As shown in Figure 3, in the multivariate logistic regression model, the muscle mass of the lower limbs, upper limbs, extremities, trunk, and their respective quintiles were negatively correlated with NAFLD; the muscle mass of the lower limbs had the greatest significance, and these associations remained consistent after adjustment for age and sex (Model 1), further adjustment for smoking, exercise, hypertension, diabetes, and WC (Model 2), and further adjustment for TG, TC, LDL, HDL, ALT, and IR (Model 3). This evidence concerns the gene GPT and diabetes mellitus.