In North America, 90% of adults consume caffeine daily. Beverages containing caffeine, such as coffee, tea, soft drinks and energy drinks enjoy great popularity: caffeine is the world's most widely consumed psychoactive substance. Caffeine is a central nervous system (CNS) stimulant, having the effect of temporarily warding off drowsiness and restoring alertness. Overall, caffeine is found in the beans, leaves, and fruit of over 60 plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding upon them. It is found in the leaves and beans of the coffee plant, in tea, yerba mate, and guarana berries, and in small quantities in cocoa, the kola nut and the Yaupon Holly. Caffeine is sometimes called guaranine when found in guarana, mateine when found in mate, and theine when found in tea. Caffeine is a xanthine alkaloid compound that acts as a stimulant in humans. Caffeine Molecule C 8H 10N 4O 2 What is in coffee?
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