IBS - Irritable Bowel Syndrome

The purpose of this study is to evaluate the effectiveness of a mobile application (app) in helping clinicians and dietitians provide personalized low-FODMAP diet (LFD) therapy for patients with Irritable Bowel Syndrome (IBS). The study also aims to explore the potential biological mechanisms behind the clinical outcomes of this dietary intervention. Participants diagnosed with IBS will be recruited and screened through clinical questionnaires. Eligible participants will receive dietary education from a dietitian and be randomly assigned to one of two groups: the AI-assisted LFDapp group or the LFD booklet group. The study consists of three main phases: Initial Intervention (4-6 weeks): Participants will follow their assigned diet intervention and complete assessments regarding gastrointestinal symptoms, psychological traits (such as anxiety and depression), and quality of life. Reintroduction Phase (12 weeks): Participants who respond well to the diet will enter a phase where specific foods are gradually reintroduced. Personalization \& Follow-up (4 weeks): A personalized diet will be established, followed by a final evaluation of bowel function and mental well-being. Researchers will use various standardized questionnaire to track changes in symptoms and overall well-being throughout the study period.

The goal of this interventional study is to examine whether those patients with irritable bowel syndrome (IBS) and a reduced abitility do degrade starch and sugar (lowe levels of enzymes) have lower raise in blood glucose after a meal than those with normal expression of enzymes. We also want to examine whether those IBS patients with reduced enzyme levels have increased bowel symptom in relation to this meal. The main questions it aims to answer are: Does reduced ability to degrade starch and sugar due to less enzyme activity lead to lower increase in blood glucose after a meal? Does reduced ability to degrade starch and sugar due to less enzyme activity lead to increased bowel symptoms after a meal?

Observational, multicenter, prospective study aimed at characterizing the gut microbiome in patients with post-infectious irritable bowel syndrome (PI-IBS) using whole genome sequencing (WGS). The study will compare microbiome composition and function between PI-IBS patients and two control groups (post-infectious subjects without irritable bowel syndrome -IBS- and healthy controls), with the goal of identifying reproducible microbial signatures and target taxa associated with disease and symptom severity.

Multicenter randomized controlled clinical trial comparing ebastine and mebeverine as treatment of irritable bowel syndrome Trial rationale 1. To perform a randomized superiority trial comparing the clinical efficacy of ebastine and mebeverine 2. To evaluate the impact of treatment with ebastine compared to mebeverine on quality of life and quality-adjusted life years Primary objective To provide further evidence of the superiority of histamine 1 receptor antagonism as novel treatment for patients with non-constipated IBS, as compared to mebeverine, one of the spasmolytics currently used as first line treatment of IBS. Secondary objective(s) To provide evidence that the histamine 1 receptor antagonist ebastine is more effective in reducing abdominal pain compared to the commonly used antispasmodic mebeverine

This study will serve as a pilot randomized controlled trial to assess the feasibility of Psilocybin-Assisted Psychotherapy (PAP) in Treating Irritable Bowel Syndrome (IBS). Patients with severe IBS will undergo 3 pre-psychotherapy sessions with two licensed and trained psychedelic therapists, then will be randomized to undergo a guided psychotherapy session with single 25 mg oral "high" dose of psilocybin or a single 100 mg dose of niacin (active placebo) and attend 4 post-therapy integration sessions.

The purpose of this research is to study the added benefit of treating IBS symptoms with a medication called mirtazapine in treating IBS symptoms when paired with a low-FODMAP diet compared to a low-FODMAP diet alone. FODMAP stands for fermentable oligosaccharides, disaccharides, monosaccharides, and polyols. These are short-chain carbohydrates that can cause digestive distress in some people. You have been asked to take part in this research because you have symptoms of diarrhea-predominant irritable bowel syndrome that may respond to treatment with a combination of a medication called mirtazapine and a low-FODMAP diet.

Irritable bowel syndrome is a functional bowel disorder that affects many Canadians. The syndrome involves abdominal pain and change in frequency or form of bowel movements, and these symptoms can lead to a decreased quality of life for patients. Primary care physicians are dissatisfied with current referral processes, and patients may wait a long time to receive the correct diagnosis. Diet is known to exacerbate symptoms of IBS. In Canada, accessing dietary treatment for IBS is a challenge due to lack of resources. Some patients lack access to dietary interventions, and others are given advice that is not evidenced based. Use of eHealth technology, such as virtual education delivered by a dietician, may allow for more widespread access to dietary interventions for IBS. Virtual education can include one on one dietary education, online group-based education, and the use of apps. Currently, there is a gap in knowledge whether dietary intervention for IBS, delivered virtually by a dietician, is effective in treating IBS.

This clinical study aims to evaluate the use of i3.1 probiotic in participants who meet the Institute of Medicine (Canadian Consensus Criteria) case definition for ME/CFS and who may or may not be diagnosed with irritable bowel syndrome (IBS). The main questions it aims to answer are: * how effective is the usage of the i3.1 probiotic to reduce gastrointestinal (GI) inflammation and normalize the GI and systemic/brain interface? * how well is it working on IBS severity? The study sample is 100 male and female participants aged 45 to 70 years with ME/CFS (per the Canadian Consensus Criteria); one-half of the participants will have co-morbid IBS (per Rome IV criteria). Participants will receive an i3.1 or a placebo and be assessed at baseline, at eight weeks, and at 12 weeks (four weeks post-treatment completion).

We will sample intestinal microbiota using a microbiome sampling capsule in Healthy, Irritable Bowel Syndrome (IBS), and Functional Gastrointestinal Disease.

GI disorders are influenced by the gut microbiome. To date, sampling of the small intestine in GI disorders has been limited. The investigators plan to sample the small intestinal contents during endoscopy for research purposes.

Ethosuximide and pentoxifylline in the treatment of abdominal pain related to irritable bowel syndrome