AIRE-2 Device for Study of Breath Analysis in IBD

Inclusion criteria (IBD): * Age 18-75 years old, confirmed diagnosis of IBD (UC or CD) * Under clinical remission for at least 3 months * Report having one or more IBS-like symptom (abdominal pain, altered bowel habit, flatulence, abdominal distension etc) * Own a smartphone with Bluetooth capability * Fluent in English. * Able to understand the instructions to use smartphone apps * Able to provide informed consent Exclusion criteria (IBD): * Use of antibiotics 1 month before enrolment * Active IBD (disease activity score, fecal calprotectin, CRP) * History of bowel resection * Presence of a stoma * Pregnancy * Type 1 diabetes or insulin-dependent Type 2 diabetes * Currently being treated for eating disorder, schizophrenia, psychosis or other acute mental disorder A total of 30 adult IBD patients (18-75 years old), 15 ulcerative colitis (UC) and 15 Crohn's disease (CD) patients, will be recruited at the Digestive Diseases Clinic, McMaster University, Hamilton, Ontario. Controls: A total of 30 non-IBD volunteers from the same household as the recruited IBD patients who do not have any IBS-like symptom will be recruited as controls. Inclusion criteria: * Age 18-75 years old, IBS-negative (Rome IV negative) * Living in the same household as IBD patients, sharing a similar diet * Asymptomatic * Own a smartphone with Bluetooth capability * Fluent in English. * Able to understand the instructions to use smartphone apps * Able to provide informed consent Exclusion criteria: * Diagnosed with IBD or other Gastrointestinal disorder * Use of antibiotics 1 month before enrolment * Pregnancy * Type 1 diabetes or insulin-dependent Type 2 diabetes * Currently being treated for eating disorder, schizophrenia, psychosis or other acute mental disorders.