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Beyond body mass index: the role of muscle strength in reducing mortality risk in older adults with severe obesity – multi-country cohort study

Abstract

Background/Objective

Since muscle strength is modifiable and handgrip strength is a reliable biomarker for strength and mortality, exploring its association with mortality in individuals with severe obesity could help identify protective thresholds. We aimed to examine the dose-response association between handgrip strength and mortality in adults with severe obesity.

Subjects/Methods

We retrieved data from the Survey of Health, Ageing and Retirement in Europe (SHARE). Handgrip strength was measured in participants with a body mass index (BMI) higher than 40 kg/m2. We used time-varying Cox proportional hazards regression to assess the association between handgrip strength and all-cause mortality risk. To account for potential non-linearity, we employed restricted cubic splines. We examined a total of 2229 adults (67.9% women; BMI of 43.8 kg/m2).

Results

We found an association between handgrip strength and mortality, showing a minimal and optimal dose for a reduced risk with 31 kg (HR 0.97, 95% CI, 0.96–0.99) and 36 kg (HR 0.90, 95% CI, 0.81–0.99), respectively. Additional sex-stratified analysis showed that lower than median levels of handgrip strength were gradually associated with increased risk in both men and women.

Conclusions

The association between handgrip strength and all-cause mortality in European adults with severe obesity highlights practical thresholds for risk reduction, with 31 kg as the minimum and 36 kg as the optimal strength level. In both men and women, handgrip strength below the median was linked to a gradual increase in mortality risk, emphasizing the importance of maintaining adequate muscle strength to improve health outcomes.

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Fig. 1
Fig. 2: Dose-response association (Adjusted hazard ratios and associated 95% confidence interval band) between handgrip strength (Kg) and all-cause mortality.
Fig. 3: Dose-response association (Adjusted hazard ratios and associated 95% confidence interval band) between handgrip strength (Kg) and all-cause mortality in men.
Fig. 4: Dose-response association (Adjusted hazard ratios and associated 95% confidence interval band) between handgrip strength (Kg) and all-cause mortality in women.

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Data availability

Data described in the manuscript can be accessed through an application to the SHARE database. Code book and analytic code will be made publicly and freely available upon reasonable request to the corresponding author.

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Acknowledgements

We acknowledge the participants for their contribution.

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Contributions

ATB, JC, and LLA contributed to the study conception and design. Material preparation and data collection were performed by LLA. Data analysis was performed by LLA. The first draft of the manuscript was written by ATB, and all authors commented on previous versions of the manuscript. All the authors have read and approved the final manuscript.

Corresponding author

Correspondence to Rubén López-Bueno.

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Competing interests

The authors declare no competing interests.

Ethical approval

The SHARE project, operating under the umbrella of the Max Planck Society since 2011, has had its research-ethical assessments reviewed and approved by the Ethics Council of the Max Planck Society, which carefully evaluated the project’s design and subprojects, including the SHARE Corona Survey and the collection of dried blood spots, ensuring compliance with ethical research principles.

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Tur-Boned, A., Andersen, L.L., López-Bueno, R. et al. Beyond body mass index: the role of muscle strength in reducing mortality risk in older adults with severe obesity – multi-country cohort study. Eur J Clin Nutr 79, 787–792 (2025). https://doi.org/10.1038/s41430-025-01616-y

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