I collected these articles for your interest. Harvard University researchers followed more than 80,000 women for 10 years and found indications thatcoffee can be a positive picker upper. The study of female nurses found 11 suicides among those who drank two to three cups of caffeinated coffee per day, compared with 21 cases among those who said they almost never drank coffee. Similar benefits were associated with the caffeine in cola, tea, and chocolate when consumed in the same quantities as that in coffee. That interpretation, Kawachi said, may be a little premature.
Caffeine is the most widely used stimulant in the world.
It acts on the central nervous system and has mild anti-depressant effects. So psychiatrists say it's not surprising that habitual coffee drinkers report feeling better and less irritable after their morning fix. But they say people shouldn't count on it to relieve depression. Psychiatrist Dr. Wayne Blackmon said people need to realize that depression is a serious clinical problem that cannot be resolved simply by using caffeine. And some doctors tell heart patients and people with other health problems to steer clear of caffeine.