BDNF and obesity due to melanocortin 4 receptor deficiency: The BDNF rs4923461 A-allele associated with increased risk of overweight, with a per allele OR of 1.15 (1.07–1.24, p = 2.5×10−4), and borderline with obesity with a per allele OR of 1.14 (1.05–1.23, p = 0.002) but not with morbid obesity (Table 1, Table S4).