Caffeine Addiction - How Much Does It Take?

For many, caffeine is the jolt needed to start the day.

But according to a new Time Magazine report, there are some surprising things you may not know about caffeine what's being called "America's favorite drug."

When it comes to caffeine levels, Starbucks coffee tops the list. It typically has more caffeine than energy drinks like Red Bull. In fact, a 16 ounce Monster or Rockstar drink only has about half the amount of a Grande Starbucks coffee.

And here's something that may surprise you.

Even though we have coffee shops on almost every street corner, we drink less coffee now than people did in the 19-50's. Even so, coffee still accounts for about two-thirds of our caffeine intake.

But perhaps most interesting of all, it doesn't take much to become dependent on caffeine.

As little as 100 milligrams a day is enough to get you hooked.