 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 benefit from the ketogenic diet than from trying another anticonvulsant drug . There is some evidence that adolescents and adults may also benefit from the diet . 
