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> That not a lot of Africans are obese

I don't think that's accurate. Eye-balling this[0], northern African and South African women are more obese than most European and US countries, and although men seem less obese, when you look at it overall, over 50-60% of adult South Africans and northern Africans are overweight or obese, compated to 75% of Americans. Obviously cherry-picking a bit here and ignoring western and most of sub-Saharan Africa, but I don't think "not a lot of Africans are obese" stands up as an assumption.

[0] https://data.worldobesity.org/rankings/?age=a&sex=f

There are several factors, higher Vitamin D levels because of time spent outdoors, median age of the population, co-morbidities including diabetes, levels and availability of testing and gathering data etc. etc.

likely much more to do with

1. poor testing

2. much younger skewing population compared to any other continent.