Ever looked up how Aspartame is made? Or should I say "cultivated?" It's an artificial chemical sweetener and it's actually manufactured using bacterial cultures of E.Coli. (Go ahead, look it up!) It's three components are Methanol (wood alcohol,) Phenalylanine (isolated amino acid) and Aspartic acid (another isolated amino acid.)
There are tons of sources refuting this crap, and I have no idea why the FDA allows it to be in tons of products. But then again, the FDA is now saying Melamine is okay for babies and Mercury is GOOD for your brain! It is worthwhile to note that Donald Rumsfeld (former Secretary of Defense for the USA) was the president of the company Searle that created Aspartame. He pushed to have it put out in thousands of "low calorie" or "light" food products.
I would strongly encourage doing your own research on these subjects because you're not going to get the truth from the big corperations.