[aileen]

Well, I have read this in one of Yahoo articles:

Both ordinary and Diet Coke will do the following:
-weaken teeth due to the leaching effect of the carbon dioxide fizz on the minerals in the enamel, the acid in the flavouring, and the sweeteners;
-increase likelihood of stomach ulcers and digestion problems;
-encourage caffeine dependency and not give you sufficient liquid intake - any caffeinated drinks you consume should be offset by a glass of water to avoid mild dehydration.

Contains Sweetex, Nutrasweet and Acesculfame K. These sweeteners are all mild neurotoxins, which means that in large quantities in certain people they can affect the brain and nervous system leading to MS- or Parkinson's-like symptoms including tingling, shaking and reduced vision. These effects nearly always diminish when the sweetener is removed from the diet.

Good for me cause I don't drink too much sodas. I'd prefer fruit juices instead.