Americans Are Taking More Probiotics, But Their Diets Are Not Becoming More Gut-Friendly
Probiotic supplements have become increasingly popular in the United States as more people look for ways to support their digestive health. However, a new study suggests that this growing interest in probiotics has not been matched by meaningful improvements in the everyday eating habits that help maintain a healthy gut microbiome.
Researchers found that probiotic use among Americans increased substantially between 2009 and 2023. At the same time, fiber consumption did not improve. Fiber is particularly important for gut health because it provides nourishment for many of the beneficial microorganisms living in the digestive system.
The findings raise an important question: Can taking a probiotic supplement really make up for a diet that lacks the foods needed to support a diverse and healthy gut microbiome?
Probiotic Use Has Increased Dramatically
According to the study, probiotic supplement use among U.S. adults increased by approximately 287% between 2009 and 2023. Among people younger than 20, the increase was even more striking, rising by about 786%.
Among adults aged 20 and older, the percentage of people reporting probiotic use increased from around 1.8% in 2009 to nearly 7% in 2023.
For younger people, probiotic use rose from approximately 0.6% to 5.6% during the same period.
The numbers show that probiotics have moved from being a relatively niche health product to something increasingly common among Americans of different age groups.
Researchers say this trend reflects growing public interest in the gut microbiome, the complex community of bacteria and other microorganisms that live throughout the digestive tract.
The gut microbiome has been linked to numerous aspects of health, including digestion, immune function and metabolism. Because of this growing awareness, many consumers are turning to probiotic products in an effort to improve or maintain their gut health.
However, the new research suggests that taking a supplement may not necessarily mean people are adopting other habits that support their microbiome.
Fiber Intake Went in the Wrong Direction
One of the most notable findings was related to dietary fiber.
Fiber is found naturally in foods such as vegetables, fruits, beans, lentils, nuts, seeds and whole grains. Certain types of fiber are fermented by gut microorganisms, producing compounds that can help support the intestinal environment.
Despite the sharp rise in probiotic supplement use, researchers found a small but statistically significant decline in average fiber intake during the study period.
That is important because probiotics and dietary fiber serve different purposes.
Probiotics generally contain live microorganisms that are intended to provide a health benefit when consumed in adequate amounts. Fiber, on the other hand, can act as a source of nourishment for microorganisms already living in the gut.
In other words, adding probiotic bacteria to the diet does not automatically provide the broader range of nutrients that gut microbes can obtain from a varied, plant-rich diet.
Healthy Microbe-Rich Foods Increased Only Slightly
The study also examined consumption of foods that can contain beneficial microorganisms, including products such as yogurt and kombucha.
Researchers observed only a modest increase in consumption of these types of foods.
This means that while Americans were increasingly purchasing probiotic supplements, their overall dietary pattern did not undergo a comparable transformation.
A person might take a probiotic capsule every morning while still eating relatively few vegetables, fruits, legumes and whole grains.
That distinction matters because a healthy microbiome is influenced by the overall dietary environment, not simply by the presence or absence of a particular supplement.
A diverse diet provides a broad range of fibers and plant compounds that can interact with the microorganisms in the digestive tract.
Supplements Are Not a Substitute for a Healthy Diet
The researchers behind the study caution that some consumers may view probiotic supplements as an alternative to improving their diet.
That could become a problem if taking a supplement creates a false sense that other healthy behaviors are no longer necessary.
A balanced eating pattern offers far more than probiotics alone.
Vegetables and fruits provide fiber, vitamins, minerals and numerous plant compounds. Legumes and whole grains can provide additional types of fiber and other nutrients. Nuts and seeds also contribute fiber and beneficial plant-based compounds.
Together, these foods can help create a more varied nutritional environment for the gut microbiome.
Lead researcher Dr. Kira Newman, a clinical assistant professor of internal medicine at the University of Michigan Medical School, emphasized the importance of dietary fiber and fresh produce for supporting the gut microbiome.
The researchers compared the idea of relying on a supplement with selecting only one part of a much larger picture. A healthy diet provides a variety of nutrients and compounds, while a single supplement is much more limited in scope.
What This Means for Consumers
The findings do not mean that probiotics are useless.
Certain probiotic products may provide benefits for particular health concerns, and research continues to investigate which probiotic strains may be useful in specific circumstances.
However, probiotics should not automatically be considered a replacement for healthy eating.
For people interested in supporting their gut health, focusing on the overall quality and variety of their diet may be a more comprehensive approach.
Simple dietary changes can include eating more vegetables and fruits, incorporating beans or lentils into meals, choosing whole grains more often and including nuts and seeds where appropriate.
Fermented foods such as yogurt and certain other fermented products can also be included as part of a balanced diet, depending on a person's nutritional needs and tolerance.
It is also worth remembering that individual responses to foods and supplements can differ. A product that works well for one person may not have the same effect for another.
The Bigger Picture of Gut Health
The study highlights an interesting disconnect in modern health habits.
People appear increasingly interested in their gut microbiome, yet that interest is not necessarily translating into the dietary changes that can support it.
This may partly reflect the appeal of convenience. Taking a capsule requires little effort compared with changing the way a person shops, cooks and eats.
But long-term health is rarely determined by one product.
Gut health is influenced by a combination of dietary patterns, physical activity, sleep, medications, medical conditions and other lifestyle factors. Researchers are still learning how these factors interact with the microbiome.
The new findings therefore serve as a reminder that there is no single shortcut to a healthy gut.
For consumers, the message is relatively straightforward: probiotics may be one part of a health strategy, but they should not overshadow the basics of a nutritious and varied diet.
Increasing the variety of plant-based foods on the plate can provide fiber and other nutrients that supplements cannot fully replicate.
Ultimately, the growing popularity of probiotics may be a sign that Americans are paying more attention to their digestive health. The next step may be turning that interest into healthier everyday food choices.
Sources
- University of Michigan, news release, September 8, 2026.
- Clinical Gastroenterology and Hepatology, study published September 7, 2026.
- National Health and Nutrition Examination Survey (NHANES), data covering 2009 to 2023.
Medical Disclaimer
This article is provided for general informational and educational purposes only. It is not intended to provide medical advice, diagnosis or treatment. Probiotic supplements may not be appropriate for everyone, and their effects can vary depending on the product, strain and individual circumstances. If you have a medical condition, take medication, are pregnant or breastfeeding, or are considering starting a probiotic supplement for a specific health problem, speak with a qualified healthcare professional before making changes to your diet or supplement routine.