hey all, what do you think on those fruit drinks that are more and more appeareing alongside of coffee in many cafe shops?

I tend to have a hankering for them, but am always wondering if that protein powder they throw in actually does anything? is it like a cruched diet pill or 'energy enhancer' as my mother's on about. It seems I never feel or notice any increased energy after having one, just a shiver from the coldness of the drink

Also, sometimes I feel more thirsty???