Keto Diet for Brain Tumors: Safe So Far, But No Proof It Helps
Original title: Ketogenic Diet in the Treatment of Malignant Gliomas: A Systematic Review.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This looks across many earlier studies rather than running a new one.
This is a summary of past studies in people, and it says the diet is not proven to help.
The short version
A review of past studies found the keto diet is doable for many people with a glioma: A tumor that starts in the glial cells, the support cells of the brain and spinal cord. Gliomas are graded 1 to 4 by how fast they tend to grow. See the glossary, but there is no proof yet that it helps them live longer or feel better.
What was studied. Researchers gathered every human study they could find on the ketogenic diet in people with glioma: A tumor that starts in the glial cells, the support cells of the brain and spinal cord. Gliomas are graded 1 to 4 by how fast they tend to grow. See the glossary, a type of brain tumor. They looked at how long people lived, quality of life, blood test changes, weight, and side effects.
What they found. Twenty-three studies with 306 patients were included. Only two were the strongest kind of study, and those found no clear difference in survival for people on the diet. Overall, 20.3% of people stopped the diet, often because it was too strict or hard to live with. Most people did reach ketosis, weight changes were small, and side effects were mostly mild.
What this means, and what it doesn't
What it could mean: If you and your team are thinking about a keto diet, this review suggests it can usually be done safely alongside regular care. It is strict, and one in five people in these studies quit. But there is no good evidence yet that it slows the tumor or helps you live longer.
What it doesn't mean: This does not mean the keto diet treats or cures a brain tumor. This is not a new study. It is a summary of older studies, most of them small and not well set up to answer the question. The authors say any benefit to survival or quality of life is still unproven. Nothing here says you should change or replace your standard treatment. Talk to your own care team before changing how you eat.
Source: PubMed, July 3, 2026 · Read the original
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