GCG and diabetes mellitus: In a new review of the literature by Mohammadi et al. the effect of curcumin on glucagon-like peptide-1 (GLP-1), dipeptidyl peptidase-4 (DPP-4), glucose transporters, α-glycosidase, α-amylase, and peroxisome proliferator -activated gamma receptor (PPARγ) were investigated in addition to the standard biomarkers of diabetes described above.