Black Tea Alkaline Diet
Black tea, like coffee, produces an acidic effect on the body and should generally be avoided on an alkaline diet. Black tea does, however, help the body use vitamin B15, a cancer-fighting acid, and is included on some alkaline diets for this reason. No food or beverage is completely banned on an alkaline diet, and you can keep your body in pH balance by consuming black tea with foods that make it more alkaline.
Credit: Livestrong.com Website