The notion is absurd. Sugar from corn has not been shown to be different from other sugar in terms of sweetness, eliciting insulin release or the feeling of satiety after eating. All are metabolized in the same fashion and provide four calories per gram.
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Dr. Bruno notes that CFS patients tend toward hypoglycemia (low blood sugar) and that sugar is necessary for proper brain functioning. If you're buying into the hype about "sugar addiction" being bad for you, you may be doing something worse to yourself.
I discovered long ago, when doing various elimination diets to see if my problem was an undiagnosed food allergy, that in the weeks that I did without sugar, I couldn't think clearly.
Most (if not all) artificial sweeteners have their own health consequences.