In our previous study, we demonstrated that, besides obesity, fasting also represses CYP2R1 in the liver, which involved potentially both the GR and PGC‐1α‐ERRα pathways.(16) Furthermore, the PGC‐1α‐ERRα pathway induced CYP24A1 in the kidney in response to fasting. The gene discussed is PPARGC1A; the disease is Obesity.