Caffeine is a stimulant derived from plants. Many beverages -- and even some foods -- contain caffeine, and many people swear by the energetic effects it has on the body. Sometimes, however, too much caffeine can have unpleasant side effects. How much is too much? It depends on one's tolerance level. Keeping alert is critical for most of us, but if you notice unpleasant effects, it may be time to minimize the amount of caffeine you ingest.
Caffeine's most notable property is alertness, although too much can cross the line into nervous. Anxiety is a common side effect of too much caffeine, and many people experience jitteriness, rapid speaking, and feelings of unease. One thousand milligrams of caffeine is considered high for daily intake and can result in both physical and mental manifestations of anxiety. Psychologists have a name for this effect: caffeine-induced anxiety disorder. To mitigate these effects, reduce caffeine intake and drink lots of water to help move the caffeine out of your system. Brisk walking can also help release some nervous energy.
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