and what's safe to drink while intermittent fasting.