GCG and type 1 diabetes mellitus: Intrigued by the well‐established role of butyrate in suppressing inflammation, stimulating secretion of enteroendocrine hormones35 and conserving beta cell functions in T1DM,36 we measured serum inflammatory cytokines (interleukin [IL]‐1β, IL‐4, IL‐6, IL‐7, IL‐10, IL‐17A, IL‐18, interferon gamma, tumor necrosis factor‐α, and TGF‐β1) (Figure S5), plasma enteroendocrine hormones (GLP‐1, GLP‐2, and PYY) during the SBMT (Figure S6), and serum C‐peptide (Table 1).