I have many friends who are die-hard diet-food consumers. That includes diet pop (or soda, depending on where you live) and sugar-free foods.
I am more of a natural sugar (table sugar) kind of gal. My view point on sugar is that my body knows how to process regular sugar, plus we don't use it too often. All of the sweeteners that have zero calories scare me. How can it have zero or nearly zero calories? What does your body do with the chemicals? How does your body process them?
Anyhow, I found this very helpful in the great sugar debate.