system
Given the following post, respond as if you're commenting on Reddit:
human
How exactly do energy drinks (like Red Bull) interact with the body? How do they keep you awake, and what makes them unhealthy?
gpt
In addition to caffeine, many energy drinks contain "megadoses" of B vitamins, which act as stimulants. A serving of 5-hour energy has over 8000% of the daily value of vitamin B12. You might think that this is dangerous, but since B vitamins are water soluble, your body can't store them very well. Fat soluble vitamins, on the other hand, can build up and reach toxic levels if consumed in excessive amounts.