Kombucha is fermented tea, and soda is carbonated water with added sugar and flavorings. Kombucha usually has less sugar per glass, but it is not a free pass. Some bottles come close to a soft drink, and its acidity can be as hard on tooth enamel as soda’s. The honest answer is that kombucha is a reasonable everyday swap if you read the label, and a treat in its own right if you don’t. Below you will find the numbers, a label-reading method and a pairing idea for a dessert-style bite like our Red Velvet Heart Waffles.

TL;DR

• Kombucha is brewed from sweetened tea and fermented. Soda is made fizzy with injected CO₂ and sweetened directly.
• A typical 8-ounce (about 237 ml) serving of kombucha has roughly 2 to 8 g of sugar and about 30 calories, according to Time’s review of the data. Always check the specific bottle.
• Kombucha is acidic, and so is soda. Rinse with water after a drink and avoid sipping it slowly all afternoon.
• Health claims about kombucha are mostly unproven. Treat it as a lower-sugar, flavorful drink, not as medicine.
• Compare labels per 100 ml, and look at both total sugars and added sugars.

Table of Contents

• What actually separates kombucha from soda
• Sugar and calories: the number everyone wants
• Caffeine, acidity and teeth
• So is kombucha healthier than soda?
• Kombucha vs soda vs water kefir at a glance
• How to choose well
• Pairing a drink with a red velvet waffle
• Perspective
• Order the waffle, build the rest around it
• FAQ
• Sources

What actually separates kombucha from soda

The difference starts in the kitchen, not on the label.

Soda is built. Water is carbonated, then sugar or sweeteners, flavorings and often preservatives are added. The fizz comes from carbon dioxide injected under pressure.

Kombucha is grown. According to a 2023 review in the journal Foods, it is made from sweetened black tea (around 70 to 90 g of sugar per liter at the start) and a SCOBY, a symbiotic culture of bacteria and yeast, fermented for about 7 to 10 days. The microbes consume much of the sugar and produce organic acids and a little carbon dioxide. That is where the tang and the natural fizz come from.

A second difference is the “probiotic” question. The Mayo Clinic Press notes that kefir and kombucha are rich in probiotics, while sodas may have probiotics added but are not fermented, and it is unclear how many of those added bacteria survive stomach acid. So a drink labeled “probiotic soda” is a different product from kombucha, even if the can looks similar.

One caution on live cultures: not every bottle on a shelf still has them. Pasteurized kombucha has been heat treated, which reduces live microbes. If live cultures matter to you, look for the words “raw” or “unpasteurized” and keep the bottle chilled.

Sugar and calories: the number everyone wants

The usual pitch is that kombucha has far less sugar than soda. It often does, but the range is wide.

The figures in the research for kombucha are:

• About 30 calories and 2 to 8 g of sugar per 8-ounce serving, citing the USDA food database.
• A broader range of 3 to 15 g of sugar, according to Health.com, which shows how much one brand can differ from another.

Why such a spread? Fermentation time and flavoring. A longer ferment leaves less sugar but more acetic acid, which tastes sharper and more vinegary. Many producers stop earlier and soften the taste with fruit juice or other sweeteners. That means the label sugar can be a flavoring decision, not a fermentation result.

There is also a subtle point. Registered dietitian Erin Palinski-Wade told Health.com that kombucha may contain less sugar than its label suggests, so it may not raise blood sugar as much as other drinks with a similar sugar count. She suggests limiting it to around 8 ounces a day. The same article mentions a small 2023 study in which people who drank kombucha with a high-carb meal had lower blood sugar than those who drank unsugared beverages, but also that a 2025 review called the overall research inconsistent. Treat that as an interesting lead, not a promise.

A fair way to compare per 100 ml

A 330 ml can, a 500 ml bottle and an 8-ounce glass are three different sizes. Convert everything to the same unit:

1. Find “per 100 ml” on the nutrition panel. Belgian and EU labels list it by law, so it is usually the first column.
2. Read total sugars and energy (kcal) separately.
3. Check whether the label separates added sugars, and watch for juice concentrates, honey and syrups. These all count as sugars even when they sound wholesome.
4. Multiply by the amount you will actually drink.

Here is the arithmetic for a typical kombucha serving. 2 to 8 g in 237 ml works out to roughly 0.8 to 3.4 g per 100 ml. If a soda you are comparing lists 10 g or more per 100 ml, you can see the gap in seconds. If the kombucha shows 7 g per 100 ml, the gap nearly disappears. The label decides, not the category.

Caffeine, acidity and teeth

Caffeine

Kombucha is made from tea, so it contains some caffeine. About one-third of the tea’s caffeine remains after fermentation, which Time puts at roughly 10 to 25 mg per serving for black tea. Many sodas, colas especially, also contain caffeine, while others have none. If you are sensitive to it, or serving a drink to a child, read the ingredients.

Acidity

Both drinks are acidic. A Time article points out that kombucha’s low pH may affect tooth enamel in a way similar to soda. A dentist would give the same practical advice for both: drink with a meal rather than sipping for hours, don’t swish it around your mouth, and rinse with water afterward.

The acidity is also why people with reflux sometimes find kombucha uncomfortable. If a fizzy, tart drink bothers your stomach, speak with your doctor or pharmacist rather than trying to power through.

Safety notes

Fermentation produces trace compounds. A 2025 study in Frontiers in Sustainable Food Systems detected seven biogenic amines in kombucha and water kefir samples at concentrations low enough to pose minimal risk to consumers. The same study found that black tea kombucha had the highest antioxidant activity among the fermented drinks it tested. That is a lab result about the drinks, not proof of a health outcome in people.

Kombucha also contains a small amount of alcohol from fermentation. If you are pregnant, taking medication, or have a condition affecting your immune system, ask your doctor before making any fermented drink a habit.

So is kombucha healthier than soda?

On sugar, often yes, and that is the main honest reason to choose it. On everything else, be careful.

Dr. Zhaoping Li told Time that there is not enough scientific evidence to support most health claims about kombucha. Well-controlled studies are lacking, and many claims borrow from research on tea or the gut microbiome in general. Kombucha does contain tea compounds such as polyphenols and catechins, along with some vitamins and minerals, as listed in the 2023 review by Chong and colleagues. Having them in the drink is different from proving they do something for you.

A sensible reading: kombucha is a lower-sugar, more interesting drink than most sodas, if you pick well. It is not a detox, a cure or a replacement for fruit, vegetables and water.

Kombucha vs soda vs water kefir at a glance

Many readers who search this also ask about water kefir, so here is the three-way view.

Water kefir is made by fermenting a sugar solution with fresh or dried fruit and water kefir grains, and the main microbes are lactic acid bacteria, acetic acid bacteria and yeasts. The same review calls it a convenient dairy-free alternative to dairy-based fermented drinks. A 2023 study of the grains describes a 2 to 3 day ferment at 20 to 25 °C that leaves lactic acid, acetic acid, carbon dioxide and trace ethanol. Water kefir has no tea, so it has no caffeine, which suits people who avoid it.

How to choose well

A short checklist for the shop or the café menu:

• Read per 100 ml. Compare the sugar line to what you would normally drink, not to a perfect ideal.
• Scan for added juice, honey or syrup. These are common in flavored kombucha and they add to the sugar total.
• Pick the size you will finish. A small glass is easier to keep to than a liter bottle.
• Drink it with food. That is easier on enamel and on the stomach.
• Match the drink to the moment. A sharp, tart drink cuts through richness. A sweet drink on top of a sweet dessert doubles the sugar.

That last point leads to the practical bit: what to drink with something like a waffle.

Pairing a drink with a red velvet waffle

We are in Bruges, and waffles are part of the city’s rhythm. Our Red Velvet Heart Waffles began as a Valentine’s treat. They are a dessert-style bite, rich, soft and a little cocoa-tinged, and they behave like any other sweet food when you think about the drink beside them.

The pairing logic follows what the label-reading above tells you:

• Go tart and light. A drink with some acidity and little sugar refreshes the palate between bites. This is the reason a low-sugar fermented tea suits a rich waffle better than a cola would.
• Keep the total in mind. A sweet waffle plus a 330 ml soda stacks sugar on sugar. Choosing a smaller or unsweetened drink keeps the treat a treat.
• Water is a legitimate pairing. Rinsing with water after something sweet and acidic is the same habit dentists recommend after kombucha or soda.
• Hot drinks work too. Coffee or tea alongside a waffle is the classic choice for a reason.

For delivery or takeaway, the logic is the same. If you are ordering a waffle with a bowl or wrap, pick one sweet element per meal and let the rest be fresh. Our guide to Bruges signature drinks and red velvet waffles covers what to sip in the city, and the piece on waffles that survive 20 to 30 minutes of delivery explains how to order a waffle that is still good when it reaches your door.

Perspective

We cook and serve food that is meant to look and taste fresh, and drinks are part of that picture. When people ask us whether kombucha beats soda, we say that the real question is what you want from the moment. If you want a fizzy, sharp drink with less sugar, a well-chosen kombucha or a water kefir does that job.

If you are sitting down to something sweet and celebratory, like our Red Velvet Heart Waffles, we like the idea of letting the waffle be the indulgence and keeping everything around it light, fresh and colorful. That is how we build our bowls, salads and wraps too: bright ingredients, nothing heavy for the sake of it.

The simplest advice we give is to read the label per 100 ml, drink what you enjoy, and make the sweet thing worth it.

Mawghan

Order the waffle, build the rest around it

Our Red Velvet Heart Waffles are made as a seasonal special, and they sit alongside the fresh bowls, salads, wraps and specialty drinks we prepare daily for takeaway and delivery in Bruges. You can order through our site, or through Deliveroo, UberEats and Takeaway.com. We also self-deliver within a 20-mile radius.

A good order balances the table: a savory bowl or wrap first, the waffle to share, and a drink that suits the mix. Start on the Wild Foodz by Hotel Entree page to see what is on the menu now. If you want to plan the savory side, our guide to building a balanced bowl in Belgium walks through bases, protein and sauces. For the current waffle availability, check the menu on the site, since seasonal items change.

FAQ

Is kombucha really lower in sugar than soda?

Usually, but not always. A typical 8-ounce serving of kombucha has about 2 to 8 g of sugar, but Health.com cites a range up to 15 g. Compare the per 100 ml column on both labels and you will have your answer for that specific bottle.

Does kombucha have caffeine?

Yes, because it is brewed from tea. About a third of the tea’s caffeine remains after fermentation, which Time reports as roughly 10 to 25 mg per serving for black tea kombucha. Water kefir has none, if you want a fermented drink without caffeine.

Is kombucha bad for your teeth like soda?

Both are acidic, and kombucha’s low pH may affect enamel in a similar way, as Time notes. Drink it with a meal, avoid sipping slowly for hours, and rinse with water afterward. If you have sensitive teeth or erosion, ask your dentist.

What is the difference between kombucha and probiotic soda?

Kombucha is fermented tea, while probiotic soda is not fermented and has bacteria added. The Mayo Clinic Press says it is unclear how many of those added bacteria survive stomach acid. Check the label for “raw” or “unpasteurized” if live cultures matter to you.

What should I drink with a sweet waffle?

Choose something light, tart or unsweetened so the sugar does not double up. Water, tea, coffee or a low-sugar fermented drink all work. Pick one sweet item per meal and keep the rest fresh.

Sources

• Is Kombucha Healthy? Here’s What Experts Say, Time
• Probiotic drinks: What really works for gut health, Mayo Clinic Press
• What Happens to Your Blood Sugar When You Drink Kombucha?, Health.com
• Fermented Beverage Benefits: A Comprehensive Review, PMC
• Challenges in water kefir production, PMC
• Kombucha and Water Kefir Grains Microbiomes, PMC
• Fermented beverages study, Frontiers in Sustainable Food Systems

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