Sugar Free Energy Drinks

I never really understood the concept of a sugar free energy drink. I don't imagine them to taste very good! However, I decided to do some research on them (particularly Amp Sugar Free because Amp makes my favorite energy drink) because they contain different levels of ingredients, and even some different ingredients altogether than some of the regular energy drinks do. According to Amp's website, this drink contains only 5 calories, no carbs or sugars, and only 71 mg of caffeine, as compared to the 80 mg in your average can. I have never tried this drink because I am not usually a huge fan of sugar free drinks, but according to most web reviews, it tastes almost exact to the original and still is considered a tasty drink, minus the calories! However, this drink also contains phosphoric acid, which your average amp does not. According to studies, phosphoric acid is known to lower bone density, and has even been linked to kidney stones and kidney disease. Reading up on this, I found that drinking an average of 2 soft drinks containing phosphoric acid per day more than doubled your chance of contacting kidney problems. The drink also contains sucralose which is an artificial sweetener. I also did some research on this, but the food and drug administration have found no links with sucralose causing adverse health effects when consumed over a lifetime on a daily basis. Well, at least that's good! So, I don't really think I am interested in ever trying Amp Sugar Free (and I;m sure my kidneys will appreciate that!), but i wanted to research it since it contains so many "new"ingredients.