Research studies have broadly documented a wide range of metabolic effects of caffeine. For example, caffeine boosts the effects of some neurotransmitters that are known to affect levels of concentration. it also increases the release of catecholamines (i.e. adrenaline), which contributes in increasing heart rate, blood flow to muscles, and sugar into the bloodstream. However, the many metabolic effects of caffeine makes it difficult to pin point which, exactly, are responsible for the energy boost many users experience.
First, it is important to note how the body works without caffeine. Inside the brain is a chemical called adenosine. This particular chemical, when released, stops the release of other chemicals–dopamine and adrenaline (which work as natural stimulants to the body).
Now when caffeine enters the body, it blocks the body’s receptors for adenosine; which, in turn, stops the releasing of adenosine into the body. With this chemical halted, more adrenalin and dopamine (which makes adrenalin) are present throughout the body, getting the desired affect of being awake and alert.
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