thoughts on sugar free energy drinks

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so I have eliminated all the "fun foods" (AKA~ junk) from my diet. I am a coffee drinker but most days I don't want to waste my calories on a mocha. I have started supplementing my caffeine addiction with sugar free energy drinks. They only have 20 calories and so they have become my new "fun food". I am aware that they are not real good for me but I'm wondering..... HOW BAD are THEY? Thoughts?!?

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