I think energy drinks (e.g. Monster, Red Bull, AMP, Kickstart) are HORRIBLE for your health, as someone who drinks them. It's absolutely true that it gives you

I think energy drinks (e.g. Monster, Red Bull, AMP, Kickstart) are HORRIBLE for your health, as someone who drinks them. It's absolutely true that it gives you a short term boost that you need to make up for. It spikes your blood pressure 5-15 points, overworks your heart, and kicks your metabolism and immune system into overdrive. One day is whatever - you just need 9 hours of sleep instead of 8. Two or three days, and you seriously can't function without it the next morning and start losing muscle mass, getting headaches, nose bleeds if you are prone to them, etc. As someone who used to drink them (and still do on occasion), none of this is an exaggeration. Furthermore, they absolutely ruin your teeth with the acidity. On-topic - the US army rangers did a study on caffeine specifically (among other substances) and found that it tightens up shot groups and increases response times. It is not, by any means, a placebo. Oh, and building up tolerance is a real thing too, of course.