Carrying the "high-consumption" or "low-consumption" variant of either gene may determine how much joe's required to get you roaring in the morning. To learn more about the two genes, how they function, and their impact on our everyday behaviors, read the full story at Slashfood.
Can't kick the twice-a-day coffee habit you've developed? Feel free to blame it on your parents. According to USA Today, scientists have identified two genes that play a role in how much coffee we drink on a regular basis.