This study will look at the effects, good and/or bad, of treating primary brain cancers with diet therapy using an energy restricted ketogenic diet (ERKD) that uses food. An energy restricted ketogenic diet is a diet designed to keep blood sugars in the low range of normal while at the same time increasing the blood concentration of metabolic break down products called ketones. This diet is currently used to treat children with uncontrollable seizures. This diet is well tolerated by the children with minimal side effects reported after using the diet for years. * The main purpose of this study is to find out whether or not the energy restricted ketogenic diet will help patients with primary brain cancer by either decreasing the size of the cancer or by keeping the cancer from growing. * Another reason for doing this study is to learn about the side effects associated with the energy restricted ketogenic diet in patients with primary brain cancer.
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MRI imaging will be used to measure changes in brain tumor size.
Timeframe: 6 weeks after completion of radiation therapy