Gastric BypassBariatric SurgeryObesity, MorbidGastroplastyAnastomosis, Roux-en-YWeight LossBiliopancreatic DiversionLaparoscopyObesityPostoperative ComplicationsGlucagon-Like Peptide 1HyperoxaluriaPostoperative PeriodGastric FistulaPeptide YYBariatric MedicineAvitaminosisBody Mass IndexTreatment OutcomeJejunoileal BypassPreoperative PeriodJejunostomySurgical StaplersSteatorrheaIncretinsJejunumStomachPostoperative CareDiabetes Mellitus, Type 2Follow-Up StudiesGastrectomyProspective StudiesMalabsorption SyndromesGastric Inhibitory PolypeptideReoperationGastrostomyHerniaAppetite RegulationGastrointestinal HormonesGhrelinTime FactorsAnastomotic LeakBlood GlucoseOmentumFood PreferencesCoronary Artery Bypass, Off-PumpRetrospective StudiesCaloric RestrictionBariatricsComorbidityPostprandial PeriodDumping SyndromeSurgical StaplingJejunal DiseasesAnastomosis, SurgicalConstriction, PathologicBody WeightLength of StayNesidioblastosisInsulin ResistanceCandyPreoperative CareNephrolithiasisRisk FactorsSatiety ResponseSuture TechniquesFeeding BehaviorHernia, AbdominalEatingGastrointestinal TractGastroenterostomyVascular PatencyCalcium CitrateSaphenous VeinPleasure