IL4 and obesity due to melanocortin 4 receptor deficiency: Our results show that individuals with obesity (n = 15) had a significant reduction in AT-EOS content (P < 0.01), decreased AT–IL-4 gene expression (P = 0.02), and decreased IL-4 plasma levels (P < 0.05) in addition to expected IR (P < 0.001) and hyperleptinemia (P < 0.01) compared with lean subjects (n = 15).