Energy Drinks???

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I've been drinking the rockstar energy drinks, the 10 cal. ones after a workout. It's 20 cal. per can and helps me get through the rest of the day seamlessly! Is this a bad idea? I don't drink any other caffeine or sugary drinks. I am wondering if it can make you feel bloated or hurt your weight loss in any way. I recenly started this and am really enjoying it, but I can't help but wonder if an afternoon nap would just be better? :/