I've got pain in my body

Energy drinks usually have less caffeine than a normal cup of coffee. To a certain extent - that's not fair. I would want them too have more caffeine when not more than a cup of coffee.

But let's look at it from another perspective: If you love caffeine, no matter in which substance (either it's a coke, a cup of coffee, an energy drink or whatever else contains caffeine), but you usually feel more like drinking beer all day long, why not replacing the beer with an energy drink? Keep drinking energy whenever your head tells you, you need a beer. So, in this case, it's rather good that energy drinks don't have that much caffeine. Imagine you would drink coffee for each beer you would drink (assumed you have 10 bottles a day), your body wouldn't be able to handle all the caffeine.

So, energy drinks have less caffeine than coffee but what makes energy drinks better is this fact of less caffeine because you can drink more of it than you could drink coffee.

Another point for energy drinks: When they're cooled, they're even tastier which is good in summer ;)