Diet and cancer: What we know and what we don’t – the evidence

This guide is based on scientific evidence, following our policy for evidence-based guides.

It’s written by Dr. Colin Champ, MD, with the latest major update on January 20, 2021. The guide was medically reviewed by Dr. Michael Tamber, MD, on January 20, 2021.

The guide contains scientific references. You can find these in the notes throughout the text, and click the links to read the peer-reviewed scientific papers. When appropriate we include a grading of the strength of the evidence, with a link to our policy on this. Our evidence-based guides are updated at least once per year to reflect and reference the latest science on the topic.

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Read more about our policies and work with evidence-based guides, nutritional controversies, our editorial team and our medical review board.

Disclaimer: Using ketogenic diets to aid in cancer therapy is a controversial topic without robust human trial data. Many of the recommendations are based on animal studies. This guide is not meant to suggest that keto diets are proven to help in cancer therapy. However, we present the data and ongoing research in the area to highlight the potential therapeutic role.

Discuss all changes in your diet with your physician, and if they are resistant to you starting a keto diet, please share this post with them and engage in a collaborative discussion. Full disclaimer

Should you find any inaccuracy in this guide, please email

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