BDNF and X-linked cone dysfunction syndrome with myopia: The main results show that only a small number of polymorphisms have been analyzed for each gene until now, with a direct relationship with BED (ABCA1 rs9282541; BDNF rs6265; DRD2 rs1800497; DRD3 Ser9Gly; DRD4 rs936461; FTO rs9939609; and Taq1A rs1800497), although there has been a larger number of articles related to episodes of compulsive eating manifested in other EDs, such as AN or BN (COMT Val 108/158; HTR2A rs1923882, rs6561333, and rs2296972; FTO rs1421085, rs1121980, and rs1558902; MCR4 rs17782313; and OXTR rs2254298 and rs53576).