Genetics may help determine how much caffeine one craves, new research indicates, with differences in two specific genes driving people to consume more -- or less -- of the world's most popular stimulant.
New research suggests that individuals who carry a so-called "high-consumption" variation of either gene appear to drink more coffee, relative to those who carry a "low-consumption" variant.
"It's really an incredible story," said study co-author Dr. Neil Caporaso, branch chief of genetic epidemiology at the National Cancer Institute. "People don't really suspect it, but genetics plays a big role in a lot of behaviors, such as smoking and alcohol consumption. And now it turns out that it has a part in how much caffeine we drink."