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00925njm 22002777a 4500 dc Martínez-Ortega, Antonio J. author Olveira, Gabriel author Pereira-Cunill, José L. author Arraiza-Irigoyen, Carmen author García-Almeida, José M. author Irles Rocamora, José A. author Molina-Puerta, María J. author Molina Soria, Juan B. author Rabat-Restrepo, Juana M. author Rebollo-Pérez, María I. author Serrano-Aguayo, María P. author Tenorio-Jiménez, Carmen author Vílches-López, Francisco J. author García-Luna, Pedro P. author 2020-07-06 In 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. 10.3390/nu12072002 2072-6643 Nutrients http://hdl.handle.net/10668/3671 32640531 http://hdl.handle.net/20.500.12105/18072 Bariatric surgery Obesity Nutrient deficiency Cirugía bariátrica Obesidad Enfermedades carenciales Dieta Micronutrientes Recommendations Based on Evidence by the Andalusian Group for Nutrition Reflection and Investigation (GARIN) for the Pre- and Postoperative Management of Patients Undergoing Obesity Surgery