Squatting Theory
Not to be rude, but I think the squatting theory is ludicrous.
The Western diet tends to be overloaded with white flour, which completely clogs the system.
Add to that sugar, which creates bacterial imbalances, and the consumption of various other toxic non-foods, chemicals and preservatives, and the body is overloaded with junk and eventually cannot function normally.
Whites in South Africa and America are often more affluent and thus tend to eat more wholesome foods, whereas those on lower incomes tend to consume white flour, sugar and junk food in greater quantities.