The quality of black tea is often related to pigments called theaflavins and thearubigins. Chemical examination of the thearubigins shows that they are polymeric proanthocyanidins.

A diet rich in magnesium, polyphenols, and vitamin B is linked to decreased odds of depression in older adults over time.

"Lychees contain proanthocyanidins, a type of antioxidant that contributes to health," she said. "These compounds have been studied for their potential to help lower LDL cholesterol, which is ...