Association of sarcopenic obesity with dementia risk in a cohort of older women

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BACKGROUND AND AIMS: Longitudinal studies have explored the association between sarcopenic obesity (SO) and the risk of cognitive impairment, yet findings remain mixed. This study aimed to investigate the associations of SO with risk of incident dementia in older women, using two diagnostic models: the Sarcopenic Obesity Global Leadership Initiative (SOGLI) and the load-capacity model. METHODS: We analysed data from 900 community-dwelling women (aged ≥70 years). SO was defined using two models: (1) the SOGLI criteria, based on low handgrip strength (HGS), low appendicular lean soft tissue to body weight (ALST/W) ratio, and high fat mass percentage (%FM); and (2) the load-capacity model, based on a high truncal fat mass to ALST (TrFM/ALST) ratio. Incident dementia events (hospitalisation and/or death) over 9.5 years were identified through linked health records using International Classification of Diseases (ICD) codes. Cox proportional hazards and Fine-Gray sub-distribution models were applied. RESULTS: (n = 67) or %FM below the 15th percentile (n = 135), and after further adjustment for age at highest education level.. CONCLUSION: This is the first longitudinal study to examine the association between SO and dementia using either the SOGLI or load-capacity models. In this cohort of older women, SO was associated with a lower risk of dementia-related hospitalisation. These findings suggest that the relationship between obesity and dementia risk in late life may differ from current evidence regarding midlife, indicating potential age-specific effects. Further research is needed to clarify the underlying mechanisms and generalisability of these observations to broader populations..

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