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Caffeine-containing drinks, such as coffee, tea, and cola, are very popular; as of 2014, 85% of American adults consumed some form of caffeine daily, consuming 164 mg on average.

Caffeine can have both positive and negative health effects.

To make these drinks, caffeine is extracted by steeping the plant product in water, a process called infusion.Based on average body weights of children, this translates to the following age-based intake limits: Health Canada has not developed advice for adolescents because of insufficient data.However, they suggest that daily caffeine intake for this age group be no more than 2.5 mg/kg body weight.Minor undesired symptoms from caffeine ingestion not sufficiently severe to warrant a psychiatric diagnosis are common, and include mild anxiety, jitteriness, insomnia, increased sleep latency, and reduced coordination.Caffeine does not appear to be a reinforcing stimulus, and some degree of aversion may actually occur, with people preferring placebo over caffeine in a study on drug abuse liability published in an NIDA research monograph.

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