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Abstract

Non-alcoholic fatty liver (NAFL) is an independent risk factor for the development of type 2 diabetes (T2DM). We examined metabolic perturbations in patients with NAFL, patients with T2DM, and control (CON) subjects with normal intrahepatic lipid (IHL) content.A two-step (10 mU/m2 /min; 40 mU/m2/min) hyperinsulinemic-euglycemic clamp was performed in 11 NAFL, 13 T2DM, and 11 CON subjects, all matched for BMI, and aerobic fitness. IHL content was measured using proton magnetic resonance spectroscopy. Because of high IHL content variability in T2DM patients, this group was separated into a high IHL content group (IHL ≥ 5.0%, T2DM+NAFL) and a normal IHL content group (IHL Pi) was higher in NAFL (PP=0.055 versus CON subjects, PP=0.046) was lower in NAFL compared with CON subjects, with intermediate values for T2DM-non-NAFL, and T2DM+NAFL subjects. Suppression of endogenous glucose production (EGP) and insulin-stimulated glucose disposal (ΔR_d) was comparable between NAFL, T2DM-non-NAFL, and T2DM+NAFL subjects (all P>0.05), and was lower in comparison with CON subjects (all PP=0.047) and NAFL subjects (P=0.059) compared with CON subjects. Adipo-IR_i (r=0.652, Pi) (r=0.576, P=0.001), and ΔR_d (r=-0.653, P<0.001) correlated with IHL content.Individuals with NAFL suffer from metabolic perturbations to a similar degree as T2DM patients. NAFL is an important feature leading to severe insulin resistance and should be viewed as a serious health threat for the development of T2DM. ClinicalTrials.gov: NCT01317576.

Metabolic disturbances of non-alcoholic fatty liver resemble the alterations typical for type 2 diabetes

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