I drink one of those "sugar-free" energy drink (I think it has Vitamin B and other nutrients) in the morning if I cannot brew my coffee (due to lack of time). I am curious to know if those "energy drinks" are actually effective in get you going (meaning, increasing your energy). Is there a science behind this? Or, is it just a marketing gimmick? Edit: Mod, please correct the spelling on my title (somehow, it is spelled wrong there).