caffeine

I’ve been reading about caffeine lately. Here’s what I’ve learned so far (sorry about not citing my sources).

+ Tea is about 3% caffeine by dry weight.
+ Coffee is about 1-2% caffeine by dry weight.
+ Coffee by the cup generally contains more caffeine than tea by the cup because we use more coffee per cup than tea per cup.
+ A cup of black tea generally has more caffeine than a cup of green tea because the caffeine steeps out of black tea leaves more easily than it steeps out of green tea leaves.
+ Caffeine content in tea and coffee varies widely depending on where it came from, the variety of plant, the weather, and other things.
+ Dark roast coffee has more caffeine than light roast if you measure your portions by weight, but light roast coffee has more caffeine than dark roast if you measure your portions by volume.

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