At the biological level, the dysregulation of leptin, endocannabinoids, dopamine, brain-derived neurotrophic factor, and inflammatory cytokines, molecules involved in both appetite regulation and some aspects of the pathophysiology of endometriosis, suggests overlapping neuroimmune pathways that may link endometriosis to DEBs and EDs. The gene discussed is BDNF; the disease is Ehlers-Danlos syndrome.