Intractable epilepsy are basically seizures which cannot be controlled with AED one year after onset, even with accurate diagnosis and monitoring of treatment.Intractable epilepsy is linked with an elevated risk of mortality, unemployment and impairment of cognition. Diet therapy measures are in use for the treatment of refractory epilepsy since prehistoric periods. Over the last decade, alternative treatment options, such as diet therapy has gained popularity. Ketogenic diet (KD) is an effective, non-pharmacological treatment for drug resistant epilepsy and difficult to treat epilepsy syndromes of infancy and early epileptic encephalopathies. The diet is deficient in vitamins and minerals and a number of complications have evolved in the form of case reports which mostly reveals oral and systemic complications attributing to a certain deficiency state.