These E numbers have been proven to cause cancer:

E 142

E 132

E 210

E 211

E 212, 213, 214, 215, 216, 217

E 239

E 330

Other E numbers are classified as "suspicious".

Using cheap soya sauce causes a condition called Chinese Restaurant Syndrome. I've had it and it is signified by a yukky headache.

Others cause intestinal disorders.

Check out the link to see which ones do what. Better yet, don't eat anything with these contaminants in them.