Regarding sugar restrictions, the body, particularly the brain, requires glucose (sugar) for normal functioning. Thus having sufficient glucose in the blood is essential to health. Cancer cells will sequester sugar (take up what's available) no matter what dietary changes you make. Therefore sugar restriction is not a plausible way to restrict the growth of cancer cells. Basically this good-sounding idea is junk science. That's not to say we should eat donuts and cake with abandon, but an occasional dessert will not make a difference one way or the other.
We have enough to worry about without denying ourselves simple pleasures from time to time.
For more answers to questions like this, carefully consider where you get your information. Personal testimonies and ads are one thing, journal articles and replicated studies are another.
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