Reframing obesity in aging people with HIV: sarcopenic obesity, muscle quality, and frailty

As people with HIV (PWH) age, obesity is increasingly prevalent, yet body weight alone inadequately captures the functional and metabolic consequences of adverse body composition remodeling. This review examines emerging evidence supporting a shift from weight-centric approaches toward a framework centered on sarcopenic obesity, muscle quality, and frailty in aging PWH.

Weight gain in the contemporary antiretroviral therapy era often reflects increased visceral and ectopic adiposity. Sarcopenic obesity is a clinically relevant phenotype characterized by the coexistence of excess adiposity and impaired muscle mass or function, with important implications for healthy aging. Emerging evidence highlights myosteatosis and impaired muscle quality as potential mechanistic links between adiposity and functional decline. Exercise-based interventions, particularly those incorporating resistance training, demonstrate promise for preserving physical function, reducing frailty, and improving body composition. In contrast, pharmacologic weight loss may raise concerns regarding lean tissue preservation if implemented without a concurrent focus on muscle health.

Obesity in aging PWH should be reframed as a body composition and functional health problem rather than simply excess body weight. Clinical and research priorities should emphasize early identification of vulnerability, preservation of muscle health, and interventions that support long-term physical resilience and independence.