INS and hereditary elliptocytosis: In addition, Serum insulin, TG, free fatty acid (FFA) and total cholesterol (TC) levels observed in the OE were significantly different compared to those of the OS (p < 0.01); additionally serum TG and FFA levels measured in the OE were found to be significantly higher than those of the HE (p < 0.05, p < 0.01).