"Fruit consumption and risk of type 2 diabetes: results from three prospective longitudinal cohort studies"
BMJ Aug 29
http://ww w.bmj.com/content/347/bmj.f5001 
"Conclusion Our findings suggest the presence of heterogeneity in the associations between individual fruit consumption and risk of type 2 diabetes. Greater consumption of specific whole fruits, particularly blueberries, grapes, and apples, is significantly associated with a lower risk of type 2 diabetes, whereas greater consumption of fruit juice is associated with a higher risk."