If I may, Id like to comment on this 9½ year old (until yesterday) thread. I'm not a food chemist, or expert, so this is just my opinion.
I don't use artificial sweeteners. Not because of any health concerns, but because they don't taste good to me. I just can't abide 'em. lol. However, I'm very fond of Truvia. This is not an artificial sweetener, it's an "alternative" sweetener. Yes, it's a processed product, but to one extent or another, so is sugar, agave nectar, molasses, etc. I can't stand any other stevia product, too bitter. But Truvia solves that problem. They extract only the palatable part of the steeped stevia leaves. Then blend with some sugar alcohols (which are also "natural"). The result being a processed, but not artificial sweetener.
Walmart sells a similar, generic product with the same taste, as far as I can tell. But, I don't like it because it's a very fine powder. When you pour it, you get that floating powder taste in your nose. Truvia has crystals about the same size as sugar.
best regards, larry mac