The obtained results mostly correspond with the ones described by Vinitha et al. [34], Mohiti et al. [35], Owecki et al. [36], and Taghdir et al. [37] who did not find a statistically significant dependence between the parameters in question in sick individuals with type 2 diabetes or with an impaired glucose tolerance, although a reverse correlation between the leptin concentration and the value of HbA1c in individuals with the mentioned diseases was also mentioned [38]. This evidence concerns the gene LEP and type 2 diabetes mellitus.