Ketogenic Diet With Chemoradiation for Lung Cancer (KETOLUNG)

Standard treatment for lung cancer includes chemotherapy concurrent with radiation therapy (chemoradiation). This study is a phase I trial to determine the safety of dietary manipulation during chemoradiation for lung cancer. Specifically, pre-clinical data from mouse studies indicates a ketogenic diet increases tumor cell killing. Participants will: * Utilize a specialized ketogenic diet designed by bionutritional services of the clinical research unit. This diet begins 2 days before chemoradiation and continues through at least 5 weeks of chemoradiation. * Have blood drawn for research purposes weekly to determine measurements of oxidative stress * Have urine collected sporadically through the study to determine measurements of oxidative stress * Keep a diary of concomitant medications, side effects, and blood sugars * Have follow-up to monitor for outcomes and overall survival