It is well accepted that nutrition as an environmental factor is involved in the pathogenesis of multiple sclerosis. But is there a role for prolonged fasting and ketogenic low glycemic load treatment to alter the course of multiple sclerosis (MS)? The investigators think yes there is. Primarily the investigators want to detect if these diets are feasible for MS patients. Therefore the investigators examine the impact of this dietary intervention on the health related quality of life for individuals after 7 days, 3 months and 6 months in compare to baseline. Secondarily the investigators focus on endocrinological and immunological changes after 7 days, 3 months and 6 months in compare to baseline.