PDF(Pubmed)
Abstract：
The spreading knowledge of the health benefits of coffee and the development of gastronomy with a wide range of coffees prompt an evaluation of their caffeine content in terms of safe intake. The study analyzed the caffeine content of popular coffees in comparison with recommendations for a safe single dose (200 mg) and daily caffeine intake (400 mg), and guidelines for drinking 3-5 cups of coffee per day. A total of 299 coffee samples from franchise shops and homemade coffees were tested. The \"takeaway\" coffees had a three times higher mean caffeine content (p < 0.005) compared to homemade coffees. Americano coffee was the \"strongest\" (143 mg caffeine/serving on average), while coffee prepared by pouring hot water over one teaspoon of ground coffee was the \"lightest\" (23 mg caffeine/serving on average) (p < 0.05). Over 200 mg of caffeine per serving was found in 4% of samples. Over 400 mg of caffeine would be consumed by people drinking \"on the go\" 4-5 servings of many types of coffee, except espresso. In this respect, homemade coffees are safer. Therefore, recommendations on drinking coffee should be more practical, and indicate not only the number of cups, but also the \"strength\" of various types of coffee, in order to avoid the regular intake of high amounts of caffeine.
摘要：
咖啡对健康有益的知识的传播以及各种咖啡的美食发展促使人们从安全摄入方面评估其咖啡因含量。该研究分析了流行咖啡中的咖啡因含量，并与安全单剂量（200mg）和每日咖啡因摄入量（400mg）的建议进行了比较。以及每天喝3-5杯咖啡的指南。总共测试了来自特许经营商店和自制咖啡的299个咖啡样品。与自制咖啡相比，“外卖”咖啡的平均咖啡因含量高三倍（p<0.005）。美式咖啡是“最强”（平均143mg咖啡因/份），而通过将热水倒在一茶匙研磨咖啡上制备的咖啡是“最轻的”（平均每份23毫克咖啡因）（p<0.05）。在4％的样品中发现每份超过200毫克的咖啡因。人们“在旅途中”喝4-5份多种类型的咖啡，会消耗超过400毫克的咖啡因，除了浓缩咖啡.在这方面,自制咖啡更安全。因此,喝咖啡的建议应该更实用，不仅指出杯子的数量，还有各种类型咖啡的“强度”，为了避免经常摄入大量的咖啡因。
