Comparison of MAG and Fish Oil Efficacy

Inclusion Criteria: * Age 18-65 * Sex female * Body Mass Index (BMI) ≥ 30kg/m2 and \< 40kg/m2 * Subjects willing to undergo treatment with Orlistat® (Xenical). * Having obtained her written informed consent before any study related procedure including the pre-inclusion period. Subject exclusion criteria: * Binge eating disorder * Any other weight loss treatment(s) within the last 3 months * Vegetarians * History of metabolic, cardiovascular, hepatic or renal diseases * Obstructed bile duct * Diseases that could interfere with intestinal absorption History of abdominal / gastric surgery (except appendicectomy) * Use of drugs or illicit substances * Consumption of alcohol \> 50 gr/week * Any other clinically significant abnormalities on screening laboratory evaluation (creatinine, Na, K, urique acide, ASAT, ALAT, Ph. Alc., yGT, Glycemia, total cholesterol, HDL, LDL, triglycerides) concentrations \> 2.5 fold normal range * Pregnant or lactating mothers * Allergy to fish oil or other components (for e.g., gelatin or excepients of the capsule) * Use of any other supplements containing fish oil for the duration of the trial or 3 month before inclusion in trial. * Smokers * Having donated blood or had a transfusion of blood/blood products during the trial and 3 months prior to screening or expected to do so during the study * Bleeding disorders * Subject who cannot be expected to comply with the study procedures. * Currently participating or having participated in another clinical trial during last 8 weeks prior to the beginning of this study.