給你潑點冷水,不要喝太多咖啡

Researchers say caffeine is the most widely consumed drug in the world, and coffee is a major source. Despite this, there are few guidelines about how much caffeine is too much, and even low doses may adversely affect some people.

People with certain medical conditions, including high blood pressure and heart arrhythmia, as well as those taking certain prescription medications are advised to avoid or limit caffeine.

http://www.webmd.com/diet/news/20061011/decaf-coffee-isnt-caffeine-free