Coffee consumption has often been linked to a risk of high blood pressure, but the latest research shows that moderate consumption of the beverage, even over a period of 30 years, has little or no impact on hypertension.
According to a report on BBC News Online, the study carried out by researchers at Johns Hopkins University suggests that a couple of cups of coffee a day may do no harm.
The researchers investigated the effects of coffee consumption on 1,000 or so white males who graduated from the university's medical school between 1948 and 1964, the report said. The vast majority of the graduates were coffee drinkers - drinking, on average, about two cups a day.
Their coffee intake was checked more than 10 times over the following three decades to see whether any increases in blood pressure could be linked to increases in coffee consumption. The researchers found that there was no evidence that coffee could be connected to anything more than tiny increases in blood pressure.
The research from the US is the latest in a long line of studies focusing on the beneficial or detrimental effects of coffee. The BBC report said that pregnant women in the UK were recently advised to drink no more than four cups a day because of worries that heavy consumption could increase the risk of miscarriage, and also cited reports claiming that coffee may contain chemicals linked to heart attacks and strokes.