What is the most effective treatment for IBS?

The evidence for IBS management has evolved significantly. The low-FODMAP diet — developed by Monash University — has the strongest dietary evidence, producing symptom improvement in 50–80% of people who follow it properly. Gut-directed hypnotherapy also has remarkable evidence, with comparable outcomes to dietary approaches. Stress management, regular movement, and targeted probiotic use also show benefit.

What are FODMAPs and why do they affect IBS?

FODMAPs (Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols) are types of carbohydrates that are poorly absorbed in the small intestine and fermented by bacteria in the large intestine, producing gas and drawing water into the bowel. In people with IBS, this process causes exaggerated symptoms. A low-FODMAP diet reduces these fermentable carbohydrates, then systematically reintroduces them to identify personal triggers.

Is IBS a psychological condition?

IBS is not 'just psychological' — it involves real physiological changes in gut motility, visceral sensitivity, and microbiome composition. However, the brain-gut axis is central to IBS, and psychological factors significantly influence symptom severity. This is why psychological approaches like gut-directed hypnotherapy and CBT have such strong evidence — they address the gut-brain communication pathway directly.

What probiotics are most supported for IBS?

The evidence for probiotics in IBS is mixed, as different strains have different effects. Lactobacillus plantarum 299v has reasonable evidence for bloating and overall IBS symptoms. Bifidobacterium strains are often helpful for constipation-predominant IBS. A nutritional therapist or functional medicine practitioner can advise on strain selection based on your predominant symptoms.

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Irritable bowel syndrome

Irritable bowel syndrome (IBS) is a functional digestive disorder involving abdominal pain and altered bowel habits.

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Reviewed by Dr. Ciara Magee · Integrative Midwifery26 March 2026Research-supported

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IBS is a functional digestive disorder involving abdominal pain, bloating, and changes in bowel habits.

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What is Irritable bowel syndrome?

IBS is a common gastrointestinal condition characterised by abdominal discomfort, bloating, and changes in bowel movements.

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