You would have to consume huge quantities for it to be a hazard to your health, and it is easily avoided. Don't use artificial sweeteners such as Candarel and Nutrasweet, don't eat sugar free sweets, chewing gum or low calorie ready made puddings, don't drink diet pops.
Read the label.
I also had to put my kids on an aspertame free diet when they both suffered badly from childhood asthma.Theres another one but I cant spell it so shall come back with it.
Its phenylananine -which has a link with aspartame.I used E for additives as my bible and it worked wonders with my 2 kids.Boots the Chemist are a good source of those particular free products especially for children -but nothing beats fresh of course altho not always pracical.