29+ How Much Caffeine In Green Tea Vs Diet Coke Background. Caffeine is the only drug that is present naturally or added to widely consumed foods (quinine is the other drug used in foods). How much caffeine is too much?
How much caffeine can you have a day?
I know it's more than you asked for but it gives you a good idea of how much caffeine is in these drinks. How much caffeine is in a can of diet coke? Caffeine is a part of more than two hundred thousand medicines. Like other teas—and coffee!—the amount of caffeine in a cup of matcha can vary, says nutritionist keri gans, rd, author of the small change diet.