GCG and type 2 diabetes mellitus: T2D: type 2 diabetes; HbA1c: glycosylated hemoglobin; HOMA-IR: homeostatic model assessment of insulin resistance; LDL: low-density lipoprotein; HDL: high-density lipoprotein; MR FFM: magnetic resonance fat fraction mapping; GLP-1: glucagon-like peptide 1.