Caffeine: is it dangerous to health?
Abstract   Caffeine is a drug that is a common ingredient of popular foods, beverages, and over-the-counter as well as prescription medications. While at least 30% of Americans consume a moderate amount (200 mg. a day, about two cups of coffee), many others function with a much higher intake, 600 mg. or more (six or more cups of coffee). Researchers are discovering that caffeine may not be as safe as many people believe, since the substance has widespread effects on many body systems. It has also been linked to a variety of ailments, among them anxiety and hypertension, although information linking caffeine to cancer and birth defects is still speculative. In light of the expanding body of knowledge on the deleterious effects of caffeine, individuals should moderate or eliminate their intake of major caffeine-containing foods, beverages, and drugs. Health promotion programs can assist in this goal by providing education and support.
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Watson