Recent research has suggested that ghrelin could promote and protect the dopaminergic nigrostriatal pathway [38] in which case the negative correlation finding would be surprising and rather reflect the global increase in the caudate related to the D2 antagonist effects on the nigrostriatal pathway while olanzapine-induced movement disorders are doserelated [39] and the average dosages were above 15 mg per day in our cohort. The gene discussed is GHRL; the disease is movement disorder.