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By Annie B. Bond
Birthday cakes with all the colors of the rainbow were the touchpoint that would change our friendly and gentle daughter into a belligerent crank puss for a few hours after eating her slice. We always braced for the aftermath of the birthday parties. Given that we didn't serve meals with FD&C food dyes at home, it wasn't too hard to track down the cause of her dramatic behavior changes as they only happened under isolated circumstances.