Caffeine is a drug that is naturally produced in the leaves and seeds of many plants. It’s also produced artificially and added to certain foods. Caffeine is defined as a drug because it stimulates the central nervous system, causing increased alertness. Caffeine gives most people a temporary energy boost and elevates mood.

Caffeine is in tea, coffee, chocolate, many soft drinks, and pain relievers and other over-the-counter medications. In its natural form, caffeine tastes very bitter. But most caffeinated drinks have gone through enough processing to camouflage the bitter taste.

The following effects are commonly attributed to caffeine:

1. Stimulates your heart, respiratory system, and central nervous system.
2. Causes messages to be passed along your nervous system more quickly
3. Stimulates blood circulation
4. Raises blood pressure
5. Increases alertness and stamina
6. Increases the ability to stay longer without sleep