RBP4 and type 2 diabetes mellitus: Wessel et al. (2019) found that RBP4 levels were positively correlated with large very low-density lipoproteins (VLDL) versus small LDL, but no physical interaction was found between them. In patients with type 2 diabetes, RBP4 has a strong positive correlation with blood triglyceride (TG) levels (Vergès et al., 2012; Wessel et al., 2019; Table 1), The same correlation with blood triglycerides and HDL was found in RBP4 single nucleotide polymorphisms (Codoñer-Franch et al., 2016).