The ketogenic diet can lower the amount of seizures. Most 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. Adolescents and adults may also benefit from the diet, though this diet is hard to follow. Questions still remain on why this diet works.