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Two types of sugar substitutes are available:
Andra Picincu wroteNon-caloric sweeteners: aspartame (NutraSweet, Equal), saccharin (Sweet'N Low, Sweet Twin, Necta Sweet), acesulfame K (Sunett and Sweet One), neotame (not yet marketed under a brand name), and sucrose (Splenda).

Reduced-calorie sweeteners
: sorbitol, mannitol, lactitiol, maltitol, xylitol, isomalt, erythritol, and hydrogenated starch hydrolysates.
http://www.digitaljournal.com/blog/1374

Also, check this out: The Messy Explosive Side Effects of Sugar-Free Gum
aspartame is the one used in diet pepsi/coke, and it's believed to be cancerous and can in some cases also cause asthma.
hmm... u study this kinda stuff when u are in seconde , no ?
dunno but ever since they changed the sugar-free ingredients, i have totally stopped drinking that stuff. currently i drink only club sodas. whenever i drink a diet peps/coke its like someone ha poured a ton of concrete into my head and my brain cant function for several hours. its the kinda feeling where you wonder whether you can spell out the alphabet and count 1+1

so simply anything that is not organic, stay away from it.
I always wondered what will happen if you swallow a bunch of mentos then drink a glass of coke... lol
2 years later
It is better to use the sweeteners that only reduced-calorie. We also need a little calorie to eat to have a supply of energy. The non-calorie is not always good for us, it is just good for those who already eaten their calorie needs in that day.
"Normal" people are so mis-informed on this subject. Gladly, I managed to stop drinking any sorts of Pepsi/Coke/Soda or anything of the like.