So, as a contraceptive method, its success is limited! However, doctors do not recommend doing so because: The person who suffers from this complaint features a problems in which the glucose content in the blood is too high. This situation occurs because the body's either not able to produce enough insulin, produce no insulin, or has cells that does not answer the insulin the pancreas produces. As a result, an excessive amount of sugar builds in the blood. The excess blood sugar passes from the body through urine. So, although the blood has plenty of glucose, cellular structure didn't get the glucose for that element energy and growth.