Caffeine As can be seen above, caffeine consists of two carbon/nitrogen rings with oxygen and methyl groups as substituents. The fused rings are similar to those in adenine only the substituents differ. Caffeine is found in coffee, tea, and many soft drinks. There is also some amount of caffeine in chocolate, as well as a closely related stimulant, theobromine. The caffeine in sodas is generally produced from the cola berries, and is either a …showed first 75 words of 414 total…

…showed last 75 words of 414 total…Smith et al 4 who conducted a study in 1993 to examine the effects of coffee on daytime and night-time performance and alertness. The results clearly demonstrated that caffeinated coffee had a beneficial effect on alertness and improved performance in a variety of tasks in both day and night sessions. These effects are especially beneficial to night shift workers as it is known that many industrial accidents occur late into the shift when workers become less attentive.