Ketogenic Diet With Radiation and Chemotherapy for Newly Diagnosed Glioblastoma

This study aims to see if reducing blood sugar and increasing ketones (a metabolic product that comes from using fats for energy) can increase survival and enhance the the effects of standard radiation and chemotherapy treatments used to treat glioblastoma multiforme (GBM). These changes occur from use of a ketogenic diet. This research has 2 goals: 1. Show that patients can tolerate the diet and maintain low blood glucose and high blood ketone levels. 2. Show if this diet enhances the effectiveness of standard treatment by prolonging survival of patients with a GBM.