Objective: obesity and depression are likely to interact mutually which makes it unclear if obesity causes depression or it leads to obesity; and how the genotypes have a role in obesity and depression.

Methods and Materials: This cross sectional study was conducted on a sample of 400 individuals from the participants in the third phase of the comprehensive Iranian Multicenter Osteoporosis Study (IMOS). Anthropometric measurements and depression were assessed. To investigate the NPY polymorphism, PCR-RFLP was used. Binary logistic regression model was employed to determine depression as the dependent factor and gene polymorphism

Results: the frequency of NPY rs16139 was 6%. No significant association could be found between NPY genotypes and depression (p >0.05). Furthermore, the results suggest that those with central obesity seem an increased chance of developing depression (P=0.02).