GPT and obesity due to melanocortin 4 receptor deficiency: Additionally, levels of gamma-glutamyl transpeptidase (GGT), alanine transaminase (ALT), ferritin, and insulin resistance were higher in NAFLD patients who were not taking MHT, while women who were not taking MHT, regardless of their NAFLD status, had higher rates of overweight, obesity, and insulin resistance compared to those who used MHT.