Preoperative Dry Lean Body Mass as a Prognostic Factor for Excess Weight Loss After Bariatric Surgery.

Preoperative Dry Lean Body Mass as a Prognostic Factor for Excess Weight Loss After Bariatric Surgery.

Bariatric surgery is currently the only method that has proven long-term effectiveness in obesity. Although the benefit of physical activity on weight loss has been demonstrated, no correlation has ever been reported between preoperative lean body mass and postoperative weight loss. Dry lean mass is probably an essential prognostic factor for the effectiveness of bariatric surgery.

The main objective of this study is to define a preoperative dry lean body mass threshold as a worst prognostic factor for weight loss one year after bariatric surgery.

The management of patients included in this study was modelled on the management usually offered to patients followed for the same pathology in the diabeto-endocrinology department. There are no study-specific examinations that are not part of current practice.

Inclusion Criteria:

• BMI ≥ 40 or BMI ≥ 35 kg/m2 and a complication that can be improved after bariatric surgery: cardiovascular disease including hypertension, severe metabolic disorder including type 2 diabetes, sleep apnea syndrome or other severe respiratory disorder, hepatic steatosis, disabling osteoarticular disease.
• Patient requiring bariatric surgery (sleeve-gastrectomy or gastric bypass)
• Patient who has agreed to participate in the study
• Patient with social security coverage.

Exclusion Criteria:

• Patient with a contraindication to bariatric surgery (cognitive or psychological disorders, severe eating disorders, addiction to alcohol or psychoactive substances, contraindication to general anaesthesia, multiple history of digestive surgery, high risk of undernutrition (progressive cancer, chronic inflammatory bowel disease, cirrhosis, severe renal insufficiency...)
• Pregnant or lactating women
• Minor patient
• Major patient under tutorship, curatorship, or deprived of liberty
• Patient unable to understand protocol and / or give express consent
• Patient not affiliated with a social security system or beneficiary of such a scheme
• Patient participating in an intervention-type clinical research protocol likely to modify the evaluations of this protocol
• adults under the protection of justice