Effectiveness and Impact on the Quality of Life of Ketogenic Diet in Pediatric Patients

Inclusion Criteria: * Pediatric patients (aged \< 18 years) with drug-resistant epilepsy (fail to achieve (and maintain) seizure freedom with adequate trials of two or more antiseizure medications) or genetic, metabolic, neurological (congenital and acquired) diseases treated with ketogenic diet * Pediatric patients (aged \< 18 years) with metabolic, genetic or neurological (congenital and acquired) diseases (not necessarily associated with drug-resistant epilepsy) treated with ketogenic diet; this includes the new KD indications or the administration of KD in the ICU for status epilepticus. Exclusion Criteria: * Patients affected by beta-oxidation cycle disorders, systemic primary carnitine deficiency, primary dyslipidemia, pyruvate carboxylase deficiency, porphyria, mitochondrial disease, defects in ketone body metabolism (ketogenesis or ketolysis), defect in gluconeogenesis. * Children with type 1 diabetes * Parents (or caregivers) unable to guarantee adherence to the