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Diagnosis and management of nonalcoholic fatty liver disease (NAFLD) remain a clinical challenge, in particular, how to accurately differentiate nonalcoholic steatohepatitis (NASH) from hepatosteatosis.In this study, by exploiting collective fluctuations of the lipidomic data, we discovered a critical stage (termed pre-NASH) from steatosis to NASH in a mouse model of NAFLD based on dynamical network biomarker (DNB) theory.