In our study, if every woman ate a healthy diet, exercised a half hour a day, was not overweight, did not smoke, and drank a small amount of alcohol, over 90 percent of diabetes cases would have been eliminated...This is, of course, a hypothetical concept.
--Frank Hu, HSPH, Harvard School of Public Health

There you have it, diabetes 90% eliminated with a few small lifestyle adjustments. This analysis is based on data from 80,000 nurses followed over 16 years for the development of diabetes as correlated with their daily habits.