There are other risk factors that cannot be controlled. Diabetes runs in families. This is something you cannot do anything about. If you fall into this category you will always be at a higher risk for diabetes. The situation is not hopeless however.
Exercise can help here too.
The offspring of diabetes were put on a schedule of exercise for six weeks. All of the individuals were insulin resistant. At the end of the study, their conditions were reversed and they were no longer insulin resistant. In short, they avoided diabetes. They also doubled the amount of glucose their bodies could convert into stored glycogen.