What you see in kaleh is what happens when for decades there is no father figure in the home.
Decades of fatherless children brought up by their grandmothers ( you will notice they are always brought up by their grandmothers, their mothers are nowhere to be seen).
The African American or even Afro-Caribbean have almost been bred to be physically stronger due several hundred years of slavery.
If you think about it, only the strongest and most resilient survived those slave ships across the Atlantic.
The hard physical work on those plantations have meant that they have passed down those genes through the generations.
The African origin black people in the Americans are also no longer pure black African. There is plenty of European slave master blood in them after the slave women were taken and raped by their slave masters. This is the reason why they come in all shades of colour.
You can tell the difference between black people of Africa and those from the Caribbean particularly in the UK.
The diet that developed amongst the black communities of the Americas is based on the quality of food from the slave days. It was also foods not desired by the whites or food that was cheap like Chicken.
Ironically, like us folk from South Asia, the Afro Caribbeans and African Americans also suffer from high rates of diabetes and high blood pressure.
The overlooked or sometimes conveniently ignored aspect of their physiology is their diet, i.e. chicken and meat in general. I'm not being funny or stereotyping, but black people LOVE their chicken. Obviously, inhaling chicken all day and sitting on your behind playing video games is going to cause obesity in everyone, black or not, but certain foods coupled with an active lifestyle and perhaps a genetic predisposition to building and retaining muscle better than other races, also plays a factor. Testosterone (in natural) animal products is key. As a lifelong vegetarian I'm content and secure enough in my beliefs to acknowledge this truth.