Cut-Off Values of Visceral Adiposity to Predict NAFLD in Brazilian Obese Adolescents

Ana Paula Grotti Clemente, Bárbara Dal Molin Netto, Aline di Piano Ganen, Lian Tock, Danielle Arisa Caranti, Marco Túlio de Mello, Sergio Tufik, Ana R Dâmaso, Ana Paula Grotti Clemente, Bárbara Dal Molin Netto, Aline di Piano Ganen, Lian Tock, Danielle Arisa Caranti, Marco Túlio de Mello, Sergio Tufik, Ana R Dâmaso

Abstract

Objectives. The present study aimed at determining cut-off points of visceral fat to predict NAFLD and analyzed metabolic disorders of obese adolescents. Methods. Cross-sectional study involved 165 obese adolescents ranged in age from 15 to 19 years. Glycemia, hepatic transaminases, lipid profile, and insulin resistance were analyzed. Visceral and subcutaneous fat were measured by ultrasound and body composition by plesthysmography. Results. The NAFLD adolescents had significantly higher values for body mass, BMI-for-age, BMI, total fat, waist circumference, and visceral fat when compared with non-NAFLD obese adolescents in both genders. Moreover, there were significant positive correlations between visceral fat with the variables BMI-for-age (r = 0.325,), TG (r = 0.277), AST (r = 0.509), ALT (r = 0.519), WC (r = 0.390), and visceral/subcutaneous ratio (r = 0.790) for NAFLD group. Total fat, triglycerides, and visceral fat were the independent predictors to NAFLD. Analysis of the ROC curves revealed cut-off points of visceral fat of 4.47 cm for girls and 4.21 cm for boys. Conclusions. The results may suggest that abdominal ultrasonography procedure may be a safe alternative method of assessing visceral adiposity aiming to be considered to the development of preventive and treatment strategies in obese individuals. This clinial trial is registered with ClinicalTrial.gov (NCT01358773).

Figures

Figure 1
Figure 1
Receiver-operating characteristic (ROC) curve for the identification of NAFLD based on the visceral fat (cm) of adolescents. The area under the ROC curve of the boys was 0.784 (95% confidence interval 0.658–0.910). The WC cut-off point for the boys was 4.20 cm. And the area under the ROC curve of the girls was 0.615 (95% confidence interval 0.509–0.721). The WC cut-off point for the girls was 4.47 cm.

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