The naturally-occurring substance with a bitter taste stimulates the central nervous system, making you feel more alert. In moderate doses, it can actually offer health benefits, including boosts to memory, concentration and mental health. And coffee in particular, a major source of caffeine for Americans, has been associated with a host of body perks, including a possible decreased risk of alzheimer's disease and certain cancers.
But in excess amounts, caffeine overuse can trigger a fast heart rate, insomnia, anxiety and restlessness, among other side effects. Abruptly stopping use can lead tosymptoms of withdrawal, including headaches and irritability.
Below are 10 lesser-known facts about one of the most common drugs in the world./.../