In this controlled randomised pilot study the patients are allocated to 1. a ketogenic low glycemic load treatment from the outset of the study for 24 weeks or 2. enhance their regular diet with an initial 7-day fasting followed by a Mediterranean diet pattern until the study end or 3. stay on their regular diet (control group) from the outset of the study for 24 weeks. The investigators will then assess the differences between the groups.