[devmor]

>There's no reason to assume that your body's tolerance to starvation is the same as, or poorer than, the cancer's tolerance to starvation

It's not an assumption, it is knowledge based on a general understanding of how cancer functions.

Even without that knowledge, you should be able to observe that people dying of cancer eat less than is needed to sustain their bodies, and such behavior does not slow down the progression of cancer.