TNF and metabolic syndrome: In our study, a positive correlation was observed between IL-13 and TNF-α levels (R = 0.34, p = 0.007) and between IL-13 and pro inflammatory cytokine IL-8 (rs = 0.33, p = 0.003) which may be associated with the role this cytokine plays in the development of low-grade systemic inflammation in individuals with the metabolic syndrome.