喝咖啡最大的健康益处是患肝脏疾病(包括肝癌)的风险降低。
But Prof Paul Roderick, co-author of the study, said the review could not say if coffee intake had made the difference.
但研究报告的合著者保罗-罗德里克教授说，研究结论无法证实这种差异是否由咖啡导致。
"Factors such as age, whether people smoked or not and how much exercise they took could all have had an effect," he said.
他说：“年龄、是否吸烟、每天做多少运动等因素都有影响。”
The findings back up other recent reviews and studies of coffee drinking so, overall, his message on coffee was reassuring.
这一研究结果支持了最近的其他几项有关喝咖啡作用的综述和研究，因此从总体上看，研究结果是可靠的。
"There is a balance of risks in life, and the benefits of moderate consumption of coffee seem to outweigh the risks," he said.
他说：“生活中各种风险之间存在平衡，适量饮用咖啡的益处看来比风险更大。”
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.
英国国民健康保险体系建议孕妇每天摄入的咖啡因不超过200毫克，也就是两杯速溶咖啡的量，因为摄入咖啡因太多会增大流产风险。
This review suggests women at risk of fractures should also cut back on coffee.
研究建议有骨折风险的女性也要少喝咖啡。
For other adults, moderate caffeine intake equates to 400mg or less per day - or three to four cups.
对其他成年人来说，每天摄入的咖啡因最好少于400毫克，大约相当于三到四杯咖啡。
咖啡中有多少咖啡因?
one mug of instant coffee: 100mg
一杯速溶咖啡：100毫克