Long-term Treatment With the Ketogenic Diet in Epilepsy

Inclusion Criteria: * Treatment with the ketogenic diet at the National Centre for Epilepsy (SSE) for 5 years or more * Able to travel from The National Centre for Epilepsy - SSE (Sandvika) to Rikshospitalet (Gaustad) to perform procedures to investigate cardiovascular risk factors * Willing to draw extra blood for research purposes * Willing to sign informed consent and participate in the study in accordance with the study protocol * Willing to sign informed consent for blood samples to be included in research biobank at the Department of Neurology, Oslo University Hospital Exclusion Criteria: * Non-compliance with the dietary treatment for 6 months or longer or more than once per month * Not possible to communicate with parents in Norwegian or English without interpreter * Patient not able to cooperate and lie still for about ten minutes during the carotid ultrasound examination * Psychiatric/mental illness, alcohol or drug abuse or other factors making it impossible to pursue the study protocol