I think as well, that it depends on the child as to which additives etc set them off the most so it be trial and error till you work out which ones are the worst for your child.:
I haven't noticed it much with DD yet, although I'm quite careful with what she can and can't have. Although, for ease of use, I've been buying Heinz little kids range of snacks - they do things like muesli bars, and fruit and bran bars, and they seem ok for her - I've got a feeling that they're promoted as no additives/preservatives. I also remember a dietician saying that food for infants is quite heavily regulated so they can't put too much of the bad stuff in.
