Research shows that caffeine can increase mental alertness at work or while studying and can enhance performance on certain mental tasks. In addition to alertness and mental performance, caffeine may also improve memory and reasoning in sleep-deprived people. Caffeine will not give you unusual or “superhuman” abilities, but instead may help you reach your peak mental alertness.
Physical Performance & Athletes
Caffeine has been shown to improve athletic performance, including improving endurance and delaying fatigue. Just one cup of coffee, or an equivalent amount of caffeine, has been found to have a beneficial effect on some aspects of athletic performance, and studies of cyclists found various forms of caffeinated beverages to be effective for improving performance. Caffeine can help athletes achieve their peak performance, but not at a level above their current physical capability.