I looked into this a while back and think it's been pretty well established that most autoimmune conditions are increasing significantly in the developed world and no cause is established.
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Reading other (newspaper) articles it would seem that more blame is now being heaped on ultra-processed foods and there's a growing awareness that a healthy gut microbiome is key to good health. However, looking at other shoppers' trolley contents in the supermarket I can see that for the majority, these revelations are totally off their radar - little wonder we're getting problems!
It might just be mutational load due to people having kids much older.