Caffeine Energy

Caffeine has no calories, so it doesn’t actually give you a burst of energy. It just feels like it does because it prevents the feeling of being tired.

Caffeine binds to the same place in your brain that adenosine molecules would. Adenosine is what causes your brain to “start feeling sleepy.” Due to caffeine when adenosine can’t bind to those receptors, your brain doesn’t get the “bedtime” signals. The resulting extra adenosine in your bloodstream then triggers your adrenal system to release more adrenaline, which then affects the dopamine system in your brain, which results in you feeling happy/good.