A great article in the New York Times makes the point that much of the tea consumed in the US is not all that healthy…? From the article
“But a 16-ounce bottle of the popular Arizona Green Tea with Ginseng and Honey, for instance, contains 140 calories and 34 grams of sugar. (By comparison, a similar amount of Coke has 194 calories and 54 grams of sugar.) A grande Tazo chai tea latte at Starbucks packs 240 calories and 41 grams of sugar.”
this is a benefit of brewing your own tea or drinking good quality leaf teas without all the additions.