GCG and obesity due to melanocortin 4 receptor deficiency: Among all patients with obesity, the GLP‐1/chromogranin A ratio correlated with meal test blood glucose at 60 min (r = 0.438, p = 0.047), glucose AUC (0.379, p = 0.047), glucose incremental AUC (0.398, p = 0.047), and HbA1C (r = 0.426, p = 0.019; Spearman), but among subgroups of the patients, no significant associations were seen.