 Every session will last from 60 to 90 minutes and will be conducted by a nutritionist. The subjects will be asked to keep a 3 day log of what they eat at the start of the study and at and at each visit in order to estimate nutrient intake. Every patient will be provided with information about the entire program and the different group and individual sessions with the nutritionist. At each visit the participants will be weighed and asked for the results of the tests for ketones in the urine once a week. The nutritionist will follow compliance with the program and monitor for potential adverse events at each visit. 