Actually, when I first read the title, I thought you were referring to combining alcohol (a downer) with an energy drink (an upper), such as a jager bomb (jagermeister mixed with red bull). I don't know, I guess I don't get what you're saying should be restricted.

I personally think the energy drinks are ok, just like coffee or soda, when consumed in moderation. Problem with energy drinks, coffee, soda, etc, is the simple fact that people are gluttonous over-indulgers (myself included...giving up soda while I'm pregnant has been surprisingly easy, but usually, I crave them).