Engineered Lactate Catabolizing Probiotics Reveal Timescale Dependent Microbiome-Host Metabolic Coupling
This study demonstrates that engineered *Bacillus subtilis* probiotics expressing lactate oxidase can acutely improve host energy balance and sepsis survival by rewiring microbiome metabolism toward anabolic processes, but these beneficial effects fail to persist chronically due to homeostatic compensation, highlighting a clear timescale-dependent limit to gut-centric metabolic therapies.