Can you face the day without a caffeine fix? Or do you walk around in a haze like an extra in a zombie film until you've gotten your daily coffee drink? If drinking coffee is an essential part of your daily routine, you might be genetically wired to consume more caffeine than average.
How it works
When it's time to hit the sack (or just take a nap) our bodies let us know by firing off a molecule called adenosine. Caffeine helps perk us back up by blocking adenosine's signals.
The genetic link
Scientists have identified genetic variants that influence how your body handles caffeine. These variants are located near two genes: CYP1A2 and AHR. Variants in these genes may affect how quickly the body breaks down and clears away caffeine.
Did you know?
Caffeine interferes with the brain system that causes sleepiness. A molecule called adenosine acts as a signal between brain cells to bring on sleepiness. Caffeine blocks adenosine's signals, making you feel more alert. This is also why caffeine can make it hard to fall asleep and interfere with deep sleep.
Have you ever wondered why you drink more or less caffeine than your friends? 23andMe's Health + Ancestry Service can help you learn about genetic factors that may be involved. Order a kit, send us your spit, and find out what your genetics predict about your caffeine consumption level.