By Melissa Urban

Curious about kombucha? Read on for an explanation of this popular fermented beverage. If you are looking for a Whole30 Approved kombucha option, check out our collaboration with Humm Kombucha.

Kombucha—a fermented tea—is a delicious beverage that may add some probiotic benefits to your already healthy Whole30 diet. But “Is kombucha Whole30-compatible?” isn’t the easiest question to answer.  This article is designed to give you an insider’s look into the thought process behind the Whole30 rules, and explain a bit about why this subject is actually legitimately confusing.

It’s not just you. It was confusing for me too. I’ll do my best to explain.

Kombucha Basics

Kombucha is a fermented tea dating back 2,000 years, to ancient China. It requires tea, sugar, and an active starter culture of bacteria and yeast (called a SCOBY)*. You start with a black or green tea, then add spring water, your SCOBY (Symbiotic Culture of Bacteria and Yeast), and cane sugar. You then cover it, store it, and allow it to ferment for 7-30 days, to taste. (The longer it ferments, the more sour it becomes.)

*Note, there are many kombucha recipes and techniques out there. There is no one “right” way; it’s all based on personal preference. I’m just giving you the very basics here as an example.

But SUGAR is not Whole30!

Added sugar of any sort is not permitted on the Whole30, true. But in this case, the sugar isn’t added to the product after the fact, it’s used in the beginning to feed the SCOBY. That’s how it ferments. Sugar is a necessary part of this fermentation process.

Does ALL the sugar get “eaten up”?

Well, no, that’s actually a myth. Some sugar remains, depending on how long you ferment. The longer you ferment, the less sugar is left.

ASIDE: Doesn’t kombucha contain alcohol, and isn’t that a no-no too?

Well, yes. But again, alcohol isn’t added to the product, it’s a natural byproduct of fermentation. Most things with a high sugar content (fruit, fruit juices) have bacteria that, through fermentation, produce ethanoleven orange juice! This natural fermentation by-product is not implied in the Whole30 rules, so in this article, we’re just going to focus on the sugar. 

What about store-bought kombucha, like GTs? Is there sugar in that too?

Yeah, so this is where it gets really Whole30-tricky.

The Whole30 Rules vs. Application

The Whole30 rules say, “No added sugar; if there is any form of sugar on the ingredient list, it’s out.” This makes the program really easy to follow—just read your labels, and if you see any form of sugar listed with the other ingredients, put it back on the shelf.

The trouble is, kombucha labeling isn’t as tightly regulated as other food labeling. That’s because it’s controlled by the FDA, not the USDA. This is why some kombucha brands list sugar in their ingredients, while others do not.

Let me be clear—ALL kombucha uses some form of sugar in the fermentation process. Sometimes the sugar is in the form of a traditional sugar, like white or cane sugar, and sometimes (like in the case of our Whole30 Approved collaboration with Humm) it is in the form of fruit juice.

Because of this, some brands who use a traditional form of sugar note that usage in their ingredient list, others do not. This means if you’re browsing kombucha at Whole Foods, anything that says “sugar” in the ingredient label (even if the sugar is used in the fermentation) you’ll have to put back on the shelf, as it’s out for the duration of your Whole30. I like the fact that these brands are transparent, but because we need the Whole30 program to be as easy to follow as possible, it’s out for your Whole30. This kind of sucks.

Other brands don’t include sugar used in the fermentation process on their ingredient label. This makes the label Whole30 compatible, and means you can drink it during your Whole30.

Confusing? It can be. That’s why we’re excited about the Whole30 Approved varieties of Humm kombucha, as it takes all of the guesswork out of choosing a compatible kombucha. If it has our Whole30 Approved logo on it, it’s compatible.

*Still other brands of kombucha use sugar in the fermentation process, AND add sweetener after the fact. This rules it out for the program, because if you look at the ingredient list, you’ll see “stevia.” This part isn’t tricky. They add sweetener to the finished product to make it sweeter. It’s out.

The Place Where It Gets Tricky

Is this fair? No. Many kombucha brands that do include sugar on their labeling are just as healthy and high-quality as those who do not. So why can’t you drink them during your Whole30?

Because rules.

One of the key elements of the Whole30, and part of what makes it so incredibly effective for nearly everyone who completes it, is that the rules are black-and-white and easy to follow. This takes much of the decision-making process out of “effort” territory in the brain, and into “automatic” territory, where habits are formed. Is there sugar in the ingredients? It’s a “yes” or “no” answer; no willpower or executive function required. These kinds of black-and-white rules are a huge element of the Whole30’s habit-research-based approach.

Now imagine the Whole30 rules weren’t so black and white here. If I said, “No added sugar, but added sugar in kombucha is okay because even though there is sugar in the ingredients, it’s used by the SCOBY, as with many fermented goods, but not all kombucha is okay because sometimes they add sugar after, and you’re going to have to figure that out for yourself.” Can you imagine me trying to communicate the message of sugar and fermentation the SCOBY and FDA labeling regulations to millions of Whole30’ers, such that they all understood why one kombucha was okay but these others are not?

There is no way I could do that. No way.

So I rely on the black-and-white rules. If there is sugar on the label, it’s out. Period.  Is this fair? No. Is it the best way I know to implement the Whole30 rules? Yes.

Now… if you can drink some brands of kombucha because of their labeling practices, how can I say, “This kombucha is okay, but you can’t make your own kombucha at home, because you’re adding sugar?”

I can’t. Which means there’s a loophole here in the strictest sense of the Whole30 rules.

If you’ve followed along thus far, you can see how managing the Whole30 program can be complicated at times. Please know I’m doing the best I can. I have to make the rules easy to follow, and in the case of kombucha, it’s the FDA’s laxity in labeling laws that is making my job hard. And I guarantee I’ll be criticized no matter what I do, so I’m going to stick to my guns and make the call that I think is in the best interest of the program, and your results.

The Final Word

If you make kombucha at home and don’t add sugar after the fermentation process, is that Whole30-compatible? Yes.

If you buy store-bought kombucha and sugar is not in the ingredient list, is that Whole30-compatible? Yes.

If you buy store-bought kombucha and sugar is not in the ingredient list, but you do see fruit juice, is that Whole30-compatible? Yes.

If you see store-bought kombucha and see any form of sugar (including stevia) in the ingredients, is that compatible? No.

Resources for Homemade Kombucha

Guest blogger Lisa McLeod will be giving you a recipe for homemade kombucha on the @Whole30Recipes Instagram feed later this week (search for #whole30homemadekombucha on Instagram), for those of you interested in trying your hand at at-home fermentation.

You can also take Sarah Ramsden’s online Fearless Fermentation course, which walks you through step-by-step how to make your own kombucha, sauerkraut, water kefir, and fermented vegetables.

If you have follow-up questions, please visit this post on our Instagram or Facebook page. Thanks for taking the time to read. I hope this makes it abundantly clear how much we all want to see you succeed with the program, and the lengths we’ll go to do our research to make sure you get there.

Melissa, and the Whole30 team


3-15a small

Melissa Hartwig is a Certified Sports Nutritionist, and the author of the New York Times bestselling books It Starts With Food and The Whole30: The 30-Day Guide to Total Health and Food Freedom; and the upcoming Food Freedom Forever and The Whole30 Cookbook. She has been featured in the Wall Street Journal, New York Times, Details, Outside, SELF, and Shape as the co-founder of the Whole30 program. Melissa lives in Salt Lake City, UT.

Photo credit: Marie Carmel Photography