I came across this: Vitamin D unlocks racial differences in blood pressure
The researchers found that, overall, Blacks had significantly lower levels of vitamin D in their blood than Whites and blood levels of vitamin D were linked to systolic blood pressure. Differences in vitamin D levels between Blacks and Whites accounted for a quarter of the difference in blood pressure readings between the two groups. When the researchers excluded participants on blood pressure medication, the effect of vitamin D explained 40 percent of the difference in blood pressure.
As far as more factors contributing to this I have noticed that in the Manayunk area, you have many nice restaurants to eat at and also 2 pizza places that serve vegan pizza and a steak sandwich place with tofu and seitan fake-cheese steaks but no fast food places. Whereas around Germantown and Chelton with many more people of color you have lots of fast food places with really greasy fries.
I found the above site since the New York Times blog article that I was reading had a link to it. Jane Brody wrote a book on nutrition a few decades ago.
Jane Brody on Vitamin D - NYTimes.com
Once McDonalds announced that they were going to switch to a healthier oil for fries and an employee told me that they would not since people like the greasy fries. I wondered how this employee could disagree with the corporate office. But it turned out that she was right. I was reading a comment on this blog and someone left this:
Vitamin D Can Ease Menstrual Cramps
Vitamin D is a steroid hormone. Here is California's premier endocrinologist, Joe Prendergast M.D. talking about the many things that vitamin D can do. He says that it increases the immune system from 3-5 times.
Would you belive that Donald Trump is now fighting cancer with vitamin D?