This study consists of a open label randomized controlled clinical trial comprised of 20 patients with diagnosis of functional neurological symptom disorder with non epileptic seizures distributed in 2 arms of 10 patients each.~Patients will be randomly assigned to one of the groups. Both groups will be receiving treatment as usual (SSRI and/or psychotherapy). One group will be assigned a ketogenic diet while the other will be assigned a healthy diet, both supervised by a team of nutritionists. Patients will be evaluated every 2 weeks until reaching 6 weeks.
The objective of this study is to determine the effects of the ketogenic diet on the frequency of non-epileptic seizures in patients with functional neurological symptoms disorder compared to a healthy diet.