AMA with Dom D’Agostino, Ph.D., Part II of II: Ketosis for cancer and chronic disease, hyperbaric oxygen therapy, and the effect of ketosis on female health

Being in a state of therapeutic ketosis suppresses insulin signaling (which drives PI 3-kinase), lowers glucose availability to the tumor, and elevates ketone bodies, which can't be readily utilized by most cancers as a source of fuel.

It's well-known that radiation therapy kills cancer cells by 80-90% just through reactive oxygen species generation ... You're generating reactive oxygen species, and those are toxic to tumor cells.