摘要Intramuscular fat(IMF)content serves as the key determinants of meat quality.Emerging evidence indicates that gut microbiota and their metabolites significantly influence IMF deposition levels by modulating host lipid metabo-lism through multiple pathways,positioning microbial regulation as a pivotal target for meat quality improvement.However,existing studies remain fragmented,predominantly focusing on isolated mechanisms or correlations without a systematic view of the regulatory network.This review consolidates the core mechanisms through which microbiota-derived metabolites including short-chain fatty acids,bile acids,branched-chain amino acids,trimeth-ylamine N-oxide,tryptophan derivatives,succinate,polyamines etc.,regulate IMF deposition and proposes a tar-geted intervention framework,the"gut microbiota/metabolites-IMF axis".By integrating these insights,we provide a theoretical foundation and define practical research pathways to assess the potential of microbial-based strategies for improving meat quality in swine production.