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The results of the symptom diaries showed that watchful waiting in the control group resulted in a 50% pain reduction (A) and bloating reduction trend (B). In diet groups, two weeks on the open-label low-FODMAP-diet resulted in significant decreases in pain and bloating scores (C,D). However, after the subsequent two weeks provocations, pain and bloating scores returned to baseline levels regardless of the provocation placebo (p < 0.05, nocebo effect) or FODMAPs (C,D). * p < 0.05.
