咖啡
超过50%的美国人每天喝咖啡。一杯咖啡中的咖啡因含量含量不同,这取决于特定品牌的强度和酿造方法,这决定了咖啡因的集中程度。咖啡杯的大小还将确定它包含多少咖啡因。
A shot of espresso, the strongest type of coffee, contains about 50mg of caffeine per fluid ounce. Since a shot is only 2 ounces, the caffeine total is 100mg. That's the same amount as an 8-ounce cup of brewed coffee. Instant coffee has about 50mg per 8-ounce cup.
Tea
Different types of tea vary from high levels of caffeine to none at all (herbal teas). Plain tea, usually an Orange Pekoe or black tea blend, contains about the same amount of caffeine as instant coffee—50mg per 8-ounce cup. But if you steep your tea for longer, you get a stronger beverage. So the amount of caffeine in an 8-ounce cup of tea varies from 20mg to 80 mg.
Per 8-ounce cup:
- Chai: 60mg to 120mg of caffeine
- Assam红茶:约80毫克
- 伯爵灰色:约50毫克
- Darjeeling tea: About 50mg
- 乌龙:40毫克
- 绿茶:25毫克
- 白茶:15毫克
Iced tea contains caffeine in amounts similar to brewed tea, depending on the type of tea. But it is often consumed in larger amounts.
巧克力
巧克力中咖啡因的量因品牌和巧克力类型而异。平均而言,牛奶巧克力每100克含有约18毫克的咖啡因(约3.5盎司)。这似乎并不多,但它很容易加起来。
Dark chocolate contains much more caffeine than milk chocolate, upwards of 70mg of caffeine per 100g bar (almost as much as a cup of coffee).
一些厂家将额外的咖啡因添加到巧克力中,产生更强的咖啡因,通常每件咖啡因在100毫克咖啡因约约100毫克,大约与您拍摄的浓缩咖啡射击相同。其他类型的咖啡因加载的糖果,薄荷和口香糖可供选择。白巧克力通常不含咖啡因。
能量饮品
能量饮品通常以一种强调其咖啡因含量的方式销售,但它们含有的实际咖啡因量很大。有些含有大约与茶或咖啡相同的金额,每份50毫克到100毫克,而其他人则包含更多。
始终检查标签
小心能源饮料营销自己,因为你可以无意中消耗大量的咖啡因如果你不检查标签。谨防糖含量,服务大小,小打印和难以读取的标签。