Coffee: It's not truly addictive

While many people claim that they can't make it through the day without a few cups of java, Liz Applegate, PhD, faculty member and director of sports nutrition at the University of California at Davis, explains that caffeine is not addictive.

"Caffeine is a mild stimulant, and the World Health Organization states that it is wrong to compare caffeine intake to drug addiction, since people can reduce or eliminate caffeine from their diet without the serious psychological or physical problems that result from a true addiction."

However, serious coffee drinkers may experience symptoms such as fatigue and irritability if they reduce their intake. According to Dr. Applegate, people who consume 600 milligrams of caffeine (about six small cups of coffee) daily are most likely to experience these symptoms, but they will usually resolve themselves after a few days.