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
You may not be if
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
Clareo Health | Impact of a Pro-diversity Gut Microbiota Diet After a Bariatric Surgery on Gut Microbiota, Eating Behaviour and Sensory Function
