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This study looks at how a diet designed to increase gut microbiota diversity after bariatric (obesity) surgery affects gut microbiota, eating behavior, and sensory function, delivered through nutritional counseling. It enrolls people aged 25 to 65 with severe obesity who are undergoing sleeve gastrectomy or Roux-en-Y gastric bypass. It is a study with no assigned phase and is currently recruiting participants.
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Inclusion Criteria: * Between 25 and 65 years old * Undergoing either sleeve gastrectomy or Roux-en-Y gastric bypass * With grade 3 obesity (BMI≥40 kg/m²) or with BMI≥35 kg/m² and at least one comorbidity likely to be improved after surgery, with the exception of type 2 diabetes * Signed consent form * Living less than an hour and 30 minutes from the hospital * Presence of effective and stable contraception for women of childbearing potential Exclusion Criteria: * Type 2 diabetes * Presence of a contraindication to bariatric surgery * Presence of gastrointestinal pathologies with an inflammatory component, known gastroparesis, total gastrectomy, colectomy, exocrine pancreatic insufficiency, known endocrine pathologies inducing hyperglycaemia (uncontrolled dysthyroidism, acromegaly, hypercorticism, etc.), severe chronic renal insufficiency (\< 30mL/min), or hepatocellular insufficiency * Claustrophobic * Pregnant or breastfeeding women * Taking an obesity treatment 3 months before surgery * Taking a corticoids, immunosuppression, anabolizing, or growing hormones, antibody treatments less than 3 months before inclusion * Daily taking of laxatives or drugs that can strongly interfere with the composition of the intestinal microbiota. If taken sporadically, the patient can be included at a distance (3 weeks) from the laxatives taken. * Specific diets (vegetarian, vegan or without gluten) * No French speaker * Already included in other study * Donated blood in the last two months * Without freezer access * With allergy or intolerance to food propose in ad libitum buffet