Whether the statement "Sugar feeds cancer" is true depends on what you think it means and what you think it implies. In the 1940s a researcher named Otto Heinrich Warburg observed that while there is a large variance in the biochemistry of different types of cancer, one thing that all cancerous tissues have in common is an extremely high rate of glycolysis (using glucose for energy), especially in hypoxic (low oxygen) environments. This is called the "Warburg Effect" and it is generally accepted and appears to be true.
Warburg went further, claiming that this metabolic difference was the cause of cancer. This is called the "Warburg Hypothesis" and it is not widely believed these days, although there are some researchers who support variations of it. As stated by Warburg
The Warburg Hypothesis said...
Cancer, above all other diseases, has countless secondary causes. But, even for cancer, there is only one prime cause. Summarized in a few words, the prime cause of cancer is the replacement of the respiration of oxygen in normal body cells by a fermentation of sugar.
But we don't need the largely-discounted Warburg Hypothesis
to answer our question, the Warburg Effect
suffices. So, does sugar feed cancer? Yes, in a strictly literal sense it does. Cancerous tissues burn through glucose at a rate 40 times greater than normal tissues, and can continue to do so in the absence of oxygen which other tissues mostly can't.
But does this mean that one can kill cancer cells by eliminating the glucose on which they appear to rely? The answer to this question is technically: "Yes, sorta" but practically: "No." There doesn't seem to be any diet that people will put up with long-term that get the job done. If you reduce the amount of glucose available the cancer cells will simply use up all there is and keep on growing while the rest of the body starves. But... There have been several studies that have shown that a Calorie Reduced Ketogenic Diet -- a diet containing no carbs whatsoever and limited to near-starvation caloric content -- does seem to delay progression of some tumors.
So does cutting out sugar cure
Does it prevent cancer. Mostly no.
Does it have potential as a treatment
for cancer? Maybe. We'll see.
Some Wikipedia links for those of you who want to brush up on the high school biology necessary to have an opinion:The Warburg EffectGlycolysisFatty Acid Metabolism
Good post, interesting. My fav part: "Does it have potential as a treatment
for cancer? Maybe. We'll see.".