Inclusion Criteria:  Recreational athlete (defined as a person who is physically active but does not train for competition at the same level of intensity and focus as a competitive athlete ) Diagnosed with irritable bowel syndrome  Exclusion Criteria:  Other gastrointestinal diseases such as inflammatory bowel disease, other serious chronic diseases, coeliac disease, have an allergy to product ingredients (milk), diabetic and pregnant or breastfeeding. unable to fast overnight, undergoing antibiotic therapies, bowel preparation for investigative procedures, and change to IBS medication during the past month prior to data collection.