As mentioned elsewhere in the thread, chemo may work due to a forced state of ketosis. The "would eat itself" hypothesis, although it sounds cheesy has a bit of

As mentioned elsewhere in the thread, chemo may work due to a forced state of ketosis. The "would eat itself" hypothesis, although it sounds cheesy has a bit of truth grounded in many recent studies. But stopping eating sugars is not enough, at all. He would have had stopped eating any carbs (<5% of calories from carbs) and not too much protein (<10-15% of calories in protein), because both are converted to sugar quite easily. That means eating more fat instead so the body uses ketones instead of sugar. And much more salt, sodium and magnesium to avoid the infamous "keto flu".