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BACKGROUND the ketogenic diet (CD) is an established, effective non-pharmacological treatment for refractory epilepsy in childhood. AIM the objective of this study was to compare the efficacy, the presence of undesirable effects, and adherence between the classic ketogenic diet (DCC) and the modified Atkins diet (DAM). MATERIALS AND METHODS a retrospective and comparative investigation was carried out to evaluate the medical records of all the patients who started treatment with a ketogenic diet by the same team between 2008 and 2018. In all, 57 patients were started on a DAM diet and 19 patients were given a DCC diet. RESULTS it was observed that both the Atkins and the classic diets were equally effective (approximately, 80 %; p = 0.252). Regarding adherence, there was a significantly higher percentage of adherence to the Atkins diet than to the classic diet (p = 0.018). Fewer adverse effects were observed with DAM than with DCC (p = 0.012). In all, 21 % of patients under DAM had unfavorable effects (12/57), while 52.63 % of patients on DCC had complications (10/19). CONCLUSION a comparable effectiveness in terms of crisis control was found between DAM and DCC. However, DAM exhibits a much better adherence than DCC, and its undesirable effects are milder, less common. That is why, according to other works, it is likely that DAM should be first-choice for patients with refractory epilepsy in a large percentage of cases.