Aim: The purpose of this study was to describe the occurrence of self report bloating and related factors in patients with Irritable bowel syndrome (IBS).Background: Bloating symptoms are common in patients with IBS and have significant impact on normal daily function. Patients and methods: This study was a community-based cross-sectional survey that conducted using a valid questionnaire base on Rome III criteria. Univariate analysis was used for investigation about distribution of self reported bloating according to demographic and psychological factors in Irritable bowel syndrome patients. Results: Out of 18180 subjects under study, 198 cases met criteria for the diagnosis of the Irritable bowel syndrome according to criteria ROME III and 61.6% reported bloating symptoms. Bloating symptoms were more prevalent among patients with intermittent symptoms and diarrhea than in patients with constipation. Catastrophic events and depression were independent risk factors for bloating.Conclusion: Findings of this study support the clinical impression regarding the high prevalence of bloating symptoms in patients with Irritable bowel syndrome. Further studies are needed to understand the role of physiological and psychological factors and their interaction in development of bloating in Irritable bowel syndrome patients.

Introduction: Irritable bowel syndrome (IBS) is the most common functional gastrointestinal disorder, which is characterized by the presence of abdominal pain or discomfort associated with altered bowel habits. This systematic review aimed to assess the nutritional factors (dietary patterns and food groups) associated with IBS. Methods: Articles were collected via searching in databases such as Medline, EMBASE, CINAHL, ProQuest, PubMed, Scopus, ScienceDirect, and Google Scholar using relevant keywords and phrases, including Irritable bowel syndrome, pattern, intake, behavior, habit, meal, nutrition, food, lifestyle, and prevalence. The articles were confined to the original human studies that were published in English since 2010. Duplicates and unrelated materials were excluded. Results: Consumption of processed meat, fast foods, and legumes has been reported to increase the risk of IBS. However, the correlation between the consumption of milk, fruits, and vegetables has not been conclusive. Moreover, the association between cereal intake and risk of IBS varies depending on the type of cereals. The results also indicated that fast food dietary patterns increased the risk of IBS, while lacto-vegetarian dietary patterns reduced the risk of IBS. Conclusion: According to the results, the effects of some food groups on IBS are unclear. In addition, research in this regard is limited to food patterns, and further investigations are required in order to reach conclusive results.

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