Exercise, SIBO, and Gut Health: Why Movement Matters
Key Takeaways
Research suggests that physical activity can influence the gut microbiome and may help with digestive symptoms such as gas, bloating, and abdominal discomfort.
Exercise affects gastrointestinal function, but we do not yet know whether it improves the specific small-intestinal motility problems associated with SIBO.
More is not necessarily better: prolonged or strenuous exercise can sometimes aggravate gastrointestinal symptoms.
When we think about taking care of our gut, food tends to get most of the attention. But how we move our bodies matters, too.
We do not yet have much research looking specifically at the relationship between exercise and small intestine bacterial overgrowth (SIBO) symptoms. But researchers have studied the influence of physical activity on other gastrointestinal conditions, particularly irritable bowel syndrome (IBS), and have also explored how exercise affects digestive function and the gut microbiome. The findings give us some good reasons to make movement part of the bigger picture of gut health.
Here are three ways movement may matter for your gut.
#1: Movement Can Change Your Gut Microbiome
Your gut microbiome is not static. Diet, medications, environment, and importantly, physical activity, can all influence the microorganisms that live there.
Research suggests that regular exercise can change the composition and activity of the gut microbiome, including its production of short-chain fatty acids (SCFAs), compounds that play important roles in the intestinal environment.
For SIBO, there is still more to learn. Most exercise-and-microbiome research looks at stool, which tells us more about the large-intestinal microbiome than the small intestine where SIBO occurs.
Bottom line: Your microbiome responds to more than what is on your plate. Movement matters, too.
#2: A Moving Body Can Help a Troublesome Gut
One of the most interesting things about the exercise research may be something much more immediate: how your gut feels.
Research in people with IBS has found that increasing frequency of physical activity can improve digestive symptoms. That research is particularly relevant to SIBO because there is substantial overlap between the two conditions. IBS and SIBO share many of the same symptoms, including gas, bloating, abdominal pain, constipation, and diarrhea. Exercise is now included in evidence-based IBS guidelines as one approach that may help improve symptoms.
Movement may be particularly helpful when it comes to gas and bloating. Mild physical activity has been shown to help gas move through the intestine, and people with IBS who became more physically active have described easier gas passage and improvements in bloating and abdominal discomfort.
Physical activity also interacts with motility, the coordinated movement of material through the digestive tract. Motility is especially interesting in SIBO because normal small-intestinal movement helps protect against bacterial accumulation. Between meals, waves of contractions called the migrating motor complex (MMC) help move food remnants, secretions, and microbes through the stomach and small intestine. Disruptions in this process can create conditions that make bacterial overgrowth more likely.
The exercise-motility relationship is complex: activity can affect different parts of the digestive tract in different ways, and we do not yet know whether exercise influences the specific small-intestinal motility patterns involved in SIBO.
Bottom line: Movement can influence how the digestive system functions and may influence some of the digestive symptoms that also make SIBO so uncomfortable.
#3: Your Gut Knows the Difference Between Movement and a Marathon
If some movement is good, more must be better, right? Your gut might disagree.
How the digestive system responds to exercise depends partly on how long and how intensely you are moving. Prolonged or strenuous exercise can temporarily change blood flow and movement within the gastrointestinal tract and contribute to nausea, cramping, diarrhea, and other digestive complaints. These effects are particularly well documented in endurance athletes.
Researchers have also found that strenuous exercise can disrupt some of the normal motor activity in the small intestine. That does not make intense exercise “bad” for the gut, but it does remind us that exercise and digestion have a more complicated relationship than simply “more movement equals better digestion.”
Bottom line: When it comes to your gut, harder is not necessarily better.
The Takeaway: Movement Does Not Have to Mean a Workout
Studies of exercise and gastrointestinal health have looked at many different forms of physical activity, and there is no evidence that one particular type is best for SIBO. Instead of searching for the perfect SIBO workout, think about movement you enjoy, can do consistently, and that feels good for your body.
Walking counts. So does cycling, swimming, yoga, strength training, or whatever else gets you moving.
Movement does not need to become another SIBO treatment to check off your list. It can simply be one part of taking care of your gut and the rest of you.
Key References
Allen, J. M., Mailing, L. J., Niemiro, G. M., Moore, R., Cook, M. D., White, B. A., Holscher, H. D., & Woods, J. A. (2018). Exercise alters gut microbiota composition and function in lean and obese humans. Medicine & Science in Sports & Exercise, 50(4), 747–757. https://doi.org/10.1249/MSS.0000000000001495
Bi, L., & Triadafilopoulos, G. (2003). Exercise and gastrointestinal function and disease: An evidence-based review of risks and benefits. Clinical Gastroenterology and Hepatology, 1(5), 345–355. https://doi.org/10.1053/S1542-3565(03)00178-2
Boytar, A. N., Skinner, T. L., Wallen, R. E., Jenkins, D. G., & Dekker Nitert, M. (2023). The effect of exercise prescription on the human gut microbiota and comparison between clinical and apparently healthy populations: A systematic review. Nutrients, 15(6), 1534. https://doi.org/10.3390/nu15061534
Fukudo, S., Okumura, T., Inamori, M., et al. (2021). Evidence-based clinical practice guidelines for irritable bowel syndrome 2020. Journal of Gastroenterology, 56, 193–217. https://doi.org/10.1007/s00535-020-01746-z
Hawley, J. A., Forster, S. C., & Giles, E. M. (2025). Exercise, the gut microbiome and gastrointestinal diseases: Therapeutic impact and molecular mechanisms. Gastroenterology, 169, 48–62. https://doi.org/10.1053/j.gastro.2025.01.224
Johannesson, E., Simrén, M., Strid, H., Bajor, A., & Sadik, R. (2011). Physical activity improves symptoms in irritable bowel syndrome: A randomized controlled trial. The American Journal of Gastroenterology, 106(5), 915–922. https://doi.org/10.1038/ajg.2010.480
Jensen, M. M., Pedersen, H. E., Clemmensen, K. K. B., Ekblond, T. S., Ried-Larsen, M., Færch, K., Brock, C., & Quist, J. S. (2024). Associations between physical activity and gastrointestinal transit times in people with normal weight, overweight, and obesity. The Journal of Nutrition, 154, 41–48. https://doi.org/10.1016/j.tjnut.2023.06.005
Sharabi, E., & Rezaie, A. (2024). Small intestinal bacterial overgrowth. Current Infectious Disease Reports, 26, 227–233. https://doi.org/10.1007/s11908-024-00847-7
Simrén, M. (2002). Physical activity and the gastrointestinal tract. European Journal of Gastroenterology & Hepatology, 14(10), 1053–1056