I read the Caffeine Roundtable (Strength Training, Bodybuilding & Online Supplement Store - T NATION) a while ago and left with the impression that caffeine decreases insulin sensitivity and thereby increases insulin resistance and JB states “coffee drinking will [not] cause “clinical diabetes” or clinical insulin resistance.” Confusingly enough, JB also says, “we all agree that sedentary individuals and those prone to diabetes are most at risk for caffeine induced insulin resistance.”
Then, this morning I hear a brief story on Good Morning America regarding coffee and diabetes. I say to my roommate, “look, the main stream media has finally caught up with T-Mag and JB!” I’m thinking the story will be about coffee and the increase likelyhood of type II diabetes. But no, according to GMA coffee intake will actually decrease chances of type II diabetes. And this article Coffee cuts diabetes risk.
I looked for the source of the reports and it appears to be Lancet. 2002 Nov 9;360(9344):1477-8 at PubMed Coffee consumption and risk of type 2 diabetes mellitus - PubMed.
Now, I’m really confused or just don’t understand diabetes and insulin. If I understand correctly, type II diabetes is caused by insulin resistance. But, these damn 7-cup a day habit Dutchers seem to be protected from type II by drinking a crap load of it. How can this be?