Reaching for coffee, soda or other caffeinated drinks in the middle of the day may not give you quite the boost you hope it will. Though caffeine may enhance your alertness and concentration, researchers at the University of California in San Diego say it probably doesn't do much to help your memory. In fact, caffeine may actually interfere with tasks such as remembering specific words or performing learned motor skills. In a study of 61 participants taught new words and a finger-tapping task in the morning, those who did not have caffeine in the middle of the day were able to remember the tasks better that afternoon than those who did have caffeine. Participants who took a nap in the middle of the day were even better at performing the tasks later.
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