A microbial sugar tips the metabolic scales.

A Clostridium immunis-derived exopolysaccharide reduces interleukin-22 signaling to reshape visceral adipose immunometabolism and link microbial chemistry to host energy balance.

• Why it matters: Obesity and metabolic disorders are associated with the microbiome, yet the specific microbial pathways that alter host metabolic regulation are not well defined.
• What they did: Tan et al. identify a Clostridium immunis exopolysaccharide and test how it affects interleukin-22 signaling and immunometabolism in visceral adipose tissue.
• The result: The work shows that microbial chemistry can modulate host immune-metabolic signaling, implying a mechanistic route from microbiome-derived molecules to energy balance.

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