Interestingly, the GG genotype of PER2 rs2304672, which had a significantly increased risk of obesity in our results (Table 4), showed lower expression levels than C carriers (CC genotype: not found in the eQTL violin plot analysis, but a small portion of subjects were present in our data; n = 8 males and n = 12 females). Here, PER2 is linked to obesity due to melanocortin 4 receptor deficiency.