They don't call it "Central Perk" for nothing. As a central nervous system stimulant, caffeine doesn’t just boost alertness, it can also improve your mood.

Several studies have even found a connection between caffeine consumption and a reduced depression risk, as well as an even a lower risk of suicide. However, at least one of these studies specifically found this connection with caffeinated coffee but not tea, though others found the same effect for tea as well.