It certainly is not as simple as "just go without food", however there is some promising research showing reducing glutamine intake can reverse cancer cells acq

It certainly is not as simple as "just go without food", however there is some promising research showing reducing glutamine intake can reverse cancer cells acquired resistance to cisplatin (which is a huge problem when chemo works until it doesnt)- the research is early and its counterintuitive but it does not mean that this line of enquiry is not valid. http://emboj.embopress.org/content/37/14/e98597 http://emboj.embopress.org/content/37/14/e98597 There was also some recent research showing promise of cannabinoids in augmenting the effects of chemotherapy https://www.sciencedaily.com/releases/2018/07/180730160618.htm https://www.sciencedaily.com/releases/2018/07/180730160618.h... Also it's worth noting there is some research indicating that chemotherapy may have more complex mechanisms of action than initially thought - specifically as partially acting on the immune system https://www.researchgate.net/publication/240309349_Immune-based_mechanisms_of_cytotoxic_chemotherapy_Implications_for_the_design_of_novel_and_rationale-based_combined_treatments_against_cancer https://www.researchgate.net/publication/240309349_Immune-ba... There are nuances to all aspects to selecting a treatment strategy for individuals with cancer. With adequate clinical studies we may indeed see a future where, for some but not all patients, both fasting and cannabinoids could be key parts of a personalised treatment strategy. Compared to the risk profile of "breakthrough" therapies (think side effects, unknown-unknowns, costs) these are two potential adjuncts to chemotherapy with relatively minor risks if applied under correct medical supervision.