Can the daily cup o' Joe help to ward of depression? Well, this is the suggestion published in the Archives of Internal Medicine by Harvard Medical School researchers. As with all such research the authors prefer a fence-sitting approach by stating it's far too early to rush out and brew more coffee. Even so, their declared caution is offset by the claim that those who drink four or more cups of coffee (caffeinated) a day cut their risk of depression by 20 percent.

We're used to trends in...