For years, supermarket “gut health” largely meant yoghurt and probiotics. Today, the same language appears on kombucha, kefir, supplements, snacks and even fizzy drinks.
The shift reflects growing interest in the gut microbiome, as well as a booming market for products positioned around digestive health. The important question is no longer simply whether something says “gut health” on the label. It is what is actually inside it, and whether the claim matches the evidence.
Key Takeaways
- Probiotics, prebiotics and postbiotics are different, and the terms should not be used interchangeably.
- Fermented does not automatically mean probiotic.
- Major beverage companies are investing heavily in drinks positioned around gut health.
- The ingredient, amount and supporting evidence matter more than the claim on the front of the pack.
How Gut Health Moved Beyond Yoghurt
Gut health has become a much broader consumer category.
Kombucha brought fermented drinks into cafés and supermarket fridges. Kefir expanded beyond specialist health stores. Prebiotic sodas then took the idea somewhere unexpected: the soft-drink aisle.
Big beverage companies have noticed. PepsiCo completed its USD 1.95 billion acquisition of the prebiotic soda brand Poppi in 2025, while Coca-Cola launched Simply Pop, which contains 6g of prebiotic fibre per can.
But the science behind these products varies. A fermented drink, a probiotic yoghurt and a prebiotic soda may all fall under the “gut health” umbrella, yet work in very different ways.
Probiotics, Prebiotics and Postbiotics:
What Is the Difference?
| Term | What It Means | What to Look For |
| Probiotics | Live microorganisms that provide a health benefit when consumed in adequate amounts | Named strains and evidence supporting the dose |
| Prebiotics | Substances selectively used by microorganisms in the body that provide a health benefit | Type and amount of prebiotic ingredient or fibre |
| Postbiotics | Preparations of inanimate microorganisms and/or their components that provide a health benefit | A clearly identified preparation with supporting evidence |
The distinction matters because not every fermented food is automatically a probiotic.
Kombucha and kefir can contain live microorganisms, for example, but the mere presence of microbes does not prove that a product meets the scientific definition of a probiotic. The specific microorganism, amount, and demonstrated health benefit all matter.
The same applies to prebiotics. Adding a small amount of fibre does not necessarily mean a product will have a meaningful effect on gut health.
The Poppi Lesson
Poppi became one of the biggest names in prebiotic soda, and also an example of why consumers should look beyond front-of-pack claims.
The parties agreed to a USD 8.9 million settlement, which received final court approval in April 2026. The settlement did not amount to an admission of wrongdoing.
The case does not mean prebiotic sodas as a category are ineffective. It highlights a simpler point: a gut-health claim is not proof that a product contains an effective amount of the ingredient it claims to contain.
How to Read a Gut-Health Label
Check the amount, not just the ingredient.
If a drink contains prebiotic fibre, look at how many grams you actually get per serving. For context, Singapore recommends daily fibre intakes of 20g for women and 26g for men.
Look for specifics with probiotics.
A named microorganism or strain is more informative than a vague “contains probiotics” claim. Benefits demonstrated for one probiotic cannot automatically be assumed to apply to another.
Do not assume fermented means probiotic.
Kombucha, kefir and other fermented foods may contain microorganisms, but their composition can vary considerably from one product to another.
Look at the whole nutrition label.
A functional ingredient does not automatically make the entire product healthier. Consider sugar, calories and the rest of the ingredient list too.
The Bottom Line
Gut health did not really leave the dairy aisle. It simply spread across the supermarket.
Kombucha, kefir, prebiotic soda and newer microbiome-focused products have given consumers more choice, but also more claims to evaluate.
Instead of asking whether something is marketed for “gut health”, look at what it contains, how much is there, and what evidence supports the benefit.
Editorial Note
This article is for general educational purposes and does not constitute medical or nutritional advice. Product formulations and evidence can change. Speak with a qualified healthcare professional or dietitian if you have digestive symptoms or a medical condition.
Sources
- Marco, Maria L., et al. “The International Scientific Association for Probiotics and Prebiotics (ISAPP) Consensus Statement on the Definition and Scope of Gut Health.” Nature Reviews. Gastroenterology & Hepatology, 2026. https://www.nature.com/articles/s41575-026-01176-x
- Hill, Colin, et al. “The International Scientific Association for Probiotics and Prebiotics Consensus Statement on the Scope and Appropriate Use of the Term Probiotic.” Nature Reviews. Gastroenterology & Hepatology, 2014. https://www.nature.com/articles/nrgastro.2014.66
- Scott, Karen, et al. “Expert Consensus Document: The International Scientific Association for Probiotics and Prebiotics (ISAPP) Consensus Statement on the Definition and Scope of Prebiotics.” Nature Reviews. Gastroenterology & Hepatology, 2017. https://www.nature.com/articles/nrgastro.2017.75
- Salminen, Seppo, et al. “The International Scientific Association of Probiotics and Prebiotics (ISAPP) Consensus Statement on the Definition and Scope of Postbiotics.” Nature Reviews. Gastroenterology & Hepatology, 2021. https://www.nature.com/articles/s41575-021-00440-6
- PepsiCo. “PepsiCo completes acquisition of poppi, accelerating strategic portfolio transformation.” PepsiCo, 2025.
https://www.pepsico.com/newsroom/press-releases/2025/pepsico-completes-acquisition-of-poppi-accelerating-strategic-portfolio-transformation
- The Coca-Cola Company. “Simply Brings a Juicy Pop to Booming Prebiotic Soda Category.” The Coca-Cola Company, 2025.
https://www.coca-colacompany.com/media-center/simply-brings-a-juicy-pop-to-booming-prebiotic-soda-category
- United States District Court, Northern District of California. “VNGR Beverage, LLC Litigation — Final Approval Order.” Justia, 2026.
https://docs.justia.com/cases/federal/district-courts/california/candce/4%3A2024cv03229/430241/80
- HealthHub Singapore. “Boost Your Health: The Essential Benefits of Dietary Fiber.” HealthHub Singapore, 2025.
https://www.healthhub.sg/well-being-and-lifestyle/food-diet-and-nutrition/more-fibre-for-a-fit-and-fabulous-you