A study of 23 obese adolescents showed that low FGF19 was associated with insulin resistance, and inversely correlated with alanine aminotransferase (ALT) and triglycerides.[11] Low FGF19 was associated with NALFD (median FGF19 was 81 vs. 201pg/mL in controls), and was even lower in those with progression to NASH (54pg/mL). Here, GPT is linked to Insulin resistance.