Hypothesi(e)s: The long term tolerability of the KD (Ketogenic Diet) has been established (Groesbeck et al., 2006). Recent studies involving human patients with brain cancer showed tolerability of the Ketogenic diet over a period as long as 19 months with minimal side effects. However the MAD (Modified Atkins Diet) long term side effects are as of yet unclear. Given the similarity of the MAD compared to the KD, and being less restrictive, the long term side effects (kidney stones, dyslipidemia, gastroesophageal reflux) of the MAD is projected to be similar, if not reduced, in comparison to the KD. Modified carbohydrate diets as well as ketogenic diets have been tolerated by people with epilepsy. It is hypothesized that the effect this diet will have on overall weight loss, hyperlipidemia, and blood glucose levels will be minimal and tolerable even by cancer patients over a prolonged period of time, up to 12 months or possibly longer. Given the tolerability of the diet in brain cancer patients, it is hypothesized that patients with other types of tumors will find this diet tolerable and safe.