Multi-day fasting can be used to kick off a ketogenic diet or intermittent fasting can support a keto diet.

And though there have been no human brain cancer trials to date, efficacy has been proven in a mouse model and a breast/ovarian cancer study.

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  • Active Clinical Trials
  • Studies

Intermittent fasting consists of limiting the hours of the day one eats and it appears to provide most/if not all of the benefits of a prolonged fast:

There is also the fasting mimicking diet which was created by Valter Longo, who could be considered the foremost expert on all things calorie restriction and health:

And here's a detailed write-up on Fasting and Cancer from the University of California, San Francisco:

None currently available

Title: Fasting enhances the response of glioma to chemo- and radiotherapy


Summary: Scientists studied the effects of calorie restriction on mouse brain (glial) cancer cells as well as mice with implanted tumors.

Key takeaways:

  • “These results indicate that fasting and fasting-mimicking interventions could enhance the efficacy of existing cancer treatments.”
  • Extended fasting increased sensitivity to chemotherapy and radiation
  • Mice that underwent fasting conditions lived longer than those that did not



Title: The effects of short-term fasting on quality of life and tolerance to chemotherapy in patients with breast and ovarian cancer: a randomized cross-over pilot study


Summary: This was a randomized study that put patients into either a fasting group or non-fasting group and compared the quality of life for patients undergoing chemotherapy across each group.

Key takeaways:

  • Short-term fasting is well tolerated
  • Quality of life appeared to improve
  • Fatigue as a result of the chemotherapy lessened in the fasting group



Title: Effects of short-term fasting on cancer treatment


Summary: This study from 2019 conducted a review of the current studies and trials involving fasting to date.

Key takeaways:

  • The initial summarized data is promising
  • Fasting protects healthy cells while sensitizing cancer cells to chemotherapy
  • Short-term fasting is safe
  • Medical use is early though the existing data warrants further trials

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