Finally, it has been reported that a common single nucleotide polymorphism [63, 64] (up to 30% methionine carriers in European [64]), that results in a valine to methionine substitution (in the region of exon IX of the BDNF gene) is related to lower BDNF levels [65], which again has been associated with BMI [66] and eating disorders [67]. Here, BDNF is linked to eating disorder.