Many Ashkenazi Jewish diseases associated with low vitamin D or poor Vit D genes

Increased Jewish Risk of Pancreatic Cancer

Note: all of the above diseases are at increased risk if low Vitamin D and/or poor Vitamin D genes

Speculation by the founder of VitaminDWiki

Ashkenazi Jews may need more vitamin D, |Omega-3, Magnesium, Resveratrol, Boron, Zinc, etc. than others

Wikipedia has a section on Ashkenazi diseases

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