Drinking coffee for diabetes mellitus?

Coffee – especially decaffeinated – is said to protect against type 2 diabetes. That's the finding of researchers from the University of Minnesota in a study that looked at diabetes risk and coffee consumption in 28,812 postmenopausal women over an 11-year period.
None of the participants had diabetes or cardiovascular disease at the start of the survey. However, over the course of the study, 1,418 women reported having newly diagnosed diabetes. Study leader Mark Pereira and his team were able to establish a significant connection between coffee dose and risk minimization in most cases.
Participants who consumed more than six cups a day had a 33 percent lower risk of developing diabetes mellitus than non-coffee abstainers, according to their observation. The researchers also report that this connection is consistent across different age groups and also with different body weights.
However, it is still questionable which ingredient in the pick-me-up is responsible for this effect. Finally, in addition to caffeine, the beans and their extract are known to contain a number of minerals and antioxidants that are reputed to have a positive effect on the metabolism.