How Rebecca Devine Used Diet and Immunotherapy to Beat GBM

Many of you know the name Rebecca Devine—a true inspiration in the metabolic cancer space. Diagnosed with glioblastoma in 2018, Rebecca is now thriving 7 years later. One of the key pillars in her healing journey? Diet—but not a one-size-fits-all approach.

Here’s how her diet evolved through the years:

Early phase: Strict Ketogenic + Intermittent Fasting

She started with a very clean ketogenic diet, aiming to starve cancer cells of glucose. Combined with fasting, this was the foundation of her early strategy—aligned with Seyfried’s metabolic approach.

Next phase: Plant-based Mediterranean focus

After stabilizing her cancer and improving her health, she transitioned to a plant-forward Mediterranean style—lots of vegetables, legumes, olive oil, healthy fats, and whole foods. The goal here: lower inflammation and support immune function.

Now: Hybrid approach with eggs and fermented dairy

More recently, Rebecca has added organic eggs and fermented dairy back into her diet—supporting muscle strength, gut microbiome health, and a sustainable lifestyle.

Her core philosophy? Flexibility. She adjusts her diet to what her body needs at each stage, always aiming to reduce inflammation, support immunity, and nourish her body with the best fuel possible.

If you want to dive deeper, I highly recommend checking out her Instagram or her Brainy Blonde Podcast, where she shares practical tips and what she’s learned through her journey.

Any thoughts?

It’s interesting to me that Rebecca transitioned from a Keto diet to plant-based Mediterranean diet after stabilising her cancer. Dr. William Li mentioned about her story in his recent podcast on the Diary of a CEO.

She also took part in a novel peptide vaccine program alongside Dr. Saskia Biskup in Tübingen, Germany. This tailored immunotherapy is designed to train her immune system to specifically recognize and attack her tumor cells. It’s a cutting-edge trial using tumor-specific antigens, and Rebecca credits it, in part, for keeping her in remission

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