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Updated: Oct 18, 2025

Frailty Assessment in an Aging Mouse Model
Published on: September 23, 2025
Protein Nutritional Status and Frailty: A Mendelian Randomization Study.
Yasutake Tomata1,2, Yunzhang Wang1, Sara Hägg1
1Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden.
Better protein nutritional status may help prevent frailty. This Mendelian randomization study found higher serum total protein was linked to lower frailty risk in both men and women.
Area of Science:
- Nutritional biochemistry and gerontology.
- Genetic epidemiology and statistical genetics.
Background:
- Observational studies suggest a link between protein nutrition and frailty prevention.
- The precise causal relationship requires further investigation.
Purpose of the Study:
- To investigate the hypothesis that improved protein nutritional status reduces frailty risk.
- Utilizing Mendelian randomization (MR) to assess causality.
Main Methods:
- A two-sample MR study using UK Biobank GWAS summary statistics.
- Genetically predicted serum albumin and total protein as exposure variables.
- Rockwood frailty index (FI) comprising 49 deficits as the outcome measure.
Main Results:
- Genetically predicted serum albumin showed a preventive association with FI in women (P=0.041).
- Genetically predicted serum total protein was inversely associated with FI in the full sample (P=0.002).
- Higher serum total protein significantly reduced FI in both men and women (P<0.05).
Conclusions:
- Mendelian randomization analysis supports a modest contribution of protein nutritional status to frailty reduction.
- Findings suggest that optimizing protein intake may be a strategy for mitigating frailty risk.
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