GCG and type 2 diabetes mellitus: Our epidemiological study showed that the intestinal flora of Uygurs and Kazak T2DM patients differed from that of normal glucose-tolerant people [5] and found that normal glucose-tolerant Kazak faecal microbiota transplantation could improve glycolipid disorders by changing the bacterial composition responsible for producing SCFAs and activating the GPR43/GLP-1 pathway [6].