+I think that this article reflects the current "state of the art" very well.
You Can’t ‘Starve’ Cancer, but You Might Help Treat It With Food (2019,TheAtlantic)There is no single “cancer diet.”
In other words, a low-sugar diet could help combat some cancers, but it’s certainly not as simple as Cancers eat sugar, so low sugar stops cancer.
“It’s not ‘starving’ the cancer, but rather finding precise vulnerabilities that make metabolic therapies feasible.”
But focusing on specific patterns of eating will likely be part of many cancer-treatment guidelines in coming years.