Study of the Link Between MASH ( Metabolic Dysfunction-Associated Steatohepatitis) and MAMs (Mitochondria-Associated Membranes ) Alteration in Patients Undergoing Bariatric Surgery - MAMBA

* Inclusion Criteria \* : * Female or male adult patients * Patient who has benefited from a pluridisciplinary evaluation (medical, surgical, psychiatric), with a favorable opinion for a sleeve gastrectomy or a gastric bypass. * Patient with an indication Indication for intraoperative liver biopsy due to suspected MASH * Patient who agrees to be included in the study and who signs the informed consent form, * Patient affiliated to a healthcare insurance plan. * Exclusion Criteria \* : * Patient presenting Hepatitis B as defined as presence of hepatitis B surface antigen (HBsAg). * Patient presenting previous or current infection with Hepatitis C * Autoimmune hepatitis as defined by anti-nuclear antibody (ANA) of 1:160 or greater and liver histology consistent with autoimmune hepatitis or previous response to immunosuppressive therapy. * Patient presenting Autoimmune cholestatic liver disorders as defined by elevation of alkaline phosphatase and anti-mitochondrial antibody of greater than 1:80 or liver histology consistent with primary biliary cirrhosis or elevation of alkaline phosphatase and liver histology consistent with sclerosing cholangitis. * Patient presenting Wilson disease as defined by ceruloplasmin below the limits of normal and liver histology consistent with Wilson disease. * Patient presenting Alpha-1-antitrypsin deficiency as defined by alpha-1-antitrypsin level less than normal and liver histology consistent with alpha-1-antitrypsin de…