LEP and metabolic dysfunction-associated steatotic liver disease: In a population-based study involving 1610 subjects with NAFLD from a total of 4571 subjects, the circulating levels of leptin for normal, mild, moderate and severe steatosis were 10.7 ± 0.3 ng/mL, 12.1 ± 0.7 ng/mL, 15.6 ± 0.8 ng/mL, 16 ± 1.0 ng/mL, respectively.