Mindfulness and meditation

Mindfulness training teaches intentional attention to present-moment experience and non-judgmental awareness of body sensations and emotions, usually through an eight-week group programme such as mindfulness-based stress reduction (MBSR) with weekly sessions, a half-day retreat, and daily home practice PMID 21691341. In IBS the proposed mechanism is not relaxation as such but a change in how gut sensations are noticed and interpreted, reducing the catastrophising and vigilance that amplify pain. It sits alongside CBT and hypnotherapy as a brain-gut behavioural approach, though with a smaller trial base.

The best-designed trial randomised 75 women with IBS in North Carolina to eight weekly sessions plus a half-day intensive of either mindfulness training or a support group with the same contact time. IBS severity fell by 26.4% in the mindfulness group versus 6.2% in the support group immediately after training, and by 38.2% versus 11.8% at three-month follow-up; quality of life, psychological distress, and visceral anxiety did not differ between groups right after treatment but did at three months. Participants rated the two programmes as equally credible after the first session, which argues against expectation alone explaining the result PMID 21691341. A Canadian trial randomised 90 patients to an immediate MBSR programme or a wait list; symptom severity improved more with MBSR after the course, but dropout was 44% in the MBSR arm versus 23% in controls, and at six months the wait-list group had also improved so that the between-group difference was no longer statistically significant PMID 22618308.

A later single-arm study at UCLA followed 68 adults through an eight-week MBSR class without a control group and reported a 71% responder rate for gastrointestinal symptoms, with increases in the “acting with awareness” facet of mindfulness most strongly predicting improvement PMID 32266762. Uncontrolled results like this show that the programme is feasible and point to mechanisms, but cannot separate the training from time, attention, and regression to the mean. The 2020 network meta-analysis of 41 psychological-therapy trials in IBS found the largest and most consistent evidence for CBT and gut-directed hypnotherapy, and warned that risk of bias was high across the field and that effects were probably overestimated PMID 32276950.

Points clinicians commonly raise: the two randomised trials used different controls and got different durability, so the honest summary is “promising, not settled”; an active control such as a support group is a harder test than a wait list, and the mindfulness result survived it at least to three months; eight weeks of group sessions plus daily practice is a real commitment, and dropout in one trial was high; and mindfulness apps and short courses have not been tested in IBS, so results from structured MBSR should not be assumed to apply to them.

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