Diet and exercise can reduce the risk of becoming diabetic by more than a third, says a new study by the Nat’l Institute of Diabetes and Digestive and Kidney Diseases. Overweight study participants who cut calorie and fat intake and exercised at least 30 minutes 5 days a week cut their risk of getting diabetes by 34% vs. people who didn’t change their lifestyle. People over 60 got even more dramatic results, cutting their risk of diabetes during the study period by about half.