Originally Posted by harvey_birdman
I think you mean steep. But are you suggesting the Mayo clinic is wrong? Why would they lie to us?
Read the table again — it clearly states that an average cup of green tea has more caffeine in it than the same cup of black tea.
Originally Posted by the_drizzle
They aren't lying, they simply didn't provide a complete explanation.
Black teas are typically brewed for 5 minutes, in hotter water, and often with more tea leaves...thus the end result typically has more caffeine.
If you brewed green and white teas the same, you would produce a cup with an equivalent amount of caffeine.
The point is that there is nothing inherent in black tea that makes it stronger.
There are certain types of leaves that are inherently stronger, but that is from how it is grown/harvested rather than oxidation.
Well, apart from the simple fact that you would not want to drink just about any high end black tea with an infusion of minutes or more, there is this: Black tea is basically the same tea as white or green, but is rolled/oxidized more, so if it is made properly, more caffeine will make its way from the leaves into the water. The rest of your statement is basically useless because we can go on forever argumenting caffeine amounts in teas with different amounts of leaves in a cup, obviously. Longer brewing times don't affect the amount of caffeine in a cup, by the way (given you extract longer than about 20 seconds). What does change, however, is he amount of tannins solved in whiter and thus the perception of the overall amount of caffeine. The effect is equal, though.
Rambo, because black tea has a broken up leaf structure, most of the caffeine is being extracted with the first cup. Green and white teas of high quality can be used several times. Having said that: Do you really, physically, need
the caffeine in your tea? If not, you might want to consider a mint tea which has a similar, refreshing effect but gives you the freedom of enjoying as much of it as you want. Be careful with spearmint, however, because it isn't really good for your stomach in high doses. Low menthol plants as apple mint are healthier.