{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T18:30:33Z","timestamp":1775068233996,"version":"3.50.1"},"reference-count":60,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T00:00:00Z","timestamp":1718668800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JPM"],"abstract":"<jats:p>Obesity is a worldwide epidemic, and bariatric surgery is considered the primary treatment for long-term weight loss and managing obesity-related health issues. Sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB) are the most performed procedures. Nutritional deficiencies are a significant concern following bariatric surgery and can have serious consequences. This study aims to compare the incidence of nutritional deficiencies in patients undergoing RYGB and SG. A retrospective analysis was conducted on the nutritional status of 505 consecutive patients who underwent either RYGB or SG between January and December 2019. Data were collected regarding vitamin B12, folic acid, vitamin D, calcium, PTH, magnesium, hemoglobin, iron, ferritin, and transferrin at preoperative, 6-month, and 12-month intervals post-surgery. The RYGB group showed significantly higher excess weight loss. Vitamin B12, hemoglobin, and ferritin levels were consistently higher in the SG group throughout the study. Vitamin D deficiency was prevalent, with no significant difference between the groups. Vitamin B12 deficiency was significantly more common in the RYGB group (6 months: 17.46% vs. 4.69%, p &lt; 0.001; 12 months: 16.74% vs. 0.93%, p &lt; 0.001). Despite differences in their mechanisms, bariatric surgeries were associated with nutritional deficiencies. It is crucial to efficiently assess, prevent, and manage these deficiencies tailored to each surgical procedure.<\/jats:p>","DOI":"10.3390\/jpm14060650","type":"journal-article","created":{"date-parts":[[2024,6,18]],"date-time":"2024-06-18T07:33:20Z","timestamp":1718696000000},"page":"650","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Assessing Nutritional Deficiencies in Bariatric Surgery Patients: A Comparative Study of Roux-en-Y Gastric Bypass versus Sleeve Gastrectomy"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4202-3000","authenticated-orcid":false,"given":"Jos\u00e9 P.","family":"Vieira de Sousa","sequence":"first","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Surgery Department, S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6176-5654","authenticated-orcid":false,"given":"Hugo","family":"Santos-Sousa","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Obesity Integrated Responsibility Unit (CRI-O), S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"given":"Sofia","family":"Vieira","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"}]},{"given":"Rita","family":"Nunes","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0539-6003","authenticated-orcid":false,"given":"Jorge","family":"Nogueiro","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Surgery Department, S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"given":"Andr\u00e9","family":"Pereira","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Surgery Department, S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"given":"Fernando","family":"Resende","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Obesity Integrated Responsibility Unit (CRI-O), S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8774-5771","authenticated-orcid":false,"given":"Andr\u00e9","family":"Costa-Pinho","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Obesity Integrated Responsibility Unit (CRI-O), S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"given":"John","family":"Preto","sequence":"additional","affiliation":[{"name":"Obesity Integrated Responsibility Unit (CRI-O), S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1277-3401","authenticated-orcid":false,"given":"Bernardo","family":"Sousa-Pinto","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"MEDCIDS\u2014Department of Community Medicine, Information and Health Decision Sciences, Faculty of Medicine, University of Porto, 4200-450 Porto, Portugal"},{"name":"CINTESIS\u2014Center for Health Technology and Services Research, 4200-450 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6409-1894","authenticated-orcid":false,"given":"Silvestre","family":"Carneiro","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Surgery Department, S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]},{"given":"Eduardo","family":"Lima-da-Costa","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal"},{"name":"Obesity Integrated Responsibility Unit (CRI-O), S\u00e3o Jo\u00e3o University Medical Center, 4200-319 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,6,18]]},"reference":[{"key":"ref_1","unstructured":"World Health Organization (2024, May 02). 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