The most common sources of caffeine for most people are coffee, tea, soda and chocolate. The amount of caffeine in foods and drinks varies. For coffee and tea, the amount of caffeine per cup depends on the brand, the type of beans or leaves used, how it is prepared and how long it steeps. Most soda pops, not only colas, contain caffeine. Energy drinks are growing in popularity, particularly among teens and young adults. The caffeine content of these drinks ranges from 60 mg to more than 250 mg per serving.
Teenagers and young adults often drink energy drinks and/or large amounts of strong coffee, putting them at risk of consuming too much caffeine.