According to a study whether or not you're caffeine junkie is in part determined by your genes.
The study identified two genes associated with the amount of caffeine people consume. Both of the genes are known to be involved in the breakdown of caffeine in the liver.
The findings suggest one of the main reasons why some people drink more caffeine than others is that the heavy drinkers are better able to tolerate it. While both the liver and the brain influence caffeine consumption. However, it turns out that your liver, more than your brain, determines daily caffeine intake. If your liver breaks it down very rapidly, then likely you drink more.
Studies on twins have suggested that the amount of caffeine a person drinks is, in part, hereditary. But researchers didn't know what genes determine this caffeine preference.
The study scanned the genes of more than 47,000 individuals. Participants answered questions about how much coffee, tea, soda and chocolate they consumed.
The researchers identified two genes, CYP1A2 and AHR that are associated with caffeine intake. Everybody has these genes, but some people have variations that are more active than others. People with the most active versions of these genes drank about 40 milligrams more of caffeine than did people with the least active version. That's equivalent to an 8-ounce can of Diet Coke.
More about the study.
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