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A structured search of PubMed, Scopus, and Web of Science (2000\u20132025) identified 1707 records; 21 studies met inclusion criteria. Available evidence suggests that although MBS reduces obesity-related inflammation and oxidative burden in many patients, a proportion of individuals may present with persistent redox imbalance, elevated D-dimer or vWF (von Willebrand Factor), and delayed normalization of fibrinolysis. Micronutrient deficiencies\u2014particularly vitamins K, B12, folate, selenium, zinc, and copper\u2014are common after malabsorptive procedures and contribute to both thrombotic and hemorrhagic complications by impairing antioxidant defenses, endothelial function, and vitamin K-dependent coagulation pathways. Postoperative venous thromboembolism (VTE) incidence ranges from 0.3 to 0.5%, with higher risk after Roux-en-Y gastric bypass than sleeve gastrectomy, while bleeding is primarily associated with vitamin K deficiency, marginal ulcers, and anticoagulant exposure. The findings underscore the interdependence of oxidative stress, nutritional status, and hemostasis after MBS. Individualized thromboprophylaxis, routine detection of micronutrient deficiencies, and long-term biochemical monitoring are essential to maintain hemostatic stability. Standardized redox\u2013hemostasis biomarker panels are needed to clarify mechanistic pathways and improve postoperative preventive strategies.<\/jats:p>","DOI":"10.3390\/antiox15010124","type":"journal-article","created":{"date-parts":[[2026,1,19]],"date-time":"2026-01-19T08:23:56Z","timestamp":1768811036000},"page":"124","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Oxidative Stress, Micronutrient Deficiencies and Coagulation Disorders After Bariatric Surgery: A Systematic Review"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-0081-6341","authenticated-orcid":false,"given":"Katarzyna","family":"Giedzicz","sequence":"first","affiliation":[{"name":"2nd Clinical Department of General, Gastroenterological and Oncological Surgery, Medical University of Bialystok, 15-089 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-7271-9025","authenticated-orcid":false,"given":"Przemys\u0142aw","family":"Zubrzycki","sequence":"additional","affiliation":[{"name":"2nd Clinical Department of General, Gastroenterological and Oncological Surgery, Medical University of Bialystok, 15-089 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5265-6245","authenticated-orcid":false,"given":"Aleksander","family":"\u0141ukaszewicz","sequence":"additional","affiliation":[{"name":"2nd Clinical Department of General, Gastroenterological and Oncological Surgery, Medical University of Bialystok, 15-089 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3952-3154","authenticated-orcid":false,"given":"Paulina","family":"G\u0142uszy\u0144ska","sequence":"additional","affiliation":[{"name":"2nd Clinical Department of General, Gastroenterological and Oncological Surgery, Medical University of Bialystok, 15-089 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0838-3478","authenticated-orcid":false,"given":"Hady Razak","family":"Hady","sequence":"additional","affiliation":[{"name":"2nd Clinical Department of General, Gastroenterological and Oncological Surgery, Medical University of Bialystok, 15-089 Bialystok, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,18]]},"reference":[{"key":"ref_1","unstructured":"World Obesity Federation (2025, November 09). 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