Didn't notice this thread the first time around - I still have some problems with dry flakey skin and itching on my scalp, but never related it to food dye, as I buy mostly organically grown food - but I still could reduce some of the sweets . I will try this.
I managed to cure my scalp problems by avoiding soap and shampoos and substituted them with rhassoul - there are other distributors, I suppose, just linked the first one I found. It's a brand of clay traditionally used for skin and hair care in Morocco - your skin will feel like silk afterwards. But you have to prepare it immediately before use - it loses it's capacity for absorption pretty fast after contact with water. Ready for use brands in tubes have to add essential oils for conservation, which might irritate the skin.
Might look unusual at first, but it works just fine for body care.