Good news for coffee lovers: not only does coffee not dehydrate you, but it could also improve your heart health. And an as-yet unpublished, all-women study has found that it’s been linked to ageing well, too.The research, presented at the annual meeting of the American Society for Nutrition this year, tracked the health of 47,000 female nurses over 30 years via the decades-long Nurses’ Health Study.Women were asked about their dietary and drinking habits (ie. whether they drank tea, coffee, and/or fizzy caffeinated beverages) every few years. By 2016, scientists looked at which of the study participants met their standard of “healthy ageing”.Speaking to The New York Times in response to the research, professor of nutritional epidemiology at Tufts University, Dr Fang Fang Zhang