Comment by ipython
What can the actual experts tell me about my child's reaction to the food dye? One of my children has an adverse reaction to the dyes, my other children do not. What is the expert going to tell me? How does one get access to one of these experts? What about the studies that do show a link between behavior issues and artificial dyes? Are those studies not to be trusted?
Edit: curious about your first sentence: what makes you against unnecessary food additives? Is it a double blind study? If so, can you name it or an expert opinion on the matter that you trust?
Lots of parents probably follow similar lines of thinking about the effect of sugar on their kids' behaviour, and I think it's worth deferring to experts on that.