I had too switch because my doctor said my triglycerides were waaaayyyyyyyyyyy too high and I needed to cut down my carb intake, so, out with the sugar drinks, and desserts. That doctor was putting his life in my hands with that recommendation since I had been a bicycle racer among other things, and carbs were essential to my success, so to change to diet drinks was truly a killer. But, I did, and now, as "ideaguy83" says, I can't stand the syrupy taste of the "original" drinks anymore. Also, as "danielb" says, "Water, water, water . . ." is the best course for both cutting back calories and carbs, and as an avid bicycle racer and long distance runner, I can guarantee you that water is the one single liquid that will quench your thirst faster than anything else, bar none! If you want caffeine, as I do, then you can work that in through your diet drinks, or a good cup of coffee, or two or three, etc.. At this time of year you want to make sure you drink enough water just to keep safe. I drink a LOT of iced tea with splenda for sweetener, AND a good dose of REAL lemon and lime, as opposed to the artificial stuff, to "spice it up". The transition may be tough, as I explicitly told my doctor at my next visit. I will also add that in that time period I lost 25 pounds and dropped my triglycerides by 75% and my cholesterol down to below the "bad" range. Oh, and my doctor told me that triglycerides convert into cholesterol when not used up or lessened, so since carbs / sugars are where triglycerides come from, and triglycerides are one source of cholesterol, you'll have an added incentive, maybe, to switch to sugar free drinks. I did it, and that was a humongous accomplishment. You can do it too, no matter how bad it feels. God Bless you.