Thigh muscle fat infiltration, measurable by MRI, associates with increased all-cause mortality and disease across multiple organ systems, with effects mediated by lifestyle factors. Multi-omics analysis identifies 79 genetic variants, specific cell types, tissue-specific gene expression patterns, and circulating biomarkers that mechanistically link muscle composition to systemic health outcomes.
Key Points
- Higher thigh muscle fat infiltration predicts mortality and system-wide disease risk
- Lifestyle factors mediate 6.7–71.7% of TMFI effects on health outcomes
- Myogenic cells, specific gene expression, and circulating proteins drive TMFI pathology
Longevity Analysis
Muscle quality—not size alone—emerges as a quantifiable predictor of lifespan and disease burden across cardiovascular, metabolic, and systemic categories. The finding that lifestyle factors substantially mediate TMFI's health impact positions muscle composition as a measurable hub where behavioral choices (diet, movement, recovery) translate into molecular and structural change. Identifying circulating biomarkers and tissue-specific gene expression patterns creates opportunities to monitor and intervene on this pathway before overt disease appears, shifting muscle quality from an aesthetic consideration to a core longevity parameter.
Original published by Wiley Aging Cell, by Yiwei Zhang, Qin Dang, Xizeng Zong, Haowei Chen, Simin Wen, Siqi Xu, Kunyan Wang, Xiaoshuai Wang, Jianwei Zhu, Zhaohua Zhu, Changhai Ding, Guangfeng Ruan, Yan Zhang .