Beyond Weight Loss: Skeletal Considerations in Obesity Treatment.

This narrative review examines the skeletal consequences of modern obesity treatments, particularly glucagon-like peptide-1 receptor agonists (GLP-1RAs) and bariatric/metabolic surgery. The authors challenge the historical assumption that obesity is bone-protective due to mechanical loading, citing emerging evidence of qualitative bone deterioration and site-specific fracture risks in individuals with obesity. The review synthesizes findings showing that intentional weight loss via caloric restriction or bariatric surgery consistently accelerates bone turnover and reduces bone mineral density (BMD), with surgical approaches carrying the most pronounced skeletal impact. Regarding GLP-1RAs, the authors report that available data suggest modest BMD declines largely proportional to the degree of weight loss, potentially driven by mechanical unloading. Interestingly, the review also notes that preclinical studies suggest GLP-1 signaling may have direct osteoanabolic and anti-resorptive properties, though these effects remain to be confirmed in humans. The authors recommend integrating resistance exercise, adequate calcium, vitamin D, and protein intake, and skeletal monitoring for high-risk patients into obesity care. Limitations include reliance on heterogeneous primary literature and the absence of long-term fracture outcome data for newer pharmacological agents.

Why this grade: This is a narrative review synthesizing existing preclinical and clinical literature; it does not generate original primary data and its conclusions depend on the quality and consistency of the underlying studies reviewed.