Stupid question before even reading the article: doesn't exercise control blood sugar levels, which in turn reduces the surplus fuel supply of any cancer cell trying to grow?

Yes but if you suggest people with cancer reduce their glucose consumption the world thinks your crazy

I vaguely remember that it depends on the cancer type whether that works. The study showed it for melonomas and breast cancer so for those there's a good reason to decrease blood sugar or even doing a keto diet. I'd love to see further research on putting mice with melonomas on a keto diet.

Seyfried's metabolic framework for cancer would indicate all cancer can only metabolize glucose. Ongoing studies in human's right now with Seyfried's press-pulse protocol on glioblastomas (aggressive standard of care only has a 6 month lifespan, so we will see results fairly quickly).