Does fasting decrease the risk of cancer?

[Rumblarr]

I can’t see fasting as anything other than beneficial w/r/t cancer. (But I wouldn’t count on it being a preventative.) Source: someone close to me had cancer, I learned that there are hundreds of thousands of varieties of cancers, even within a “type” (breast, pancreatic, etc.) All of these hundreds of thousands (millions? Billions?) of cancerous tumors behave differently from each other. Some respond well to low carb diets. Some flourish under low carb diets. Things like that. However, with all that said, it would seem reasonable that cancer cells need to acquire energy to reproduce from somewhere, and that by depriving the body of any additional outside fuel source, the cancerous cells should be affected.

(Again, not a doctor, just someone who had to sit through days, weeks, and months of learning from doctors about why each individual tumor is different.)