AIMS

There are limited clinical data on the association between serum testosterone concentrations and nonalcoholic fatty liver disease (NAFLD) in men. The main aim of this study was to evaluate the association between testosterone concentrations and NAFLD in adult men, in terms of noninvasive indices of NAFLD and hepatic fibrosis.

METHODS

In this cross-sectional study, 98 men were recruited on an outpatient basis and were divided into low-testosterone (<12 nmol/l or <346 ng/dl, n = 37) or high-testosterone groups (≥12 nmol/l or ≥346 ng/dl, n = 61). Serum testosterone concentrations were measured by immuno-chemiluminescence. Hepatic steatosis index (HSI) and Triglyceride-to-HDL-C ratio (THR), as non-invasive indices of NAFLD, as well as AST-to-Platelet Ratio Index (APRI), fibrosis-4 index (FIB-4) and NAFLD fibrosis score (NFS), as non-invasive indices of hepatic fibrosis, were calculated based on standard formulas.

RESULTS

Both the non-invasive indices of NAFLD (HSI and THR) were higher in low-testosterone compared with high-testosterone group (HSI: 47.5 ± 2.9 vs. 38.4 ± 1.0, p = 0.005; THR: 1.70 ± 0.16 vs. 0.98 ± 0.07, p < 0.001). On the contrary, none of the non-invasive indices of hepatic fibrosis was different between groups. HSI (p = 0.038), but not THR, remained inversely independently associated with serum testosterone, after adjustment for potential confounders, including sex hormone-binding globulin.

CONCLUSIONS

Men with low testosterone concentrations have higher non-invasive indices of NAFLD (HSI and THR), but not of hepatic fibrosis (APRI, FIB-4, NFS), compared with counterparts of high testosterone concentrations. HSI was inversely and independently associated with testosterone concentrations.