Drinking caffeine

Many US adults rely on drinking caffeine in the morning to jump start their day.  While caffeine works well to wake people up, too much caffeine can have negative effects on your health.  These can include increased stress on your heart, irritability, and headaches.  Also, patients with high blood pressure or other cardiovascular diseases should limit caffeine intake, as it can worsen those diseases. According to the Mayo Clinic, caffeine doses up to 400mg per day appear to be safe.  This amount of caffeine equates to around four cups of coffee or 10 cans of pop.