O Dem Bones
Cologuard™ Cancer Screening Test. Should You or Shouldn't You?

A recent question from reader Dana Phillips, who asks, I’ve read that sugar fuel cancer. Have there been studies to see if consuming sugar, to promote cell division, during chemo therapy would enhance its effectiveness?" My answer: Great question, Dana. "Sugar makes cancer cells grow" is an urban legend, and I don't know where it got started. ALL cells in the body need sugar to grow, and the brain absolutely needs it to function. The fact is that cancer cells often (not always) grow faster, or with less control, than normal cells, regardless of how much sugar is available to them.
Sometimes chemotherapy takes advantage of differing metabolism between cancerous and normal cells to kill cancer cells. Anti-metabolite chemo drugs like methotrexate can kill some cancer cells by preventing them from getting nutrients; in this case it's folate, a B vitamin. There are some chemo drugs that only kill growing cells, and those are not combined with drugs that stop cancer cells from growing, for obvious reasons. But stimulating cancer cell growth will also stimulate normal cell growth, and the chemo will kill more normal cells, too, thereby increasing the toxicity. Strategies like this have been investigated for decades, with little success.
In short, if you're on chemotherapy and want to improve your chances by eating a lot of sugar, you are unlikely to make a difference one way or another. And if it makes you feel that you are doing something good for yourself, then go ahead by all means.