are auto-immune disorders due mainly to diet ?
My eczema was~ totally caused by grains. As long as I don't eat them, I don't have eczema.
I wouldn't go so far as to say diet causes auto-immune disorders, period. It seems to be a complicated relationship between genetics, including mere pre-dispositions, and environment. If two unrelated people eat the exact same diet, they won't necessarily fair the same on it.
Certain foods can aggravate my auto-immune issues, but so can lots of non-food things.