We all know that healthy adults have consumed caffeine in coffee, tea, and chocolate for centuries. Caffeine has also been added to certain soft drinks for many years. These uses of caffeine are considered by most people to be safe, but the availability of caffeine in these products has been accompanied by a sense of boundaries and some health-related advice: Coffee has traditionally been thought of as a drink for adults; pregnant women have been advised to limit caffeine intake; and parents hav…