RBP4 and obesity due to melanocortin 4 receptor deficiency: Most of ceramides, dhCers, and SMs showed unfavorable correlations with obesity (rs = 0.06 to 0.15), triglycerides/HDL-cholesterol (rs = 0.06 to 0.28), CRP (rs = 0.06 to 0.17), IL-6 (rs = 0.07 to 0.13), adiponectin (rs = −0.06 to −0.14), and RBP4 (rs = 0.06 to 0.24).