For the UCP2 Ala55Val polymorphism, the C allele was found to be not associated with obesity risk using either additive (REM OR = 0.91, 95% CI: 0.76–1.08), dominant (FEM OR = 0.83, 95% CI: 0.69–1.10), recessive (REM OR = 0.89, 95% CI: 0.69–1.13) or co-dominant (FEM OR = 0.81, 95% CI: 0.64–1.02) model (Table 4 and Fig. 2). Here, UCP2 is linked to obesity due to melanocortin 4 receptor deficiency.