The ketogenic diet is an established and evidence-based treatment for drug-resistant epilepsy in children, and increasingly in adults. It is a high-fat, low-carbohydrate, protein-restricted dietary regime that induces and sustains a state of ketosis, altering the brain's primary fuel source in a way that reduces seizure frequency and severity in a significant proportion of patients. For children who have failed multiple anticonvulsant medications, it can be transformative. It