6. Anxiety Disorder

McGrane said caffeine is a stimulant that can worsen anxiety in some people, especially those who are prone to panic attacks.

"If you regularly experience anxiety or panic attacks, you may want to consider avoiding or reducing your intake of caffeinated coffee," he said.

Research from General Hospital Psychiatry found that higher levels of caffeine, about five cups of coffee per day, could potentially cause panic attacks in those with anxiety.