Energy drinks: On the ropes?

Concerns about energy drinks have been gathering pace, with some groups, particularly in the U.S. and the UK, now calling for them to be more tightly regulated and for greater public awareness of what they contain, their potential side-effects and risk of addiction.
Although their history dates back to the early 1900s, energy drinks started coming into vogue in the 1970s and 1980s as performance-enhancing products sought by young people who wanted to prolong their enjoyment of physical activities.
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Perhaps I've been under a rock (altogether possible) but I'd never heard of these drinks containing alcohol. Four Loko? Never heard of it. Which I guess is a good thing.