The U.S. Food and Drug Administration considers 400 milligrams of caffeine per day to be "safe." However, drinking an energy drink is not the same as drinking a coffee or soda. Energy drinks contain up to 500 milligrams of caffeine per bottle/can. Compare that to 100 milligrams of caffeine in one cup of coffee, or around 50 milligrams of caffeine in 12 ounces of soda. The … [Read more...] about How Energy Drinks Affect The Mind & Body