Far infrared radiation induces changes in gut microbiota and activates GPCRs in mice.

•Transient exposure of FIR induced compositional and temporal changes in gut microbiota of mice.•FIR exposure stimulated growth of the gut beneficial bacteria.•FIR exposure promoted growth of the gut SCFAs-producing bacteria.•FIR treatment upregulated the expressions of the SCFAs-sensing G-protein coupled receptors in the intestinal mucous of the mice.