Prebiotic sodas are gaining attention for an unexpected reason, but that doesn’t make them a replacement for whole foods
Soda has never exactly been known as a source of nutrition. But a newer generation of fizzy drinks is changing the conversation by adding ingredients such as prebiotic fiber, and new research suggests these drinks may offer more fiber than you’d expect.
A recent study comparing different beverage categories found that prebiotic sodas contained considerably more fiber than regular soda, diet soda, fruit drinks, and flavored sparkling water. Depending on the brand, a 12-ounce can contained roughly 2 to 9 grams of fiber, with about 5 grams being the average in the study.
That may sound impressive for a soda can—and it is worth noticing. But nutrition experts say there’s an important catch: a drink with added fiber can be a smarter choice than a sugary soda without becoming a substitute for vegetables, fruit, beans, whole grains, and other naturally fiber-rich foods.
What the study found about prebiotic sodas
Researchers analyzed the nutrition information of prebiotic sodas introduced in the U.S. between 2021 and 2025. They compared them with several other beverage categories, including regular sodas, diet sodas, fruit drinks, and flavored sparkling waters.
On average, prebiotic sodas contained approximately:
- 35 calories per 12-ounce can
- 5 grams of sugar
- 5 grams of fiber
The exact numbers varied from product to product. Some drinks contained as little as about 2 grams of fiber, while others reached around 9 grams per can.
The researchers also found that prebiotic sodas generally contained less sugar and fewer calories than traditional sodas and many fruit drinks. However, diet sodas and unsweetened or lightly flavored sparkling waters generally came out ahead when it came to calories and sugar.
So, the takeaway isn’t that prebiotic soda is suddenly a health drink. Instead, its nutritional profile may make it a more appealing option when the alternative is a regular sugary soda.
Why does prebiotic soda contain so much fiber?
The answer is actually in the name.
Prebiotics are types of dietary fiber that aren’t fully digested by the body. Instead, certain beneficial bacteria in the gut can use them as a source of nourishment.
Carlos R. Soto Díaz, MPH, a study co-author and researcher at the University of North Carolina at Chapel Hill, explained that prebiotic sodas generally have added fiber because that fiber is central to their prebiotic positioning and gut-health claims.
Manufacturers may use ingredients such as inulin, chicory root fiber, artichoke-derived ingredients, or cassava-based fiber to increase the amount of fiber in these beverages.
That means the fiber isn’t an accidental bonus. It’s deliberately added during formulation.
And because there isn’t one mandatory amount of fiber that a beverage has to contain before it can be marketed as “prebiotic,” checking the Nutrition Facts label is still important.
How can a soda have more fiber than fruit juice?
This part may seem surprising.
Fruit is naturally associated with fiber, so it might seem logical that fruit juice would be a better source. But there’s a major difference between eating a whole piece of fruit and drinking its juice.
Most of the fiber in fruit is located in the pulp, skin, and other solid portions. During juicing, much of that material is removed. What remains is primarily liquid containing water and naturally occurring sugars, along with varying amounts of vitamins and other nutrients.
Prebiotic soda takes the opposite approach. Instead of relying on the naturally occurring fiber in a fruit, manufacturers can add isolated or extracted sources of fiber directly to the beverage.
That’s why a prebiotic soda can end up with more fiber than a glass of fruit juice.
It doesn’t mean the soda is nutritionally superior to whole fruit. A whole apple, orange, pear, or handful of berries offers far more than fiber alone.
Prebiotic and probiotic don’t mean the same thing
If you’ve ever wondered why some trendy drinks say “prebiotic” while others say “probiotic,” you’re not alone.
The terms sound almost identical, but they refer to different things.
Prebiotics are certain types of fiber that can serve as food for microorganisms already living in the gut.
Probiotics, meanwhile, are live microorganisms that are consumed with the intention of providing a health benefit.
You can find naturally occurring prebiotic fibers in foods such as onions, garlic, asparagus, bananas, and whole grains. Probiotic microorganisms are commonly associated with fermented foods such as yogurt, kefir, kimchi, and sauerkraut.
Some beverages may contain one, the other, or both, which can make the labels confusing.
Does five grams of fiber from soda really matter?
It can.
General daily fiber recommendations are around 25 grams for women and 38 grams for men, although individual needs can vary based on factors such as age and calorie intake.
That means a beverage containing 5 grams of fiber could provide a meaningful portion of someone’s daily target. A drink containing 9 grams would contribute even more.
But there’s a difference between getting some fiber from a drink and building a high-fiber diet around drinks.
Dietitians generally recommend getting most of your fiber from foods such as vegetables, fruits, beans, lentils, nuts, seeds, and whole grains. These foods can provide fiber alongside vitamins, minerals, protein, healthy fats, and other nutrients.
Think of the fiber in a prebiotic soda as a bonus—not the foundation of your diet.
Prebiotic soda isn’t automatically low in sugar
The word “prebiotic” can create a health halo around a product, making it easy to assume that everything about the drink is good for you.
That’s not necessarily the case.
The study found that prebiotic sodas generally had less sugar than traditional sodas, but sugar levels differed between products. Some beverages may also contain naturally occurring sugars from ingredients such as fruit juice even when they don’t contain added sugar.
That’s why it’s worth checking both total sugar and added sugar instead of judging a drink based solely on its marketing.
And if you drink several cans throughout the day, even a relatively modest amount of sugar per can can add up.
When is a prebiotic soda a good swap?
This is where the context really matters.
If you’re reaching for a traditional sugar-sweetened soda and choose a prebiotic version instead, you may end up consuming fewer calories and less sugar while getting some additional fiber.
That’s potentially a useful trade.
But if your usual drink is plain water or unsweetened sparkling water, switching to a sweetened prebiotic soda may actually add calories and sugar that weren’t there before.
In other words, what you’re replacing matters just as much as what’s in the can.
A prebiotic soda can make sense for someone who enjoys sweet, fizzy beverages and wants a lower-sugar alternative to conventional soda. It doesn’t necessarily make sense as an upgrade from water.
How to choose a better prebiotic soda
If you enjoy these drinks, a quick label check can help you make a more informed choice.
Look for:
Fiber content: Compare the grams of fiber per serving rather than assuming every prebiotic soda contains the same amount.
Added sugar: “Prebiotic” doesn’t automatically mean sugar-free. Check the actual number.
Total sugar: This can help you understand how much sugar you’re consuming from all sources.
Calories: If you’re drinking these regularly, calories can add up even when they’re lower than traditional soda.
Serving size: Make sure the nutrition information applies to the entire can. Some products may list more than one serving per container.
The bottom line
Prebiotic sodas have earned attention for their surprisingly high fiber content. Research comparing beverage categories found that these drinks can contain substantially more fiber than regular soda, diet soda, fruit drinks, and flavored sparkling water, with some products providing up to about 9 grams in a 12-ounce can.
That’s a useful nutritional feature, particularly when a prebiotic soda replaces a conventional sugary soda.
But don’t let the word “prebiotic” turn soda into a health food in your mind. These drinks are still formulated beverages, and their sugar, calorie, and fiber levels can vary considerably.
For everyday hydration, water and unsweetened sparkling water remain simple choices. And when you’re trying to increase fiber, whole foods should still do most of the heavy lifting.
So go ahead and enjoy a prebiotic soda if you like one. Just think of its fiber content as a nice extra—not a reason to skip the salad, fruit, beans, or whole grains.
