We also evaluated the K18 fragment levels in three additional groups of morbidly obese patients without any signs of NAFLD (n = 5), severe steatosis (n = 7), or severe steatosis associated with NASH (n = 7): assessed from a liver biopsy at baseline and at 1 year after LRYGB. The gene discussed is KRT18; the disease is metabolic dysfunction-associated steatotic liver disease.