A group of researchers from northwestern University in Chicago have figured out why some people coffee invigorates, while for others coffee is just a drink with a pleasant smell and taste.
In the study, scientists analyzed information on 10 thousand inhabitants of Europe. It turned out that there is a genetic background "caffeine addiction". Certain genes affect the perception of coffee and caffeine is metabolized in the body.
As a result, one person can drink a Cup of coffee and not sleep all night, and the other to consume a few servings and safely go to sleep. Interest is the duration of action of caffeine as much difference depending on the genetic set of rights.
In another study, the researchers acknowledged the benefits of small batches of high quality coffee. At least one Cup of coffee in the morning in the absence of diseases of the cardiovascular system is not exactly hurt.