Starve Cancer To Death

This NY Times article discussing the Warburg effect is of interest.

The default approach of modern medicine will always be to find a pharmacological agent to target cancer metabolism. Nothing wrong with that per se, but diet is important as well. If doctors and oncology centers are going to offer their cancer patients glazed donuts and milk chocolates as snack food, they are defeating the purpose of treatments that aim at glucose-addicted tumors. 

Similarly, a diet high in refined carbohydrates, sugar, etc. is not "optimal" for cancer prevention.