Sometimes energy drinks have the opposite effect and lead to tiredness because you “crash.” Find out why drinks without sugar ...

10 MINUTES: Once you consume an energy drink, the caffeine begins to enter your bloodstream, which increases your heart rate and blood pressure. 15-45 MINUTES: The caffeine level in your bloodstream ...

When you're dragging, it's tempting to reach for a drink that promises to put some pep in your step. But are energy drinks a healthiest way to get a boost? Here's the truth. Are energy drinks healthy?

(download full page) ENERGY DRINK LIFE CYCLE 10 MINUTES: Once you consume an energy drink, the caffeine begins to enter your bloodstream, which increases your heart rate and blood pressure.

10 MINUTES: Once you consume an energy drink, the caffeine begins to enter your bloodstream, which increases your heart rate and blood pressure. 15-45 MINUTES: The caffeine level in your ...