Energy drinks, despite having caffeine and Taurine in them from that famous brand that gives you wings :) were actually band from the British Military as some guys would drink them during their fitness assessments and ended up dehydrated and on occasions it resulted in Fatalities.

I mean if you were happy to put 16 teaspoons of sugar in each coffee then i guess there wouldn't be that much difference. ( Rockstar has about 32g (8 teaspoons)sugar per serving)