Obesity inversely correlated with European ancestry among African Americans

It is well known that different ethnic groups vary when it comes to diseases such as Type II Diabetes. Or, more specifically they vary in terms of risk, all things equal (if you use an online Type II Diabetes calculator you'll see immediately as they sometimes have a parameter for ethnicity). American blacks for example are heavier than American whites. This seems to be true even when you control for socioeconomic status (though as Oprah once said, "You don't need to do a 'study' to figure that out"). There has been research on genetic loci correlating to obesity in European populations before, but there is now a new one which looks at African Americans, and tries to ascertain whether some of the loci might be unique to them because of their racial ancestry. Admixture Mapping of 15,280 African Americans Identifies Obesity Susceptibility Loci on Chromosomes 5 and X: