Highly variable: and depends on dose of caffeine and the individual biology of the person. Caffeine is structurally related to the body's own stimulants that are produced by the adrenal gland - norepinephrine and epinephrine - and may also increase the production of cortisol by the adrenal as well, further potentiating the "flight or fight" response. Short-term more energy, long-term perhaps more fatiguability.
Answered 10/9/2014
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A doctor has provided 1 answer
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