Martínez-Ortega, Antonio J.Olveira, GabrielPereira-Cunill, José L.Arraiza-Irigoyen, CarmenGarcía-Almeida, José M.Irles Rocamora, José A.Molina-Puerta, María J.Molina Soria, Juan B.Rabat-Restrepo, Juana M.Rebollo-Pérez, María I.Serrano-Aguayo, María P.Tenorio-Jiménez, CarmenVílches-López, Francisco J.García-Luna, Pedro P.2024-02-122024-02-122020-07-06http://hdl.handle.net/10668/3671http://hdl.handle.net/20.500.12105/18072In order to develop evidence-based recommendations and expert consensus for nutrition management of patients undergoing bariatric surgery and postoperative follow-up, we conducted a systematic literature search using PRISMA methodology plus critical appraisal following the SIGN and AGREE-II procedures. The results were discussed among all members of the GARIN group, and all members answered a Likert scale questionnaire to assess the degree of support for every recommendation. Patients undergoing bariatric surgery should be screened preoperatively for some micronutrient deficiencies and treated accordingly. A VLCD (Very Low-Calorie Diet) should be used for 4-8 weeks prior to surgery. Postoperatively, a liquid diet should be maintained for a month, followed by a semi-solid diet also for one month. Protein requirements (1-1.5 g/kg) should be estimated using adjusted weight. Systematic use of specific multivitamin supplements is encouraged. Calcium citrate and vitamin D supplements should be used at higher doses than are currently recommended. The use of proton-pump inhibitors should be individualised, and vitamin B12 and iron should be supplemented in case of deficit. All patients, especially pregnant women, teenagers, and elderly patients require a multidisciplinary approach and specialised follow-up. These recommendations and suggestions regarding nutrition management when undergoing bariatric surgery and postoperative follow-up have direct clinical applicability.engVoRhttp://creativecommons.org/licenses/by/4.0/Bariatric surgeryObesityNutrient deficiencyCirugía bariátricaObesidadEnfermedades carencialesDietaMicronutrientesEvidence-Based MedicineHumansObesity, MorbidTreatment OutcomeBariatric SurgeryDeficiency DiseasesPostoperative ComplicationsAttribution 4.0 International3264053110.3390/nu120720022072-6643Nutrientsopen access