"Researchers surveyed over 260,000 adults aged 50 to 71 in the United States on their beverage habits. Ten years later, survey responders were asked if they had been diagnosed with depression. Of those who reported consuming four or more daily servings of artificially sweetened soda, iced tea, or fruit drinks, 31 percent had been diagnosed. Twenty-two percent of regular soda drinkers reported depression diagnoses. Coffee drinkers (four or more cups a day), on the other hand, were 10 percent less likely to suffer depression than non-coffee drinkers."