Today, the New York Times reports that the US Food & Drug Administration (FDA), which "concluded long ago that there was no definitive link betwen the colorings and behavior or health problems," has agreed to ask a "panel of experts to review the evidence and advise on possible policy changes, which could include warning labels on food." Excerpt [emphases ours]:
In a concluding report, staff scientists from the F.D.A. wrote that while typical children might be unaffected by the dyes, those with behavioral disorders might have their conditions “exacerbated by exposure to a number of substances in food, including, but not limited to, synthetic color additives.”...
But Dr. Lawrence Diller, a behavioral pediatrician in Walnut Creek, Calif., said evidence that diet plays a significant role in most childhood behavioral disorders was minimal to nonexistent. “These are urban legends that won’t die,” Dr. Diller said.
The Times article referenced a 2007 study, published in the British medical journal, The Lancet, which "undertook a randomised, double-blinded, placebo-controlled, crossover trial to test whether intake of artifical food colour and additives (AFCA) affected childhod behaviour." The conclusions: "Artificial colours or a sodium benzoate preservative (or both) in the diet result in increased hyperactivity in 3-year-old and 8/9-year-old children in the general population."