I heard this on NPR this morning:
Because of genetic differences, some of us metabolize caffeine much more quickly than others.
That is it.
That is why I'm able to drink espresso at 9pm and still go to sleep.
That is why I can have about 12 cups of coffee a day and not feel my heart racing—or any effects of the coffee itself.
That is why when people say, "I just can't function in the morning until I've had my coffee," I cannot relate. I can function at 5:05. I can function at 7:00. I can function at 2:00pm, when, according to that 5-hour Energy drink commercial, I should be crashing and wishing for more...well, energy.
It is, as many things are {including whether you're an early bird or a night owl}, because of genetics.
I must metabolize caffeine as fast as hummingbirds can flap their little wings. In other words: so fast, it's practically invisible. A blur of metabolizing.
I think someone should study me. You know, some scientist.
As a bonus, then I could drink lots of coffee. Which we all know I need to do more of.
In the meantime, you can read more about the story on NPR here.
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