Kim et al. 2026 — taurine and frailty heterogeneity
TL;DR
In 146 Baltimore-area adults, chronological age alone was not associated with circulating taurine. Among older adults, robust participants had the highest taurine, prefrail participants the lowest, and frail participants intermediate levels. The non-monotonic pattern offers a plausible biological contributor to cross-study disagreement, but it is observational and does not show that supplementation reverses frailty.
Design
- Young adults ages 20–50: n=45.
- Older adults age ≥69: robust n=40, prefrail n=30, frail n=27.
- Untargeted serum metabolomics; volume-normalized, sex-adjusted, log2-transformed and scaled intensities.
- Fried frailty phenotype plus TNF-α, TNF-αR1, and IL-6 analyses.
Key results
- Young versus older taurine did not differ significantly (p=0.29).
- Taurine differed across older frailty groups (Kruskal–Wallis p=2.8×10^-10): robust highest, prefrail lowest, frail intermediate.
- A significant inverse taurine–TNF-α association appeared specifically in prefrail participants; the other inflammatory associations were not significant after correction.
Limitations
- Cross-sectional, modest sample, and single geographic population.
- Dietary taurine and supplement use were not measured.
- The proposed pathway “flux” and compensation explanations are inferences from relative metabolite patterns, not direct isotope-flux measurements.
- Younger adults were not assessed for frailty.