Dietary Intervention

This clinical trial studies whether continuous glucose monitoring (CGM) can be used to help patients with glioblastoma manage their blood sugar (glucose) levels and improve survival. Glioblastoma is the most common malignant primary brain tumor in adults, with an average survival time of approximately 15-18 months despite therapy. Studies have shown that having a higher-than-normal amount of glucose in the blood (hyperglycemia) during radiation therapy is associated with poorer survival outcomes in glioblastoma patients. Hyperglycemia in glioblastoma patients is often driven by steroids that are commonly used during treatment. CGM uses a device that places a sensor under the skin that monitors glucose levels at regular intervals, providing real-time, or near real-time, glucose information. This can help to identify when a patient has changes in their glucose levels so they may receive necessary interventions or medications sooner. CGM may be an effective way for glioblastoma patients to manage their glucose levels, which may improve survival.

The goal of this randomized clinical trial is to learn if a healthy eating pattern called the MIND eating plan can reduce cancer-related cognitive impairment (commonly called "chemobrain") and other symptoms commonly experienced by women with newly diagnosed stage II-III triple negative breast cancer as they go through chemotherapy. The symptoms that will be measured include changes in memory and mental function, fatigue, sleep quality, anxiety, and depression. Researchers will compare measures from women in the 12-week MIND eating plan virtual intervention to a general health coaching (GHC) virtual intervention to see if the MIND eating plan helps reduce symptoms. Women will be contacted for follow-up measures 6 months after the 12-week interventions. Women randomly assigned to the GHC at the beginning of the study will have the opportunity to complete the MIND intervention after the 6-month follow-up. All study sessions and measures are done remotely. Participants will: * Be randomized to MIND or GHC interventions * Complete all study measures remotely (by online questionnaires, virtual visits and mail ) * Attend 8 virtual sessions of about 15-60 minutes each over 12 weeks * Be sent some of the key foods in the MIND eating plan during the MIND intervention * Be contacted for follow-up measures 6 months after interventions