Caffeine is the most popular psychoactive substance in the world and one of the widest-traded commodities in the forms of coffee, tea, and soft drinks. But, is consumption of caffeine safe in terms of physical and mental health? Aimed at addressing this question, author Jack E. James traces how caffeine consumption evolved as well as how caffeine is absorbed, distributed, and metabolized in our bodies. He then probes the effects of caffeine on psychomotor...