Coffee lovers now have a reason to cheer up. According to a study, drinking up to three cups of coffee or tea every day is safe and it also reduces the risk of stroke and irregular heart beat. So, if you are an ardent coffee or tea lover but advised to avoid caffeinated beverages due to your heart conditions, think twice. 

A single cup of coffee contains about 95 mg of caffeine. It acts as a stimulant to the central nervous system and works to block the effects of adenosine -- a chemical that causes atrial fibrillation (AFib).