{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T22:47:03Z","timestamp":1793227623735,"version":"4.5.0"},"reference-count":131,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T00:00:00Z","timestamp":1779840000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Metabolites"],"abstract":"<jats:p>Background\/Objectives: GLP-1-based obesity pharmacotherapy has shifted clinical attention from the magnitude of weight loss to the quality of weight loss. This review evaluates whether body composition changes during treatment with GLP-1-based agents represent clinically meaningful muscle loss and identifies nutrition, supplementation, exercise, and monitoring strategies that may help preserve lean mass, function, bone health, and nutritional adequacy. Methods: A comprehensive narrative review was performed using focused searches of PubMed, publisher-hosted journal platforms, and reference lists of key primary studies and recent evidence syntheses through March and May 2026. Evidence was organized around body composition, muscle quality and function, dietary protein and micronutrient adequacy, exercise, supplementation, bioelectrical impedance analysis, imaging, and emerging biomarkers. Results: Semaglutide and tirzepatide preferentially reduce fat mass, including visceral and ectopic adiposity, while producing smaller but consistent reductions in lean mass or lean soft tissue. However, DXA-derived lean mass and BIA-derived fat-free mass are not equivalent to skeletal muscle, and lean tissue loss does not necessarily indicate impaired strength or physical performance. The most defensible supportive care model combines food-first nutritional counseling, adequate protein intake, structured resistance exercise, management of gastrointestinal adverse effects, and risk-based monitoring of micronutrient inadequacy. Protein supplementation and nutritionally complete meal replacements may be useful when intake is insufficient, whereas creatine, essential amino acids or leucine, beta-hydroxy-beta-methylbutyrate, fiber, probiotics, omega-3 fatty acids, and multi-ingredient products remain adjunctive options supported mainly by indirect or phenotype-specific evidence. Conclusions: Future GLP-1 trials and clinical care should move beyond body weight and total lean mass toward integrated assessment of muscle quantity, muscle quality, function, bone, and nutritional adequacy, and standardized BIA-based clinical monitoring where advanced imaging is not feasible.<\/jats:p>","DOI":"10.3390\/metabo16060364","type":"journal-article","created":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T12:31:56Z","timestamp":1779885116000},"page":"364","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Lean Mass and Musculoskeletal Preservation in GLP-1-Based Obesity Treatment: Nutrition, Exercise, Supplementation, and Monitoring Strategies"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-3112-0656","authenticated-orcid":false,"given":"Roko","family":"\u0160anti\u0107","sequence":"first","affiliation":[{"name":"Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia"},{"name":"Laboratory for Cardiometabolic Research, University of Split School of Medicine, Soltanska 2A, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lovre","family":"Martinovi\u0107","sequence":"additional","affiliation":[{"name":"Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3452-389X","authenticated-orcid":false,"given":"Nikola","family":"Pavlovi\u0107","sequence":"additional","affiliation":[{"name":"Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia"},{"name":"Laboratory for Cardiometabolic Research, University of Split School of Medicine, Soltanska 2A, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7018-4947","authenticated-orcid":false,"given":"Doris","family":"Ru\u0161i\u0107","sequence":"additional","affiliation":[{"name":"Department of Pharmacy, University of Split School of Medicine, Soltanska 2A, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9696-3359","authenticated-orcid":false,"given":"Marko","family":"Kumri\u0107","sequence":"additional","affiliation":[{"name":"Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia"},{"name":"Laboratory for Cardiometabolic Research, University of Split School of Medicine, Soltanska 2A, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2060-5130","authenticated-orcid":false,"given":"Dinko","family":"Martinovi\u0107","sequence":"additional","affiliation":[{"name":"Department of Maxillofacial Surgery, University Hospital of Split, Spinciceva 1, 21000 Split, Croatia"},{"name":"Department of Maxillofacial Surgery, University of Split School of Medicine, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-1179-2029","authenticated-orcid":false,"given":"Tina","family":"Ti\u010dinovi\u0107 Kurir","sequence":"additional","affiliation":[{"name":"Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia"},{"name":"Department of Endocrinology, Diabetes and Metabolic Diseases, University Hospital of Split, Spinciceva 1, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1634-0635","authenticated-orcid":false,"given":"Jo\u0161ko","family":"Bo\u017ei\u0107","sequence":"additional","affiliation":[{"name":"Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia"},{"name":"Laboratory for Cardiometabolic Research, University of Split School of Medicine, Soltanska 2A, 21000 Split, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"989","DOI":"10.1056\/NEJMoa2032183","article-title":"Once-Weekly Semaglutide in Adults with Overweight or Obesity","volume":"384","author":"Wilding","year":"2021","journal-title":"N. 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