Fruits or anything with glucose or fructose bad for cancer?

Here's another issue with many different opinions that I'm grappling with. We all know that Sugar (especially White Sugar ) is bad for cancer. But what about fruits or anything that contains glucose or fructose? The idea I have read about is that cancer cells feed on glucose, therefore anything with glucose will feed cancer cells and should be avoided. Although there are some exceptions, such as the Brandt Grape Cure, in which the cancer patient goes into a fast of nothing but concord grapes. In this case, the grapes are meant to carry their many cancer-killing nutrients together with glucose to the cancer cells. The cancer cells are tricked into eating the glucose, and at the same time, the cancer-killing nutrients that they carry. It's like a Trojan Horse strategy. However, the author suggests that this should be done as a fast and it would not be good to eat grapes if you are not fasting with them.

What are your thoughts on eating fruits, honey, etc. not as a pure fast but taken with other foods as part of a cancer patient's regular diet?
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