Obesity, MorbidGastric BypassGastroplastyAnastomosis, Roux-en-YBiliopancreatic DiversionObesityBariatric SurgeryWeight LossLaparoscopyPostoperative ComplicationsBody Mass IndexSurgical StaplersAvitaminosisJejunoileal BypassJejunumStomachGastrectomyTreatment OutcomeBody WeightPostoperative PeriodFollow-Up StudiesGlucagon-Like Peptide 1Malabsorption SyndromesPostoperative CareDiabetes Mellitus, Type 2Prospective StudiesPeptide YYElephantiasisJejunostomyIleumBlood GlucoseTime FactorsLeptinSteatorrheaInsulin ResistanceGastric FistulaVitamin B DeficiencyComorbidityEatingReoperationHyperoxaluriaPrader-Willi SyndromeObesity, AbdominalRisk FactorsIncretinsRetrospective StudiesLength of StayInsulinMethodsPediatric ObesityAdipose TissueGastrostomyFood PreferencesAppetite RegulationGastric Inhibitory PolypeptideFatty LiverReceptors, LeptinDiabetes MellitusQuality of LifeCoronary Artery Bypass, Off-PumpPostprandial PeriodOmentumGhrelinHerniaSurgical Procedures, Minimally InvasivePrevalenceSurgical StaplingDigestive System Surgical ProceduresSatiety ResponseJejunal DiseasesPreoperative Period