研究表明 一天3杯咖啡最健康
Moderate coffee drinking is safe, and three to four cups a day may have some health benefits, according to a large review of previous studies, in the BMJ. Too much coffee during pregnancy could be harmful, the review confirmed. Experts said people should not start drinking coffee for health reasons or to prevent disease. The University of Southampton researchers collected data on the impact of coffee on all aspects of the human body, taking into account more than 200 studies - most of which were observational. Was it the coffee? Compared with non-coffee drinkers, those who drank about three cups of coffee a day appeared to reduce their risk of getting heart problems or dying from them. The strongest benefits of coffee consumption were seen in reduced risks of liver disease, including cancer. But Prof Paul Roderick, co-author of the study, from the faculty of medicine at University of Southampton, said the review could not say if coffee intake had made the difference. "Factors such as age, whether people smoked or not and how much exercise they took could all have had an effect," he said. The NHS recommends pregnant women have no more than 200mg of caffeine a day - two mugs of instant coffee - because too much can increase the risk of miscarriage. At present, the researchers said pinning down exactly how coffee might have a positive impact on health was "difficult". |