Study: Caffeine harms glucose metabolism in type-2 diabetics

"Researchers from Duke University have conducted several studies into the effects of caffeine on people with type 2 diabetes... {they} found that while caffeine did not affect fasting levels of glucose or insulin response, it did worsen diabetic symptoms after the meal compared with the placebo. When taken with food, caffeine increased blood levels of insulin by 48 percent and increased blood sugar by 21 percent relative to the placebo... For people with diabetes, drinking coffee or consuming caffeine in other beverages may make it harder for them to control their glucose."

http://www.naturalnews.com/039930_caffeine_blood_sugar_type_2_diabetes.html