RARRES2 and obesity due to melanocortin 4 receptor deficiency: The correlation between BMI and chemerin levels is well researched [4,19,21,22,29,30,33,34,35]; however, the relationship between T2D and chemerin levels has not been well documented in either individuals with a normal weight and T2D (NWD) or individuals with obesity and T2D (OWD) [32,36].