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Tummy Troubles? How Dietary Changes Can Tame an Irritable Bowel

Tummy Troubles
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Written by Andrew Le, MD.
Medically reviewed by
Clinical Physician Assistant, Summit Health
Last updated May 23, 2024

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If you're among the many who endure the chronic abdominal pain and unpredictable bathroom trips of irritable bowel syndrome (IBS), you're not alone. A review from the Proceedings of the Nutrition Society's Summer Meeting 2015, led by Heidi M. Staudacher and Kevin Whelan of King's College London, examines the intricate relationship between diet, gut microbiota, and this discomforting condition.

IBS – a widespread yet poorly understood digestive ailment – manifests as abdominal pain coupled with irregular bowel movements. Evidence increasingly implicates the gastrointestinal (GI) microbiota in IBS's development.

One microbe in particular, Bifidobacteria, shows a strong link to IBS; lower levels correlate with more severe symptoms. The good news is, dietary interventions aimed at the GI microbiota, like probiotics and the low fermentable oligosaccharides, disaccharides, monosaccharides, and polyols (FODMAP) diet, have shown promising results.

Probiotics, live microorganisms benefiting the host, could be effective in IBS treatment by potentially reshaping the community of gut bacteria. Studies echo their ability to alleviate overall IBS symptoms, though the evidence for individual probiotic strains and specific IBS symptoms varies.

Prebiotics, non-digestible food components that promote beneficial bacterial growth, may also help IBS patients by increasing Bifidobacteria counts. However, some types of prebiotics may exacerbate IBS symptoms, which calls for more targeted research.

The low FODMAP diet presents a newer approach that avoids short-chain fermentable carbs known to induce IBS symptoms. Reducing these carbs appears to ease IBS-related discomfort. However, this restriction also decreases Bifidobacteria levels, leading to an interesting paradox: what's good for symptoms may alter the microbiota unfavorably.

Understanding how dietary changes affect gut bacteria is critical in recommending safe and effective treatments for IBS. The low FODMAP diet, for example, has clinical efficacy but inadvertently affects one's gut microbiota. Future research should explore combining the diet with probiotics to prevent potential adverse impacts on gut bacteria.

IBS’s complexity means no one-size-fits-all solution, but tweaking what we eat offers a promising route to relief. As we deepen our grasp of this condition, the interplay between the food we consume and the tiny tenants of our intestines could hold the key to better managing these often debilitating symptoms.

For more in-depth information on the role of diet and gut microbiota in managing IBS, access the full article here.

Article summary credit: The Nutrition Society Summer Meeting 2015.

Remember, finding what works for you could be just around the corner. Consult with a healthcare professional before making significant changes to your diet, especially if you suffer from IBS.

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Clinical Physician Assistant, Summit Health
Jeff brings to Buoy 20 years of clinical experience as a physician assistant in urgent care and internal medicine. He also has extensive experience in healthcare administration, most recently as developer and director of an urgent care center. While completing his doctorate in Health Sciences at A.T. Still University, Jeff studied population health, healthcare systems, and evidence-based medicine....
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References

Staudacher, H. M., & Whelan, K. (2016). Altered gastrointestinal microbiota in irritable bowel syndrome and its modification by diet: probiotics, prebiotics and the low FODMAP diet. Proceedings of the Nutrition Society, 75(3), 306-318. https://doi.org/10.1017/S0029665116000021