An Interactive Time-Restricted Diet Intervention (txt4fasting) for Reducing Neurocognitive Decline and Improving Survival in Patients With Brain Metastases From Breast or Lung Cancer

PRIMARY OBJECTIVE: I. To examine the feasibility and acceptability of the txt4fasting intervention. SECONDARY OBJECTIVES: I. To compare neurocognitive function decline between the intervention and the control arms. II. To compare progression free survival (PFS) between the intervention and the control arms. TERTIARY (EXPLORATORY) OBJECTIVE: I. To evaluate the change in biomarkers, from baseline to the end of the study, between the intervention and the control arms. OUTLINE: Patients are randomized to 1 of 2 arms. ARM I: Patients follow a time-restricted diet, receive interactive positive reinforcement messages, and record food intake using the txt4fasting platform daily for 30 days. Patients receive counseling calls twice weekly in weeks 1 and 2 then once weekly in weeks 3 and 4. Patients then undergo stereostactic radiosurgery (SRS) on study. Patients also undergo blood sample collection and brain magnetic resonance imaging (MRI) throughout study. ARM II: Patients receive text messages about healthy eating habits and food suggestions twice daily and record food intake using txt4fasting program for 30 days. Patients then undergo SRS on study. Patients also undergo blood sample collection and brain MRI throughout study. After completion of study intervention, patients are followed up immediately at the end of the intervention, and at 3 and 6 months.