A systematic review of animal models of NAFLD finds high fat, high fructose diets most closely resemble human NAFLD.

Animal models of human disease are a key component of translational hepatology research, and yet, there is no consensus on which model is optimal for non-alcoholic fatty liver disease (NAFLD). Here, we generated a database of 3,920 rodent models of NAFLD. Study designs were highly heterogeneous and, therefore, few models had been cited more than once. Analysis of genetic models supported the current evidence for the role of adipose dysfunction and suggested a role for innate immunity in the progression of NAFLD. We identified that high fat, high fructose diets most closely recapitulate the human phenotype of NAFLD. There was substantial variability in the nomenclature of animal models: a consensus on terminology of specialist diets is needed. More broadly, this analysis demonstrates the variability in preclinical study design, which has wider implications for the reproducibility of in vivo experiments both in the fields of hepatology and beyond. In conclusion, this systematic analysis provides a framework for phenotypic assessment of NAFLD models and highlights the need for increased standardization and replication.