We aimed to illustrate the epidemiology of nonalcoholic fatty liver disease in high-risk groups, which were identified based on existing literature. To this end, PubMed was searched to retrieve original articles published through May 2015 using relevant and pertinent keywords "nonalcoholic fatty liver disease" and "diabetes", "obesity", "hyperlipidemia", "familial heterozygous hypobelipoproteinemia", "hypertension", "metabolic syndrome", "ethnicity", "family history" or "genetic polymorphisms".We found that age, sex and ethnicity are major physiologic modifiers of the risk of nonalcoholic fatty liver disease, along with belonging to "nonalcoholic fatty liver disease families" and carrying risk alleles for selected genetic polymorphisms. Metabolic syndrome, diabetes, obesity, mixed hyperlipidaemia and hypocholesterolemia due to familial hypobetalipoproteinaemia are the major metabolic modifiers of nonalcoholic fatty liver disease risk. Compared to these metabolic conditions, however, arterial hypertension appears to carry a relatively more modest risk of nonalcoholic fatty liver disease.A better understanding of the epidemiology of nonalcoholic fatty liver disease may result in a more liberal policy of case finding among high-risk groups.