Caffeine does not increase hypertension

Dr Roberto Corti of the University of Zurich Hospital, who led the study, said: "until now we have blamed caffeine for the cardiovascular effects of coffee, but we have found that people who don't drink coffee usually have this effect when they drink decaffeinated coffee."

"it shows that we know very little about coffee, one of the world's most consumed stimulants and one of the most popular beverages," he said. "

The team found that any coffee, whether caffeinated or not, raises blood pressure in people who don't usually drink coffee much. They also found that when regular coffee drinkers drank caffeinated coffee, their sympathetic channels were stimulated, but their blood pressure did not rise.

The activity of the sympathetic nervous system can help regulate blood pressure. It is believed that hyperactivity of the sympathetic nervous system is associated with high blood pressure.