Very low vitamin D levels in the Saudi population apparently.
http://www.arabnews.com/news/519761
The Saudis live at night. They sleep a lot during the day and go out shopping etc at night. To avoid the heat. So that might at least partially account for the Vit D levels.
I usually have low Vit D, sometimes extremely low. I also have Type 1 since I was 5 and hypothyroidism since I was 13. My sister got Type 1 at 33. My skinny Dad and skinny aunty both got Type 2 in their sixties.
So I think there's an autoimmune element and a genetic element but it needs a trigger. In my family those of us with these conditions also had severe viral infections in the months before diagnosis.
The 'lifestyle' change we have seen in the last century or so might not be good or chemicals, etc. It might just be urbanization and greater social mobility, possibly patterns of working which carry more men and women into a common work place (instead of people working in the home or in very small groups). That would allow the spread of non-fatal viruses that trigger genetic tendencies.
A case like this is schizophrenia. It is known that viral infections in pregnancy increase the child's risk of been diagnosed with it in his/her late teens/early twenties. But it also has a genetic base (and occurs in the same families as Type 2).
So, going back to Vit D, it might be a causative factor, or it might just be something that co-occurs with Type 1. Maybe some of us simply have a faulty system that makes it hard for us to process or produce it. Hard to know. I have no signs of osteoporosis, interestingly.
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