People with type 1 or type 2 diabetes have an increased risk of developing some forms of cancer. Researchers at the American Chemical Society report a possible explanation for this double whammy. They found that DNA sustains more damage and gets fixed less often when blood sugar levels are high compared to when blood sugar is at a normal healthy level. This increases the risk of cancer. According to them it's been known for a long time that people with diabetes have as much as a 2.5-fold increased risk for certain cancers. These cancers include ovarian breast kidney and others.