* It can increase mental alertness: Studies performed on people in stressful conditions showed improved concentration, learning and reaction time after 200 mg caffeine. In addition, there is some evidence that it can delay onset of Alzheimer's disease.
* It may reduce risk of some diseases: Drinking coffee, though apparently of both caffeinated and decaffeinated types, is associated with a reduced risk of type 2 diabetes. It is also associated with a reduced risk of some types of cancer.