It doesn't take a rocket scientist to figure out why so many people are developing diabetes. Genes do play a role, but the less exercise you get and the more you weigh, the greater your risk. If you aren't part of the "diabetes epidemic" yet, congratulations. But there's a shadow epidemic of prediabetes—elevated blood sugar that's not yet high enough to trigger alarms—that you should worry about now. Here are eight things you can start doing today to help prevent diabetes.