华西医院最新Nature Aging论文：补充这种氨基酸衍生物，能够减脂增肌，助力健康老龄化

Core Viewpoint - The study reveals the metabolic heterogeneity of sarcopenia and identifies N-methylglycine as a potential risk factor for sarcopenia, suggesting its supplementation could be a new strategy for intervention [3][6][8]. Group 1: Research Findings - The research team conducted a comprehensive plasma metabolomics and lipidomics analysis on two cohorts comprising 1,013 individuals, highlighting a significant decrease in plasma N-methylglycine levels in elderly and sarcopenic patients [6][8]. - In mouse experiments, exogenous supplementation of N-methylglycine was shown to promote anti-inflammatory macrophage polarization, effectively reducing fat accumulation during aging while maintaining skeletal muscle quality at a higher level [3][6]. - The study demonstrated that N-methylglycine activates the GCN2 signaling pathway, enhancing anti-inflammatory macrophage polarization, promoting thermogenesis in adipose tissue, and facilitating muscle regeneration [6][8]. Group 2: Clinical Implications - The research provides scientific evidence for the potential clinical translation of N-methylglycine supplementation as a strategy to prevent sarcopenia in the elderly [3][8]. - The findings suggest that N-methylglycine supplementation can significantly increase fat thermogenesis, reduce white fat, and enhance lean body mass, emphasizing its role in muscle damage repair [8].