Coffee drinking is in the genes

 "Researchers believe they have identified two genes that affect how quickly you 'metabolise' the stimulant and that in turn makes you crave more or less coffee.
Some 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.
The two genes in question are labelled CYP1A2 and AHR. The former has previously been linked to the process by which caffeine is broken down by the body, while AHR regulates the activity of CYP1A2.
'It's really an incredible story,' said co-author Dr Neil Caporaso, at the National Cancer Institute. 'People don't really suspect it, but genetics plays a big role in a lot of behaviours, such as smoking and alcohol consumption.
'And now it turns out that it has a part in how much caffeine we drink.'
Dr Caporaso along with colleagues from the Harvard School of Public Health and the University of North Carolina, reported these findings in the journal PLoS Genetics."
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