What actually happens inside your body after you drink an energy drink? Caffeine quickly enters your bloodstream and reaches your brain, where it blocks adenosine, the signal associated with tiredness. You may feel more alert while caffeine temporarily affects stimulation, heart rate, and blood pressure.
If the drink contains a large amount of sugar, blood glucose rises and insulin is released. But caffeine doesn't create new energy—it mainly reduces the feeling of tiredness. As its effects wear off, fatigue can become noticeable again.
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