evidence: Claim: Tumors prefer sugar for energy and will use more than normal cells. Consuming sugar can result in cancer growing and spreading more quickly. Avoiding all sources of sugar will inhibit cancer cells. [...] While researchers continue to investigate the connection between sugar and cancer, there is accumulating evidence that sugar consumption is associated with increased cancer risk, recurrence, and mortality. Specifically, high blood sugar levels lead to conditions such as high insulin levels and obesity, which both increase the risk for cancer. [...] - A case-controlled population study, conducted in Malaysia, with 382 breast cancer patients and 382 controls showed a 2-fold increased risk of breast cancer among both pre and post-menopausal women who had the highest intake of sugar (more than 61 grams, or 15 tsp, per day) (8). There was no association observed between total carbohydrate intake and cancer risk. The investigators concluded that this was most likely due to the fact that the Asian Diet is typically high in carbohydrates.