there is something to it. East Africans really often are very skinny and pretty ugly, especially people from Ethiopia and Somalia.
I have been in Kenya and Zambia, and must say, Zambia is a secret tip: People are so gentle, not as pushy as in Kenya, and pretty goodlooking, and honest and natural... Probably because there is not so much tourism as is in Kenya, they are more like themselves.
Never been in Nigeria, but heard a lot of bad things about it. Go Zambia!