A self-administered questionnaire was completed by 103 members of a self-help group for irritable bowel syndrome (IBS) and 130 controls, to compare the presence of IBS symptoms. Dietary fibre prescription, compliance and effi cacy were documented in the IBS group. There were significant differences in the frequency of defaecation and number of symptoms present between the two groups. Most of the IBS subjects had been prescribed a high fibre diet but adherence to the diet and symptomatic improve ment were poor. In contrast many IBS sufferers were following a range of diets not prescribed by their doctor. The seriousness of the IBS condition was highlighted by the fact that 8% of the IBS group had retired early due to their condition.
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