Does Caffeine Make You Fat?

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Caffeine is classified as a central nervous system stimulant. Ingested in moderate doses, caffeine can increase alertness; it also can increase the amount of time it takes to fall asleep, cause headaches and nervousness, and reduce fine motor coordination.

Caffeine enters the bloodstream via the stomach and small intestine. Its effects can begin as quickly as 15 minutes after it is ingested. Caffeine stays in the body for hours – only about half of the caffeine is eliminated in the first 6...

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