Cyrus, I'm not a doctor and could be wrong about high-blood pressure--but I'm NOT WRONG about sickle-cell anemia:
"sickle cell anemia...
...
hereditary disease that destroys red blood cells by causing them to take on a rigid “sickle” shape....
Sickle cell anemia occurs mainly in persons of African descent. The disease also occurs in persons of the Middle East, the Mediterranean, and India...
...
An estimated 1 in 12 blacks worldwide carries the sickle cell trait, while about 1 in 400 has sickle cell anemia."
http://www.britannica.com/Blackhisto...KeyValue=67625
Moreover, despite your denial, Asians DO tend to have yellower skin than others--and blacks tend to have browner skin than others, as well as kinkier hair. This is NOT controversial (except maybe to people so steeped in political correctness that they deny plain facts which make them uncomfortable).
If you want to claim that "race" doesn't exist, well technically that may be the case, but you cannot deny that the groups at least casually referred to as "race" DO have some special physical characteristics on average that set them apart. Moreover, those characteristics tend to be passed on genetically; moreover, not all such physical characteristics are equal.