Struggling to get through the day without multiple cups of coffee? You're not alone. A recent study by Scottish researchers reveals that our genetic makeup may drive coffee addiction.
To determine how genes influence caffeine consumption, scientists analyzed DNA from over 1,100 participants in northern and southern Italy. Each reported their daily coffee intake. They found that light drinkers—averaging one fewer cup—carried a variation in the PDSS2 gene. This finding was validated in a follow-up study with more than 1,700 people in the Netherlands, though differences in consumption were subtler.
The PDSS2 gene regulates the body's ability to metabolize caffeine. In those with the variation, caffeine lingers longer, reducing the need for frequent doses. Cultural differences explain variations between groups: Italians favor potent espresso shots, while the Dutch opt for larger cups with higher caffeine loads, delaying the urge for more.
Researchers plan larger-scale studies to solidify this genetic link. It explains why some crave coffee hourly, while others thrive on one cup daily.
