After much reading, research, and listening to our treatment team, I 've learned that Glioblastoma symptoms and survival time is unpredictable. Depends on health and age, location of tumor, DNA analysis, response to treatment....and more. My husband was diagnosed in April 2024, had surgery and the standard radiation and a year of chemo. He also was using an Optune device for a year (not for everyone, but worth a look). He has not been on a keto diet, although we have focused on a healthy vegetarian diet (has been vegetarian for over 40 years) with plenty of protein to keep muscle strength. His tumor re-occurred in July 2025. Still some treatment options. Be realistic but keep up your spirits. Wishing you the best.