This study seems to be about lowering the risk of getting it. But if you already have insulin insensitivity or diabetes, I think there are other studies that say you should avoid caffeine. One article I read somewhere was that caffeine can worsen insulin sensitivity enough to offset any metphormin which is supposed to improve sensitivity.

Here is a nice article I just read today in Low Carb Luxury Magazine titled “The Caffeine Controversy” by Cerise Cauthron. She doesn’t list her sources though. She addresses why people on low carb diets should avoid caffeine.
http://www.lowcarbluxury.com/magazi...07-no4-pg7.html

Here is an excerpt from the article:
“Caffeine promotes the release of fatty acids into the bloodstream; these are the components of a fat molecule that the body can use as fuel. This additional fuel keeps the circulating levels of glucose relatively high and reduces the body's tendency to dip into muscle glycogen as they normally do during exercise. For an endurance athlete, this means that the time before "hitting the wall" is delayed. This phenomenon occurs when the muscles have depleted their store of glycogen and the mobilization of fat for energy cannot occur sufficiently fast to keep the muscles fueled. The fatty acid release permits activity for an extended period of time. Caffeine also promotes the release of adrenaline, which boosts mental clarity, focus and concentration, release of liver glucose, reaction times and motor activity. Again, for athletes such as cyclists and runners, these effects provide significant performance benefit.

For a low carb dieter, though, these effects have a dark and sinister agenda. Consider:
• The release of fatty acids as muscle fuel reduces muscle uptake of glucose.
• At the same time, adrenaline encourages the release of liver glucose into the bloodstream.
• Adrenaline, itself, reduces glucose uptake by cells.
• Glucose levels stay high in the bloodstream, prompting continued release of insulin. “

........well...so, everything with moderation...hey?.........

Caffeine raises IR...end of story! Geez....

I second that.