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This is Dr. David
you are talking about the ketogenic diet
"The ketogenic diet which is a high-fat, low-carbohydrate diet that mimics the fasting state and stimulates the ketogenic metabolism pathway and was first used in the 1920s at Mayo Clinic. It has since been discovered to improve seizure control in children with intractable epilepsy. More than 100 Mayo Clinic pediatric epilepsy patients are currently on the diet"
here is more good information
let me know if you have questions.