I don't know why your other thread got deleted....as I was attempting to answer your post to me...so I started this one with it...
Unfortunately there is a rapid growth in tobacco use in African countries (and what will follow sadly..will be the same health problems found in the West).. Obesity rates among Africans are relatively low in some areas, but they are climbing like the rest of the world....due to the increase in development..We have become less physically active...<quoted text>
The risks tend to cascade. Smoking constricts the vessels. Bad diet and obesity is a major risk factor, and obesity can lead to immunity problems, and diabetes. Diabetes damages vessels and leads to heart disease and stroke risk.
And health research has been in a double bind. If they experiment on Black subjects, there are accusations of racism, attempted genocide, etc., but if they don't and BP get medicine that is more effective on WP, since that is the only study group tested, then the doctors, government, hospitals,etc., get blamed for being racist. But in recent years, there have been Black-only study groups, and different medications were found. So the fear of being labeled as racist actually hindered valuable research.
I got on the vitamin D kick sometime back. I got to thinking about why there is a difference in various diseases between race and gender, and that vitamin became the unifying factor. For instance, boys are more likely to be autistic than girls, or at least get it worse. Then I discovered that females are better at conserving vitamin D (good quality to have during pregnancy). And with blood pressure and heart disease, BP tend to have more problems there in America (but not in Africa according to a couple publications). So I was thinking, what do BP get in Africa rather than here? That led to thinking about a more direct sun (equator) and housing that is not up to our standards. So that would affect vitamin D levels.
As far as African American intake of vitamin D via the sun, they have as much access as other Americans; so i'm not sure why they would need to be in Africa for that <shrugs>..
There is trouble in absorption......the claim is that dark pigment blocks light which will reduce the effectiveness of vitamin D via the sun for dark skinned people.....With that knowledge..when speaking of Africans "in this regard"...the publications you read may have been of "lighter" Africans perhaps?...
Where the insufficiency probably comes into play (one of the reasons) is the access to quality "assistances" .in the area of food & medical treatment (mainly preventive care)..
*Speaking of Africa....in my home country (Seychelles)..our main delicacy is fish...and fatty fish is a very good source of vitamin D..