Oh, that gene is definitely passive in me! I can't utter a word in the morning until I've enjoyed my very strong, black coffee (with no sugar). I sometimes have two coffees a day, but never more than that or I'd be wired to the moon, due to the strength I like. And it has to be in a small cup. I must have some Italian DNA.
I sometimes have tea too, especially when out hillwalking. I find it quite refreshing, and gently reviving when you're tired. But coffee is my preference.
Weirdly, I went for two years when I lost the taste for coffee and tea. Maybe that gene suddenly became more active.