The funny thing is, regular coffee consumption might result in lowers odds of getting type 2 diabetes because of all the antioxidants. The antioxidants reduce inflammation in the body. Inflammation can increase a person's chance of getting diabetes.
WebMd concludes:
If you already have type 2 diabetes, this may not hold true. The caffeine in a cup of java makes it tougher to control your blood sugar. If yours spikes after your morning cup, you may want to switch to decaf. Even though this drink has a tiny amount of caffeine, it doesn’t have the same effect on your blood sugar or insulin.