The Efficacy of Hydrolyzed Guar Gum ( PHGG) in the Treatment of Patients With Irritable Bowel Syndrome (IBS)

Inclusion Criteria: * Fulfillment of the Rome III criteria for IBS. * Aged 20-68 years at the time of screening. * Provision of written informed consent. * Commitment of availability throughout the 6 months study period. Exclusion Criteria: * Major abdominal surgery in the past. * The presence of any active (organic)GI disease. * Past or present major medical or psychiatric illness. * Any concomitant disease. * Alarming symptoms (rectal bleeding, weight loss, etc.) * Pregnancy. * Family history of colorectal carcinoma or inflammatory bowel disease (IBD). * Abnormal laboratory studies (blood biochemistry , liver enzymes,complete blood count), abnormal thyroid function. * Non-adjusted diet in the case of lactose or gluten intolerance. * Recent travel to regions with endemic parasitic diseases.