Aspartame could kill?
http://www.relfe.com/Aspartame_92.html - Lists symptoms caused by common
'light' sugar aspartame. Among others, these include seizures and tumors in
lab animals. Methanol is gradually released in the small intestine when the
methyl group of aspartame encounter the enzyme chymotrypsin.  That means that
aspartame degrades partially into methanol (wood alcohol) inside the body. 

Methanol breaks down into formic acid and formaldehyde in the body.
Formaldehyde is a deadly neurotoxin. An EPA assessment of methanol states that
methanol "is considered a cumulative poison due to the low rate of excretion
once it is absorbed.