REG3A and obesity due to melanocortin 4 receptor deficiency: REG3α concentrations were numerically highest in individuals with overweight, intermediate in those with obesity, and lowest in controls (mean 646.03 ± 217.09 ng/mL, 574.78 ± 212.07 ng/mL, and 521.49 ± 311.27 ng/mL, respectively), although the overall difference between groups did not reach statistical significance (p = 0.226).