Hi MM
As someone else mentioned, you should check out Sue Dengate's website. If you google 'fed up with food additives' you will find her website. Give yourself a bit of time to browse through it though, because there is alot of really suprising information on there.

With my girls, i try to steer clear of preservative 282 - usually found in bread - and also most colours - especially 110. On the website you will find a print out of all the nasty additives etc.

There are some children who aren't affected by these additives etc, but if you are having behavioural issues, then it's worth a look. I need to get back on track with the foods i'm giving Hannah. (i can't blame teething forever )