The effects of caffeine consumption have long been debated. Some say adults can safely consume one to two cups of coffee daily, while others maintain up to three cups (less than 300 milligrams of caffeine) may be safely consumed.
Energy drinks may have more — or less — caffeine than an 8-ounce, drip-brewed cup of coffee. The International Food Information Council reports coffee may have 65 to 120 milligrams of caffeine while an 8 1/3-ounce energy drink may have 50 to 200 mg of caffeine.
Determining how much caffeine a person consumes per day requires factoring in daily servings of beverages, such as soft drinks, energy drinks, coffee and tea; foods like chocolate; and over-the-counter drugs. To help individuals figure out their consumption, The Caffeine Awareness Alliance offers a Caffeine Calculator at www.caffeineawareness.org/calcu.php.