Regarding aspartame, splenda, and the internet,
On the one hand, it is healthy to view the official line with a bit of skepticism. There is nothing wrong with wanting to know what it is that we are putting in ourselves,
really.
On the other hand, with the millions and
billions and billions of doses of this stuff being consumed, don't you think that truly widespread adverse effects would be obvious? Most of the articles on "aspartame pain" referenced a doctor's letter written in 1991 ("JOINT PAIN ASSOCIATED WITH ASPARTAME USE By H. J. Roberts, M.D. West Palm Beach, Florida from the Townsend Letter for Doctors May 1991"), which gave an account of 551 instances of interviews and survey results, with 391 respondents reporting adverse side effects, and 58 reporting severe joint pain that subsided after avoiding aspartame-containing products; hardly a scientifically valid study, with no controls in place for other factors (could the only aspartame containing product be Diet Pepsi, and could the reaction be to the coloring?) , no controls for suggestive questioning, no controls in for environment or other factors possibly causing the pain. This is contrasted with years and years of clinical studies confirming the general safety of the product. In fact, aspartame is the most scrutinized product in the history of food additives. I refer you to
this summary of the situation.
Which isn't to say that you, as an individual, shouldn't make the decision that is right for you. If you feel uncomfortable consuming these products, then don't. If you believe aspartame gives you a headache, and you don't get headaches when you don't consume aspartame, well, it's obvious; avoid aspartame.
But at the same time, realize that just as there are people profiting from the sale of aspartame, there are people profiting from promoting its controversiality. It's just a matter of scope.
Regarding stevia: although I haven't tried it, my opinion is that if it were safe, someone would already be profiting from it. "...[D]ue to studies on rats and hamsters showing that large doses of stevioside, the active ingredient in stevia, caused low sperm counts and abnormally small offspring, you'll probably never see it approved from the FDA or Health Canada, the European Union, or the World Health Organization."
I'm a Splenda guy, myself. In general I avoid soft drinks in favor of water, using Splenda in my coffee or tea. I actually prefer Splenda to sugar! I haven't noticed the Splenda effect mentioned above; I'll look for it.