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Despite the growing body of research, both original and review articles to date have been limited in their ability to provide a comprehensive and coherent explanation of the interrelationships among these three domains, largely due to methodological constraints. Accordingly, this study systematically reviewed a wide range of publi-cations addressing functional ability, depression, and social networks in older adults, with the aim of providing evidence-based insights to in-form strategies for maintaining well-being and preparing for functional decline in aging populations. The synthesized findings indicate that de-clines in functional ability, as reflected by impairments in IADL\/ADL, are associated with reduced instrumental ADL, increased depressive symp-toms, and decreased social participation, collectively contributing to a self-reinforcing cycle of functional and psychological deterioration. No-tably, this review demonstrates that while functional disability increases the risk of depression, robust social networks serve as protective fac-tors that mitigate both functional and psychological decline.<\/jats:p>","DOI":"10.12965\/jer.2550886.443","type":"journal-article","created":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T23:25:23Z","timestamp":1771889123000},"page":"9-21","update-policy":"https:\/\/doi.org\/10.12965\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Linkages between functional independence, depressive symptoms, and social networks in aging populations: a systematic 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