I've been reading websites from people that claim that their is a danger linked to Aspartame. When I read something written by a doctor or a REAL health official they say there is no evidence linked to danger. Thus, these websites and articles are just speculation. Here is an example of a bad website and a good website.

Bad website: http://www.sweetpoison.com/aspartame-information.html
Look at this "Medical professional". I quoted because I am being sarcastic. I was a little confused when I saw she had a PHD, but then I saw the title of the website "Sweet Poison" and that she is trying to make money off of a book she wrote. If she was an MD who really wanted to warn people about Aspartame, then it would be done as a grant -> study which she would not make money off of it at all.

Good website: http://www.mayoclinic.com/health/phenylalanine/AN01552
[The website is .com but it is written by a registered dieticion]

Everyone please do me a favor, don't eat harmful high-fructose corn syrup which has many studies talking about how it is linked to obesity and is truly bad for you. Exercise, drink diet soda and eat aspartame products and get to your desired weight the safe way.
There is one thing you should always do when reading anything on the internet. See if the website is .edu or .gov . That is a simple way to tell if these websites are real or just anyone out there being experts on anything.