Pre-diabetes is a serious medical condition that can be treated.  The good
news is that the recently completed Diabetes Prevention Program study
conclusively showed that people with pre-diabetes can prevent the
development of type 2 diabetes by making changes in their diet and
increasing their level of physical activity.  They may even be able to
return their blood glucose levels to the normal range.

While the DPP also showed that some medications may delay the development of
diabetes, diet and exercise worked better.  Just 30 minutes a day of
moderate physical activity, coupled with a 5-10% reduction in body weight,
produced a 58% reduction in diabetes.

The American Diabetes Association is developing materials that will help
people understand their risks for pre-diabetes and what they can do to halt
the progression to diabetes and even to, "turn back the clock."  In the
meantime, ADA has a wealth of resources for people with diabetes or at risk
for diabetes that can be of use to people interested in pre-diabetes.

http://www.diabetes.org/diabetes-prevention/how-to-prevent-diabetes.jsp