Healthy cells CAN turtle-up, whereas cancer cells engage in unregulated reproduction. Also, some cancer cells can only consume glucose. Which, in a fasted state, would mean that the majority of energy would be in ketones(if the individual were metabolically healthy), starving the cancer cells to death.
Why wouldn’t a strict keto diet not be a cure for those cancers?
many people try it, but the results are mixed.
Because the cancers cells adapt! (fast reproduction and high mutation rate of the cancerous cells make that process quicker than antibiotics resistance)