Efficacy
The ketogenic diet reduces seizure frequency by more than 50% in half of the patients who try it and by more than 90% in a third of patients. Three-quarters of children who respond do so within two weeks, though experts recommend a trial of at least three months before assuming it has been ineffective. Children with refractory epilepsy are more likely to find the ketogenic diet to be effective than to benefit from trying another anticonvulsant drug. There is some evidence that adolescents and adults may also benefit from the diet.
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