So says regular commenter Peter. He wrote:
If you compare a black person and a white person of equal age, height and weight, the black person will have more muscle mass and less fat that the white person. Any doubts? Consider these three words: National Football League. And while this difference is more pronounced among males, it exists among females too. It is possible, therefore, that the typical 166-pound black woman has no more body fat than the typical 149-pound white woman, and as a result is at no higher risk for obesity-related health complications.
In another comment, Peter cited a Steve Sailer blog post on the topic.
I have no doubt that black women do indeed have more muscle, on average, than white woman, a fact easily observed by riding the subway in the summer months. But does the average black woman have 17 pounds more muscle than the typical white woman as Peter suggests? That's doubtful. I would guess that about half the weight difference is fat.
Peter then made a dubious leap of faith in assuming that because of the extra muscle, black women have "no higher risk for obesity-related health complications."
First of all, the research is fuzzy on whether a little extra weight is bad for you, or maybe even it's good for you. The research on whether muscle is good for you is non-existent as far as I know. None of the large scale studies that I've read about have attempted to categorize people's weight into muscle weight vs. fat and bone weight. For whatever reasons carrying extra fat weight leads to various diseases, it's not clear that carrying around extra muscle weight wouldn't also contribute.
Because muscles are currently fashionable, even on women (check out Madonna's muscles), Peter is assuming that what's fashionable must therefore be healthy. Not true. Cigars became recently fashionable, but that doesn't make them any more healthy.
If muscles were so good for us, then we would have evolved into super-muscled hulks. Muscles, obviously beneficial for men competing with each other for women, must come with some other less obvious but nevertheless detrimental effect.
A Harvard study of American life expectancy showed that Asian Americans had the highest life expectancy and black Americans the lowest life expectancy. Blacks tend to be more muscular than whites and Asians less so (a fact which doesn't help Asian men much in the American dating market), but the race with the least muscle has the highest life expectancy.