The three most important are coffee, tea and cocoa. All three are stimulating beverages, all contain caffeine and related compounds. It is not clear if health problems are caused by consumption of moderate amounts of caffeine.
Heavy consumption can cause anxiety, dizziness, insomnia, and heart palpitations.
Inclusion of caffeine in soft drinks is a questionable practice since children have low body mass and consume large quantities of soft drinks. Coffee Coffea - native to E. Africa, used first in Ethiopia although coffee is not widely used in Africa now. Arabs were first to brew coffee and use spread from Arabia to Egypt and then to Europe. Coffee was particularly popular in England Arabs monopolized trade by boiling seeds to kill them but Dutch and French were able to obtain seeds and grow the trees themselves. Brazil currently leads the world in coffee production.