TOKYO --
University researchers in Tokyo have found that green tea may help boost your mood.The study, released Monday, focused on the tea's effects on people 70 and older. Researchers found that those who drank four of more cups of green tea a day were 44 percent less likely to have symptoms of depression.
The key may be an amino acid in green tea that is thought to have a tranquillizing effect on the brain.
The study found no "feel good" effect from black tea or coffee.