Caffeine impacts everything from sleep quality to concentration and heart rate. Learn how long withdrawal takes, the diuretic effects on the body, and the potential risks of taking caffeine tablets with medication or alcohol.
Caffeine is the bitter substance that boosts the central nervous system to supply the energy that so many people rely on each day. While coffee may be the most familiar source of caffeine, guarana, an herb that comes from the Amazon rain forest, can provide the same energy-enhancing benefits.
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While caffeine can be used in a wide variety of foods and beverages, it is derived from a few main sources. Those sources include tea leaves, cocoa beans -- which are used to make chocolate -- kola nuts and coffee beans.
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If you're looking for some quick energy before a workout or a pick-me-up in the late afternoon hours, both a cup of coffee and a caffeine pill can do the trick. Caffeine stimulates the central nervous system and so speeds up mental and physical processes.
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Caffeine can affect the body and brain in a number of ways. While it is most commonly used for alertness and mental focus, caffeine consumption does have other possible side effects that should not be overlooked. Blood vessel constriction, also known as vasoconstriction, is one of these potential side effects.
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