Coffee is one of the most popular drinks in the world, and its high levels of caffeine are among the main reasons why. It's a natural stimulant that provides an energy buzz, and we just can't get ...

Caffeine is generally safe to drink up to 400 milligrams a day, according to the Food and Drug Administration (FDA). That's equivalent to about four or five cups of coffee. For the average person, ...

For many people, a day doesn't start unless they've had their cup of coffee, but this morning staple is often followed by a trip to the bathroom. In a small 1990 study, coffee stimulated a bowel ...