In our study, we aimed to investigate whether the clinical features, serum fasting asprosin and PYY levels and metabolic parameters of the BD-M group, euthymic group and control group differed, and to evaluate the relationship of asprosin and PYY levels with clinical features, metabolic parameters, severity of symptomatology and psychopathology in BD-I. The gene discussed is PYY; the disease is Behcet disease.