RBP4 and metabolic dysfunction-associated steatotic liver disease: Some researches indicated that RBP4 is elevated in non-diabetic NAFLD patients [9], or diabetic NAFLD [19] or morbidly obese women, specifically, in morbidly obese subjects with NAFLD [20], and selected studies claimed that there exists a positive association between RBP4 and liver enzymes, specifically ALT and GGT [9].Circulating RBP-4 correlated positively with liver fat which may reflect its effects on hepatic insulin sensitivity [21].