I've seen many reports that autophagy induced by a water fasting can actually cure cancer.
Here is a report on leukemia:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5300768/It can also actually cure arthritis and diabetes and numerous other diseases.
Dr Jason Fung is a liver specialist who got fed up with following the main stream protocol while watching his patients get worse for years and then die.
He has done the deep dive on fasting of all kinds---intermittent, short term and long term (month long) fasts and it's curative results proven by real science.
You can find lots more at his website, his youtube videos, as well as searching for information using key words:
autophagy
cancer and fasting