Banded Versus Conventional Laparoscopic Roux-en-Y (GABY)

Inclusion Criteria: * BMI ≥ 40 kg /m2 to ≤ 50 kg/m2 * Eating habit: sweet eater and volume eater * Signed informed consent * Patients with one or more of the following comorbidities: Hypertension, Diabetes mellitus Type 2, Hyperlipidemia, Hyperuricemia, Sleep apnea, Degenerative diseases of: Spine osteochondrosis, hip, knee, feet Exclusion Criteria: * History of obesity surgery * History of major abdominal surgery with consecutive malabsorption (no resections of the stomach, small and large bowel (exception: appendectomy) * Patients not eligible to implement silastic ring size 6.5 cm * History of drug or alcohol abuse * History of major psychiatric illness conflicting with patient's compliance * History of recent or chronic steroid medication * Autoimmune disease * Inflammatory bowel disease or malabsorptive disease * Liver cirrhosis (CHILD B + C) * Active viral or bacterial disease (e.g. HIV, Hepatitis B or C, Tbc etc.) * Pregnant women or women with childbearing potential without efficient contraception * History of cancer in the last five years * Need of long-term anticoagulant medication for any reason * Any medication with ingredient ASA