I can't tell you specifically how much sugar is too much, but you should be more than okay with a few pieces of fruit in your diet. Blood sugar is a tricky thing, there is such an enormous problem with adult onset tyep two diabetes now because there is so much unnatural sugar in everything we eat. Sugars from regular whole food are generally good for your body, drinking 40 ounces of coke a day is not. Hell there's a good 1/2 pound of sugar in 40 ounces of classic coke. On top of the high average sugar intake, we're also not as well nourished. Your body uses a BROAD spectrum of vitamins and minerals to help regulate blood sugar, most significantly, chromium and vanadium. If you're deficient in one of those areas, you're much more likely to develop type II diabetes simply because your body doesn't have the proper tools (the minerals) to regulate and maintain healthy levels. I would worry less about the sugar in whole foods than in having good nutrition, and if you can adjust your diet away from most processed foods and sodas, then you should be okay if you're taking an adequete mineral supplement.