RecruitingDietary supplementKetogenic Therapy Effects on Electrical and Metabolic Abnormalities in EpilepsyApproximately a fourth of children with seizures do not respond adequately to available therapy. Ketogenic therapy has a long history as treatment for intractable epilepsy, but there is no agreement concerning how it works and what is the best way to administer it. This natural history study will collect data pertaining to both questions.